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AviSynth is a powerful tool for video post-production. It provides ways of editing and processing videos. AviSynth works as a frameserver, providing instant editing without the need for temporary files. AviSynth itself does not provide a graphical user interface (GUI), but instead relies on a script system that allows advanced non-linear editing. While this may at first seem tedious and unintuitive, it is remarkably powerful and is a very good way to manage projects in a precise, consistent, and reproducible manner. Make scripts with AvsPMod, it is a text editor for AviSynth.

Free software
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Version:2.5.8 / 2.6.0 Alpha 5 History
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Size:4MB



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  Latest version:
2.5.8 / 2.6.0 Alpha 5 (September 18, 2013)


Download sites:
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Download Avisynth 2.5.8 (direct link) (4MB)


More download options:
Download Avisynth 2.6.0 Alpha 5 (direct link)



Download Avisynth old versions


Supported operating systems:
Windows


More information and other downloads:
Download Avisynth+ here.

Download Avisynth 2.6 MT here.

Download Avisynth 2.5.8 x64 MT here.


Sections/Browse similar tools:
Video Editors (Advanced/NLE)Video Frameservers

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Version history / Release notes / Changelog:
Changes from 2.5.8

Additions
=========
* Added Eval(clip, string name, string) alias for oop processing of argument.
* DirectShowSource support non-standard pixel types "YV24" and "YV16".
* Info: Audio only clip now creates its own canvas video.
* AviSource: Include packed/padded processing and -ve biHeight logic for compressed input.
* Add Script Functions :- BitLRotate, BitRRotate, BitChange, BitClear, BitSet, BitTest and their asm aliases.
* Add WeaveRows (blit cost) and WeaveColumns (slow) frame combining filters.
* Add AudioDuration() [as float seconds], IsY8(), IsYV411() & PixelType() [as a string] script functions.
* Add Echo and Preroll filters.
* Add IScriptEnvironment::GetAVSLinkage() and DLLExport AVS_linkage for host usage of avisynth.dll.
* DirectShowSource, 2.6 plugin, support pixel types "AYUV" as YV24, "Y41P" and "Y411" as YV411.
* AviSource: Add Full and Auto pseudo pixel_types. Full is all supported. Auto is YV12, YUY2, RGB32, RGB24 & Y8.
* Add "AudioLengthS" [as a string], "Ord" & "FillStr" script functions.
* Add AudioTrim(clip, float, float) audio priority trimming, args in fractional seconds.
* Add Trim(M, Length=N[, Pad=False]) and Trim(M, End=N[, Pad=False]) function overloads for explicit Trimming. Length=0 means zero frame clip. End=0 means end at frame 0.
* Add SeparateRows (zero cost) and SeparateColumns (slow) frame slashing filters.
* Add Script Functions :- Acos, Asin, Atan, Atan2, Cosh, Sinh, Tanh, Fmod, Log10, BitLShift, BitRShiftS, BitRShiftU and Hex.
* Add "ConditionalSelect","csc+[show]b" runtime filter.
* Add dither option to Levels, RGBAdjust & Tweak.
* Add BitAnd(), BitNot(), BitOr() & BitXor() script functions.
* Add StrCmp() & StrCmpI() script functions.
* Add YV24 support for Limiter show option.
* Add "Global OPT_dwChannelMask={int}"
* Add 0x0063F speaker mask for 7.1 WAVE_FORMAT_EXTENSIBLE.
* Add .dll DelayLoad exception texts to crash message formatter.
* ImageWriter, add support for printf formating of filename string, default is ("%06d.%s", n, ext);
* Add avs_get_error(AVS_ScriptEnvironment*); to avisynth_c interface.
* Catch and save AvisynthError text in more avisynth_c entry points, for kemuri-_9.
* Add ScriptName(), ScriptFile(), ScriptDir() functions (WarpEnterprises).
* Add SkewRows filter.
* Histogram, Levels mode, Improve colour of chroma legends.
* ConditionalFilter, teach about string results.
* Add some more "Add/Remove Software" registry keys to the Installer (XhmikosR).
* AviSource: Support both packed and DWORD padded raw planar input like with DSS.
* Add IScriptEnvironment::ApplyMessage()
* Add ImageSourceAnim (Wilbert)
* Support user upgrade to 178 DevIL.dll (They need to manage CRT dependancies).
* ImageSource: palette and compressed bmp images load correctly now (issue 894702) [need 178 DevIL.dll]
* ImageSource: support for other formats like: gif, exr, jp2, psd, hdr [need 178 DevIL.dll]
* Add YV24 mode to ColorBars.
* Add ColorBarsHD based on arib_std_b28.
* C-api usability enhancements from kemuri9 [Work in progress!]
* Add Undefined(), AudioLengthLo(), AudioLengthHi(), IsYV16() & IsYV24() script functions
* Allow newlines (and hence comments) before '{' -- Gavino
* Added IScriptEnvironment::DeleteScriptEnvironment()
* Added Histogram, population clamp % factor for "Levels" mode,
* Histogram, revert "Stereo" mode to YV12, Add "StereoY8" mode,
* AviSource: Support fourcc "GREY" as Y8
* Added support for argument passing and EAX return value to SoftwireHelper.
* Added "Global OPT_VDubPlanarHack=True" to flip YV24 and YV16 chroma planes for old VDub's.
* Added "Global OPT_AVIPadScanlines=True" option for DWORD aligned planar padding
* Added Matrix="AVERAGE" mode.
* Added ContinuedDenominator/ContinuedNumerator(f[]i[limit]i) script functions.
* Tweak: fix MaskPointResizing + put back Dividee ISSE code (use sse=true).
* Added ChromaInPlacement, ChromaOutPlacement and ChromaResample options to planar colour conversions.
* Added MaskHS.
* Source tweaks to get ready for VC8.
* Add Y8 for DevIL, planarize EBMP.
* Planar support for many filters.
* Added Info() time indicator on audio length and video (current frame & total). (2.5.8)
* Added UtoY8 and VtoY8.
* Added more info to Info(). (2.5.8)
* ColorYUV: Added all adjustment parameters as conditional variables "coloryuv_SETTING". Enable by setting conditional=true.
* ConditionalReader: Added support for type String.
* ConditionalReader: Added offset keyword to offset all frame numbers after the keyword.
* Added SincResize() with optional taps parameter (default is 4).
* Added Custom band setting to SuperEQ to allow all 16 bands to be set from script. Usage: SuperEQ(clip,band1, band2, band3....) values are dB in float.
* Added fast 0-1-0 kernel for YV24 to ConvertBacktoYUY2().
* Added core formats: YV24, YV16, Y8, YV411.

Bugfixes
========
* Fixed frame range clamping in ComparePlane (ultim).
* Fixed posible leak with realloc in ConditionalReader (ultim).
* Fixed posible double free in text-overlay (ultim).
* Fixed RGB32 to Y8 pixel right shift from 4th pixel on (Robert Martens).
* Fixed Overlay YV24 Image444 leak.
* Fixed AVISource "AUTO" and "FULL" handling.
* Fixed ImageSource handling of missing ebmp files.
* Fixed DirectShowSource incorrect byte order for unpacking of pixel type "AYUV".
* Fixed HexValue parsing values greater than 7FFFFFFF, now as unsigned hex.
* Fixed ConditionalReader memory overrun parsing bools.
* Fixed ResampleAudio NOP test to compare vi.num_audio_samples, not sample rate.
* Fixed YV24 -> RGB24 overrun cleanup for widths%16 == 5.
* Fixed RGB24 AddBorders with right=0.
* Fixed conditional_functions error message names (Wilbert).
* Fixed Audio cache ac_expected_next regression.
* Fixed ImageSource deal with add 1 to IL_NUM_IMAGES bug (Wilbert)
* Fixed Overlay YV24 V plane conversion.
* Fixed Overlay YV24 mode with shared input clip, needed a MakeWritable.
* Fixed ImageReader upside down TIFF in 178 DevIL. (Wilbert)
* Fixed string+string bug when total length is 4096*K-1.
* Fixed SincResize misuse of "int abs(int)" (Gavino). Fix Lanczos and Blackman sinc use of float == 0.0, use small limit "> 0.000001".
* Fixed Classic mode legend drawing for planar right limit and yuy2 centre line.
* Fixed possible MT race. Use "env->ManageCache(MC_IncVFBRefcount, ...)" in ProtectVFB.
* Fixed SwapYToUV output image size bug for 3 clip case.
* Fixed Crop limit tests for RGB.
* Fixed Overlay yellow tint on rec601 RGB import conversion.
* Fixed YtoUV() output image size bug for 3 clip case.
* Fixed ConvertToPlanar chroma alignment.
* Fixed Levels (RGB) change use of PixelClip(x) to min(max(x, 0), 255).
* Fixed SwapYtoUV yuy2 crash (StainlessS).
* Fixed Overlay saturate UV in add and subtract mode.
* Fixed Info.h range protect display characters (StainlessS).
* Fixed AviSource packed planar import chroma offsets.
* Fixed AviSource NULL GetWritePtr() failure due to premature setting of last_frame.
* Fixed Mask rounding in greyscale calcs (Wilbert), minor refactor.
* Fixed SelectRangeEvery audio snafu (Gavino).
* Fixed LoadPlugin, SaveString of result string.
* Fixed LoadPlugin, use _vsnprintf.
* Fixed LoadVirtualdubPlugin, don't add vdub filter to chain on load failure.
* Fixed rounding in RGB HResize (JoshyD) (affects all resizers)
* Fixed error message name in the filter VerticalReduceBy2
* Fixed SeparateFields() with variable parity input clip (Wilbert)
* Fixed AviSource, cannot cast__int64* to long*, it does not work!
* Fixed ConditionalReader: Don't allow out of range "Range" to overwrite edge values
* Fixed MonoToStereo with stereo sources.
* Fixed MergeChannels with only 1 input clip.
* Fixed AviSource support for negative height DIB format AVI's.
* Fixed Audio cache crashes.
* Fixed resize with YV411, missing code.
* Fixed ConditionalReader rounding with integer interpolation.
* Fixed Softwire SSE2 bugs.
* Fixed SSSE3 CPU detection.
* Fixed SSSE3, SSE4.1 & SSE4.2 detection.
* Fixed Fastwire encoding of instructions that are >2 opcodes (SSSE3+4).
* Fixed _RPT5() macro for debug builds

Optimizations
=============

* Cache auto increase span on sparse misses.
* Cache prevent inactive instances returning VFB early and spoiling active instances hit rate (LaTo).
* ConvertToPlanarGeneric explicit add Cache before chroma rescaler.
* Overlay minor refactor YV12 -> 444 chroma
* Speedup ConvertToMono(), minor refactor MixAudio().
* Change StackVertical/Horizontal to interative instead of recursive, 2^N performace increase for 3 and more clips, i.e. 1 blit total instead of blit(blit(blit(...
* RGBtoY8 Dynamic ASM code, support for RGB24.
* YV24backtoYUY2 Dynamic ASM code.
* UtoY8, VtoY8 abuse subframe, zero cost.
* YV24<->RGB Add SSE2 and SSSE3 code paths, get rid of wide_enough.
* ConvertToYUY2 Add SSE2, MMX restore full speed on platforms with poor ooox.
* ConvertAudio, manage tempbuffer and floatbuffer independantly.
* ConvertAudio, prefer SSE2 over 3DNow for super AMD cores.
* Info.h, full refactor, a good example of "Never look down", thx StainlessS
* DoubleWeaveFrames, If A not writable, try to write to B, else make new frame
* Histogram, fix GetFrame/NewVideoFrame call order
* HResizer, interleave code +4% faster
* YtoUV() Abuse Subframe to snatch the Y plane / UV planes, Derestrict destination colorformat autogeneration.
* ImageSource: Improve thread interlock code
* ConditionalReader/WriteFile: Full refactor.
* Replace _strdup with SaveString in AddFunction (Thanks Gavino)
* SuperEQ: Improve channel unpacking/packing code.
* H-Resize: Use SSE4.1 (movntdqa) loads for use once memory access.
* H-Resize: Added SSE2 horizontal unpacker.
* Resize: Use SSE3 (lddqu) loads for unaligned memory access.
* Added ultra fast vertical PointResizer (64 pixel/cycle).
* Added dynamic SSSE3 vertical resizer (16 pixel/cycle) ~ twice as fast as old MMX.
* Added dynamic SSE2 vertical resizer (16 pixel/cycle).
* Added dynamic MMX vertical resizer (8 pixel/cycle).
* Added SSSE3 version for RGB<->YV24 conversions.
* Added dynamic compiled MMX/iSSE for RGB<->YV24 conversions. Speed is approx 200% of C-code.

Changes
=======
* Import: Increase full path buffer to MAX_PATH*4 for multi char code pages like CP932 (Chikuzen).
* Throw error when output number of frames will exceed MAXINT.
* BlankClip: Supply useful defaults for new Audio/Video when using a Video/Audio only template clip.
* BlankClip: Use duration from Audio only template as default length for new clip.
* Bob: Retain parity sense of input clip.
* Define new IClip::SetCacheHints cachehint constants.
* Force int call arguments to user script function float params to be explicit floats.
* Splice pass CacheHints through to both children in + and ++ mode.
* WriteFileStart/End save current_frame and set Last.
* ConditionalReader do not ignore syntax errors in input file.
* ImageSourceAnim Pad/Crop images to match first frame (Wilbert)
* ImageSource Add version to messages (Wilbert)
* Initial 2.6 API entry point linkage.
* Use Invoke for graph tail, enhance non-clip output error reporting.
* PopContext when inner block Asserts/throws (maxxon).
* Remove duplicate definitions (Wilbert).
* Enhance non-clip output error reporting.
* Explicitly specify calling sequence as __cdecl for Avisynth softwire routines, (was the compiler default)
* Use env->Invoke("Cache", ...) everywhere instead of Cache::Create_Cache(), allows for Cache to be overloaded by a plugin.
* ConvertToYUY2 Change from 0-1-1 kernel to 1-2-1 kernel.
* Tweak make Interp same units as minSat and maxSat.
* Check HKEY_CURRENT_USER for PluginDir first. (henktiggelaar)
* Make forced, -ve, planar alignment of chroma planes match subsampling.
* Enforce planar alignment restrictions.
* C-api: Remove func sub-struct from AVS_Library struct
* Add error code to plugin load failure message
* Make default planar AVI output packed. Control with OPT_AVIPadScanlines=True.
* WriteFile() now supports unlimited number of unlimited strings. (was 16 by 254 byte strings).
* ConvertToRGB*, make C++ code sample chroma the same as the MMX code i.e. use both pixels.
* ConvertToRGB*, use YV24 path for planar, complain when options are present for YUY2.
* ConvertToYUY2, use YV16 path for planar, complain when options are present for RGB.
see: http://forum.doom9.org/showthread.php?p=1378381#post1378381
* Thread safe code, part 2.
* Correct IClip baked documentation
* Passify compilation error/warnings (XhmikosR)
* for, const, extern and ansi patches for VC2008 (SEt)
* Disable OPT_RELS_LOGGING option
* Change implicit Last parsing for argless, bracketless calls to match bracketed cases. (Gavino)
* DirectShowSource: Support last minute format renegotiation thru IPin::QueryAccept() & Validate the size of the provided directshow buffer.
* Remove non ascii chars from comments.
* Add core stubs for DirectShowSource, TCPServer & TCPSource, report when plugins are missing.
* Add note for original source downloads - SoundTouch
* Add more lineage history to Info()
* Move convertaudio, alignplanar, fillborder & MIN/MAX_INT definitions.
* Run AtExit before dismantling world.
* Change setcachehints definition from void to int. Test IClip version >= 5.
* Move PixelClip definition to avisynth.cpp
* SubTitle, etc, make X & Y options float (0.125 pixel granularity).
* ShowSMPTE() supports all integer FPS and multiplies of drop frame FPS.
* SubTitle, stop overwriting string constants (Gavino).
* SubTitle, improve pixel registration (Gavino).
* Make Info() CPU display hierarchical.
* Thread safe code, part 1.
* SoftwireHelper: explicit hardware exception handling.
* Resize: Moved GetResampleFunction into Resamplefuntion, to allow overrides.
* Resampler: Removed dead stlf code.
* Updated Soundtouch to 1.31 (2.5.8)
* Put dynamic matrix conversion into separate file.
* Moved chroma subsampling to image_type section.
* Added specific error reporting when requesting chromasubsampling with Y8.
* Split up merge and plane Swappers.
* Split up Plane transfers into separate classes.
* Added automatic destination colorspace detection on planar YtoUV.
* Took out greyscale and RGB32<->RGB24 from convert.cpp and placed them in separate files.
* All code assuming UVwidth = Ywidth/2 and similar should be gone.


Release Name: AviSynth 2.5.8

Notes:

This Release is the same as 2.5.8-RC5 [081227].

It has been repackaged for a last minute Russian Documentation catchup.

Changes:
(with respect to v2.57)

Additions:

* Added Czech doc translation.
* Added Polish doc translation by Slim, Krismen & Co.
* Added Japanese doc translation by niiyan.
* Added Installer standalone unpack option.
* Added Blankclip audio channels= and sample_type= arguments.
* ConvertAudio(cii) available to plugins via env->Invoke().
* Added font aspect, rotation and alpha to text routines.
* Added /* xxx */ block comments.
* Added [* [* xxx *] *] nestable block comments.
* SetMemoryMax(0) now just returns Memory Max value.
* Added planar YV12 color format to Compare().
* ColorKeyMask: Allow independant tolerance levels for each channel.
* Added Tweak Hue/Saturation range limiting.
* Added AudioLevels and Color2 modes to Histogram.
* Added WAVE_FORMAT_EXTENSIBLE audio output.
* Added ShowTime() script verb, like ShowSMPTE() but with milliseconds.
* Added BlackmanResize() and Spline64Resize().
* Modified DeleteFrame()/DuplicateFrame() to process multiple arguments.
* Added Min()/Max() script functions.

Bugfixes:

* Fixed Compare() graph pixel values exceeding YUV limits.
* Fixed AddBorders() args negative value clamping.
* Added workaround for HuffYUV, Xvid reading past end of input buffer.
* Fixed current_frame value in nested runtime script invocations (Gavino).
* Fixed Dissolve overlap arg range checking (gzarkadas).
* Fixed OpenDMLSource() multithreading race problem (QuaddiMM).
* Fixed unsaved variableName string in ConditionalReader.
* Fixed Parser FunctionTable::TypeMatch() missing compulsory arguments. Dissolve bug (Various).
* Fixed DirectShowSource() Flush task interlock race.
* Fixed DirectShowSource() QueryId() use CoTaskMemAlloc for returned value (Dean Pavlekovic).
* Fixed DirectShowSource() use GraphBuilder object for media control (Avery Lee).
* Fixed DirectShowSource() remove PulseEvent calls (Avery Lee).
* Fixed DirectShowSource() QueryAccept() modifying VideoInfo in running script (Haali).
* Fixed Blankclip clip= argument parsing.
* Fixed trashed GPF report, i.e reading 0x0 at 0x0 exception reporting.
* Fixed and refactored Overlay RGB<->YUV conversion routines.
* Fixed ImageReader incompletely inited videoInfo.
* Fixed Layer RGB32 100% alpha implementation, use level=257 (new default).
* Fixed avisynth_c.h avs_is_parity_known().
* Fixed C++ ConvertAudio::Saturate_int32() rounding.
* Fixed WriteFile(), Now remembers absolute path to file.
* Fixed Info() frame pitch, reports pitch of input frame.
* Fixed Invert() right edge memory overrun/corruption.
* Fixed Histogram() Classic mode pixel values exceeding YUV limits.
* Fixed Histogram() chroma plane initialization to 128.
* Fixed Conditional reader/writer illegally saving pointer to IScriptEnvironment.
* Fixed YV12 Blur()/Sharpen() right edge pixel corruption with non-writable input frames.
* Fixed MMX Blur()/Sharpen() code to full 8 bit precision.
* Fixed IsAudioFloat()/IsAudioInt() script functions.
* Fixed Cache memory oversubscription of SetMemoryMax() limit.

Optimizations:

* DirectShowSource() convertfps=true add 0.5ms rounding to expected sample
- time. Improves performance with millisecond based DS spliters.
* DirectShowSource() FPS detection as last attempt try getting the duration of 1st frame.
* DirectShowSource() convertfps=true rely only on sample start time values.
* Cache: Trap returned NULL PVideoFrames, i.e. Don't crash, Winge about it!.
* Refactor horizontal planar resizer, no width restrictions or 2 byte overwrite.
* Provide a simple and fast text writing primatives, see info.h
* Make audio cache actually functional.
* Tweak speed improvements.
* Subtract speed improvements.
* Tuneup Overlay() ISSE Convert444ChromaToYV12 and also provide MMX version.
* PokeCache interface implemented.
* Cache and Memory management enhancements.

Changes:

* Initial Default Memory Max value clamped to 512MB.
* Initial Default Memory Max value still quarter of Free
- memory. Minimum 16Mb. As per 2.5.7.
* Test VFB data buffer for NULL malloc's, if so then Throw!
* Installer Start menu shortcut names translated.
* Test for UTF-8 and Unicode BOM prefixes and issue a useful warning.
* Removed useless current_sample from runtime script environment.
* Added critical section to CAVIFileSynth class.
* Enable Installer multi language support.
* FunctionTable::Lookup() now considers named arguments in making its selection.
* ImageWriter supports negative values as -count for End argument.
* ChangeFPS() use floor instead of round in source frame number calculation.
* Update usage of correct (updated) Rec.709 coefficients.
* Add TCPDeliver.map and DirectShowSource.map to releases.
* Convert to 2.6 Dynamic Assembled rgb to yuy2 code.
* Avisynth_c.h boolean functions return 1 for true instead of arbitrary non-zero.
* Internal RGB2YUV() now copies Alpha top byte through.
* CoUninitialize() done immediately for S_FALSE CoInitialize() returns.
* Pfc, Softwire and SoundTouch updated and added as dependency projects.
* UPX updated to version 2.03 (2006-11-07).
* AVISource/WavSource map WAVEFORMATEXTENSIBLE back to equivalent WAVEFORMATEX.
* DirectShowSource() now recognises incorrect WAVE_FORMAT_EXTENSIBLE audio and accepts it.
* DirectShowSource() now attempts to use partial graph from failing RenderFile call.
* DirectShowSource() now detects and handles non 32 bit aligned picture lines from dud codecs.
* Crop(align=true) tests actual alignment in each GetFrame call.
* Relax YV12 resizer width restriction, now mod 2 was mod 4.
* .AVSI failures during env->CreateScriptEnvironment() are now available to the GetError() interface.
* SetCacheHints(CACHE_RANGE, n) will now surrender frames to satisfy SetMemoryMax().
* CoInitialize()/CoUninitialize() now done as part of ScriptEnvironment creation/deletion.
* Much code from 2.6 base included. Typically IsYV12() changed to IsPlanar().

A complete list can be found at http://avisynth.org/mediawiki/Changelist

Known problems and issues

* Rightclick on scripts to open them in VDubMod: When the script is messed
- up in the script editor, the correct error message does not appear.
* Possible other bugs which are reported at
- http://sourceforge.net/tracker/?atid=482673&group_id=57023&func=browse


Release Name: AVS 2.5.8 RC5 [081227]

Notes: Includes Czech documentation. Other minor documentation updates. Fix YV12 regression is ShowFiveVersions() Add 0.5millisecond rounding to convertfps logic n DirectShowSource()


2.58 Changes.
Changes from 2.57
Additions

* ConvertAudio(cii) available to plugins via env->Invoke().
* Added font aspect, rotation and alpha to text routines.
* Added /* xxx */ block comments.
* Added [* [* xxx *] *] nestable block comments.
* SetMemoryMax(0) to just return current Memory Max value.
* Added planar YV12 color format to Compare() [Fizick].
* ColorKeyMask: Allow independant tolerance levels for each channel.
* Added Tweak Hue/Saturation range limiting.
* Added AudioLevels and Color2 modes to Histogram.
* Adding global OPT_UseWaveExtensible=True to your script enables WAVE_FORMAT_EXTENSIBLE audio output.
* Added ShowTime() script verb, like ShowSMPTE() but with milliseconds.
* Added BlackmanResize() and Spline64Resize().
* Modified DeleteFrame()/DuplicateFrame() to process multiple arguments.
* Added Min()/Max() script functions.
Bugfixes

* Fixed ImageReader incompletely inited videoInfo.
* Fixed Layer RGB32 100% alpha implementation, use level=257 (new default).
* Fixed avisynth_c.h avs_is_parity_known().
* Fixed C++ ConvertAudio::Saturate_int32() rounding.
* Fixed WriteFile(), Now remebers absolute path to file.
* Fixed Info() frame pitch, reports pitch of input frame.
* Fixed Invert() right edge memory overrun/corruption.
* Fixed Histogram() Classic mode pixel values exceeding YUV limits.
* Fixed Histogram() chroma plane initialization to 128.
* Fixed Conditional reader/writer illegally saving IScriptEnvironment pointer.
* Fixed YV12 Blur()/Sharpen() right edge pixel corruption with non-writable input frames.
* Fixed MMX Blur()/Sharpen() code to full 8 bit precision.
* Fixed IsAudioFloat()/IsAudioInt() script functions.
* Fixed Cache memory oversubscription of SetMemoryMax() limit.
Optimizations

* DirectShowSource() FPS last attempt try for duration of 1st frame.
* DirectShowSource() convertfps rely only on sample start time.
* Refactor horizontal planar resizer, no width restrictions or 2 byte overwrite.
* Provide a simple and fast text writing primatives, see info.h
* Make audio cache actually functional.
* Tweak speed improvements.
* Subtract speed improvements.
* Tuneup Overlay() ISSE Convert444ChromaToYV12 and also provide MMX version.
* PokeCache interface implemented.
* Cache and Memory management enhancements.
Changes

* Convert to Dynamic Assembled rgb to yuy2 code.
* Avisynth_c.h boolean functions return 1 for true instead of arbitrary non-zero.
* Internal RGB2YUV() now copies Alpha top byte through.
* CoUninitialize() done immediately for S_FALSE CoInitialize() returns, i.e we do not hold a COM use count.
* Pfc, Softwire and SoundTouch updated and added as dependency projects.
* UPX updated to version 2.03 (2006-11-07).
* Default Memory Max value increased to half minus 64Mb when over 256MB free.
* AVISource/WavSource map WAVEFORMATEXTENSIBLE back to equivalent WAVEFORMATEX.
* DirectShowSource() now recognises incorrect AM_MEDIA_TYPE subtype for WAVE_FORMAT_EXTENSIBLE audio and corrects the data and accepts it.
* DirectShowSource() now attempts to use partial graph from failing RenderFile call.
* DirectShowSource() now detects and handles non 32 bit aligned picture lines from dud codecs.
* Crop(align=true) tests actual alignment in each GetFrame call.
* Relax YV12 resizer width restriction, now mod 2 was mod 4.
* .AVSI failures during env->CreateScriptEnvironment() are now available to the GetError() interface.
* SetCacheHints(CACHE_RANGE, n) will now surrender frames to satisfy SetMemoryMax().
* CoInitialize()/CoUninitialize() now done as part of ScriptEnvironment creation/deletion.
* Much code from 2.6 base included. Typically IsYV12() changed to IsPlanar().


Summary of changelist (with respect to v2.56)
This Release is the same as 2.5.7-RC3 [311206]
It has just been repackaged for the Russian Documentation.
There are only 4 minor catchups in the Russian Documantation.
* Avisynth COM object now implements IAVIStreaming interface.
* DirectShowSource() enhancements.
* Added KillVideo() verb.
* TimeStretch SoundTouch library update, fixes and access to tuning parameter.
* Explicitly try to request full sample rate, all channels and float, 32 bit then 24 bit samples from the audio codec.
* File input/output support for WAVE_FORMAT_IEEE_FLOAT audio.
* File input more than 2 channels in the audio stream.
* Installer enhancments. Handling of readonly/protected target files.
* Avisynth_c interface enhancments.
* Hack for Fraunhoffer MP3 codec to work when wBitPerSample==16.
* Added Portugese translation by RoLon.
* Partly updated French translation by JasonFly.
* Subtitle multi line text.
* xxxFPS("preset") string preset FPS values.
* ImageSource no longer uses static buffer.
* Fixed Negative int arg handling for ApplyRange() and Animate().
* Fixed SaveString memory block overrun.
* Fixed $Plugin!Functionname!Param$ bug.
* Fixed Various resource leaks.
* Fixed runtime mixed SEH/C++ exception handling for XPsp2.
* Fixed CAVIStreamSynth::Read audio buffer overrun.
* Fixed Assert("...%...") crash.
* Fixed Number parser returning inaccurate float conversions.
* Fixed resizer subpixel shifting functionality and bad edge condition handling.
* YUV ColorBars now match BT.801-1.
* TCPDeliver updates, crash fixes and enhancments, big buffers.
* Fixed Turn*() YUY2 mod 2 height test.
* Fixed AVISource() corrupted error messages.
* Fixed AVISource() direct input drop frame handling.
* Remove 50 plugin auto prescan load limit.
* Bracketless call of functions without arguments now get a cache.
* Over-range numbers now raise a compile time exception.
* xxxFPS(float) now uses continued fraction to generate a minimal rational pair.
* ConvertFPS() blend mode works for all pixel formats.
* SaveString memory blocks are now 32 bit aligned.
* Default planar chroma planes mod 16 aligned.


RC3:
* Fix Cache of a cache of a cache .... problem (regression)
* Have parser check for cache of a cache and skip extra instances.
* Change ImageSource to not use a static buffer.
* The rest as per RC-2 ....


Changelist with respect to RC1:

Additions:
* Blur()/Sharpen() MMX=False option to force use of C++ routines.
* Explicitly try to request input sample rate from the audio codec (Tritical).

Bugfixes:
* Fixed DirectShowSource greyframe regression.
* Fixed DirectShowSource audio format negotiation regression.
* Fixed TCPDeliver YV12 transfer 50% to much data.
* Fixed TCPDeliver do Makewritable before getting params.
* Fixed TCPDeliver audio transfer off by 4 bytes.
* Fixed resizer core boundary condition crashes/errors/glitches.
* Fixed Invert() crash with small widths.
* Fixed small memory leak Amplify().
* Fixed grey frames with internal start, stop, start while DSS is initializing.
* Fixed AudioChannels() returning non-zero when no audio (Tritical).

Optimizations:
* TCPDeliver big buffer enhancement (retro from 2.6 stream).

Changes:
* TCPDeliver add icon, make all resource US English.


AviSynth 2.5.7 Alpha2:

- This installer does not abort on registry error, to aid in debugging the current XPsp2 problem with the installer. i.e. it just stumbles on after the mesagebox, possibly leaving an invalid install. This will be restored after the problem is corrected.
- This version has had the automatic output ConvertAudioTo16Bit disabled to ease the testing of input of WAVE_FORMAT_IEEE_FLOAT type steams. Audio Sample type float will be output as WAVE_FORMAT_IEEE_FLOAT to the host application. None of the popular application can currently handle this stream type. Add a ConvertAudioTo16Bit() to the end of your script. This will be restored for the next release.


AviSynth 2.5.7 Alpha1 (March 26th):

Additions:
* Added portugese translation (by RoLon), and partly french translation (by JasonFly)
* Subtitle multi line text, set LSP arg and use n. (foxyshadis, tateu)
* xxxFPS("preset") string preset FPS values. (Tritical)
* Better avisynth_c cdecl/stdcall mismatch detection and protection (Tritical).

Bugfixes:
* Fixed ConvertAudio SSE2 to Float alignment test.
* Fixed (auto)LoadPlugin altname generation. (Tritical)
* Fixed SaveString memory block overrun.
* Fixed $Plugin!Functionname!Param$ bug. (Fizick)
* Fixed registry handle leak on $PluginDir$ lookup. (Dave Brueck)
* Fixed memory leaks avisynth_c.
* Fixed returning locked/protected VBF's to LRU. (Tritical)
* Fixed runtime mixed SEH/C++ exception handling for XPsp2. (Tritical)
* Fixed CAVIStreamSynth::Read audio buffer overrun. (Avery Lee)
* Fixed DLL handle leak in LoadPlugin. (Tritical)
* Fixed Assert("text") no longer parses % args.
* Fixed number parser returning inaccurate float conversions.
* Fixed ConvertFPS() blend mode not processing of chroma planes.
* Fixed resizer resampling pattern attempted use after deletion.
* Fixed resizer subpixel shifting functionality being a noop.
* Fixed Info() auto font selection metric.
* Fixed Conditional error checking of float RHS.
* Corrected colours in YUV ColorBars, Now match BT.801-1.
* TCPDeliver updates: Client: Fixed crash if client gets disconnected.
* TCPDeliver updates: Server: Remember to disconnect clients when shutdown.
* Fixed Turn*() YUY2 mod 2 height test.
* Fixed AVISource() corrupted error messages.
* Fixed AVISource() direct input drop frame handling.

Optimizations:
* None.

Changes:
* SetMemoryMax() minimum now 4Mb instead of 16. (Tritical)
* Remove 50 plugin auto load limit. (Tritical)
* COM QueryInterface calls now return S_OK instead of NULL.
* Bracketless call of argless function now get a cache. (Tritical)
* Over-range numbers now raise a compile time exception.
* xxxFPS(float) now uses continued fraction to generate a minimal rational pair. (Raymod2)
* ChangeFPS(linear) now raises a compile time exception if the change ratio is > 10.
* ConvertFPS() blend mode works for all pixel formats. (Tritical)
* Info() retrofit of 2.60 updates.
* TCPDeliver.dll upx'ed.
* RGB ColorBars +Q and -I bars, Hue is now correct, Luma is NOT zero to achive this.
* AVISource Audio no longer limited to 2 channels.
* SaveString memory blocks are now 32 bit aligned.
* Default planar chroma planes mod 16 aligned. See SetPlanarLegacyAlignment().


Release 2.5.6a

This is a minor update to the source to correct a problem in avisynth.h The installable file has been rebuilt to make sure it match the accompaning source. There are no substantive changes.


Changes since current release in the latest [2.5.6 Beta Release]
Additions

* SSE3 capable CPU detection in env->GetCPUFlags and Info().
* RGB32 mode in TemporalSoften
* *Resize(), src_height and src_width when negative work as in crop.
* Added options to DirectShowSource (seekzero, timeout and pixel_type).
* Added AudioDubEx(), blindly accepts video and audio streams.
* Added Load_Stdcall_Plugin(), alias for LoadCPlugin() (won't disappear when avisynth_c.dll is loaded).
* Added DevIL support for RGB32 to ImageSource.
* Added Russian language documentation. Thanks to Fizick and his team. Well done.
* Added Merge() filter. Includes very fast iSSE pavgb code for weight=0.5.
* Added MergeARGB(), MergeRGB() filter.
* Added ShowRed(), ShowGreen(), ShowBlue() filters.
* Added Planar version of env->SubFrame() (thanks TSP).
* Added SetPlanarLegacyAlignment() to select Planar alignment algorithm.
* Added Audio padding control to Trim().
* Added operator MulDiv(multiplicand, multiplier, divisor).
* Added AssumeScaledFPS(multiplier, divisor, sync_audio) maps vi.MulDivFPS?.
* Added method VideoInfo.MulDivFPS(unsigned multiplier, unsigned divisor) does rational scaling with normalizing and overflow protection of FPS property.
* Added gamma option (ala ColorYUV) in RGBAdjust.
* Added preliminary 23.976fps film drop frame support to ShowSMPTE(), Anyone know the proposed SMPTE algorithm?
* Added Spline16Resize, Spline36Resize, GaussResize and LanczosResize(tap=xx)
* Added options to ShowFrameNumber: ShowFrameNumber(offset=10, x=360, y=576, font="georgia", size=24, text_color=$ff0000)
* Added integer offset to ShowSMPTE: ShowSMPTE(offset_f=10)
* Added options to ShowSMPTE: ShowSMPTE(offset="00:00:00:30", x=360, y=576, font="georgia", size=24, text_color=$ff0000)
* Added Optional FPS=24 parameter to Dissolve and Fade*() for processing audio only clips.
* Added FadeIn0(), FadeOut0(), FadeIO0() variants that don't add an extra frame.
* Added Fractional resampling support in ResampleAudio().
* Added HasVideo() and HasAudio() script functions.
* Added Level option to Tone().
* Added SFloat support in ResampleAudio().
* Added ColorBars(pixel_type="YUY2, YV12").
* Added env->ManageCache() interface in AviSynth.h.
* Added VideoFrameBuffer 16 byte guardband protection/detection in Debug mode.
* Added EBX compiler bug protection/short circuiting to Cache::GetFrame().
* Added YV12 support for ShowFiveVersions().
* Added "[sse]b" option to Tweak to re-enable the (slow) SSE code (maybe AMD's might run it faster).
* Added Limiter(show=show_luma/show_luma_grey/show_chroma/show_chroma_grey) shows out of bound luma/chroma; *_grey makes the rest of the pixels greyscale.
* Added offsets and analyze option (ala ColorYUV) in RGBAdjust.
* ConvertTo*(Matrix="Rec709, PC.709, PC.601") conversions supported.
* ConvertFPS()/ChangeFPS() copies FPS from a 2nd clip.
* GreyScale() RGB supports Matrix="Rec709, Average".

Bugfixes

* Fixed memory leaks in Overlay and AVSChar/AVSTime.
* Fixed End_of_Stream reset on seek in AudioStreamSource::
* Fixed SegmentedDirectShowSource() argument parsing.
* Fixed *Resize(), src_height and src_width when negative work correctly.
* Fixed minor memory leak in env.VSprintf(), [ul]case() and *str() also remove 4k limits, thanks Tritical.
* Fixed Normalize scribling into memory for float samples.
* Masked "Evaluate: System Exception - Access Violation" in :- FadeIO*(), RGBAdjust(), Tweak(), Lanczos*Resize() and GaussResize().
* Fixed rounding in YUY2 turnleft/right chroma.
* Fixed AVSC_USE_STDCALL declaration in avisynth_c.h (was ACSC_USE_STDCALL).
* Fixed BlankClip(clip) now competely duplicates the donor clip's VI including parity.
* Fixed AssumeTFF/BFF() to correctly update internal parity state.
* Fixed Animate audio switching.
* Fixed aligned UVpitch from width rounding.
* Fixed 2 bit crosstalk in YUV horizontal resizers, thanks Squid.
* Fixed resource leak in DirectShowSource(), thanks Tritical.
* Fixed minor memory leak in Subtitle() and string(), thanks Tritical.
* Fixed global clip close down problem, thanks Tritical.
* Uninstaller now remove Docspictures directory and DirectShowSource and TCPDeliver plugins.
* Fixed ImageReader single file handling.
* Fixed ImageWriter info==false no longer write status text onto frame.
* Trap .WAV clsid handler GPF with filenames gt 47 chars.
* Fixed YUV text access violation, correct bounds alignment tests. (Regression)
* Fixed ExpFunctionCall::Call memory leak, thanks Tritical.
* Fixed PClip leak in MergeChannels(). Destructor chain not called.
* Fixed RGB text alignment inversion. Regression in May 5th ver.
* Fixed vfw resource leaks when opening bad AVI files.
* Fixed rmvb stuck at 100% during encoding (thx stevencover).
* Fixed Loop audio processing.
* Fixed GeneralConvolution crash with cropped input.
* Restored forced (negative) planar luma alignment functionality.
* Fixed a stack of memory leaks, thanks Tritical.
* Fixed Direct AVISource input of raw YV12 and I420 sources.
* Fixed (fingers crossed) "Evaluate: Recognized exception!" Problems with XPsp2 hard terminate.
* Fixed CACHE_RANGE internal scope test, thanks Tritical.
* Fixed Mask() calc of greyscale, red/blue swapped.
* Fixed FPS overflow with Select...(), Interleave() and variants.
* Fixed subtract mode in Overlay (chroma is correctly subtracted).
* Fixed align parameter in Subtitle.
* Revert "Evaluate: Unrecognized exception!" change for hard quit whenever there's an exception instead of showing error message (XPsp2 possible problem due to XPsp2's new msvcrt.dll).
* Windout code is working again (broking in the previous betas).
* Corrected multi-channel audio fading.
* Dissolve and Fade*() process audio only clips, assumes 24fps for position calcs.
* Fixed wrong chroma in DoubleWeave() of FrameBased YV12 material.
* Fixed crash from BlankClip() with an audio only clip template.
* Fixed AudioCache corruption on buffer resize.
* Fixed ResampleAudio() clicks/pops due to creeping error.
* Fixed SSE/SSE2 ConvertAudioTo16/32Bit() positive value saturation.
* Masked EBX compiler bug in audio.cpp, converaudio.cpp, convert_yv12.cpp, memcpy_amd.cpp, focus.cpp, layer.cpp, merge.cpp, resample.cpp, resize.cpp, text_overlay.cpp, conditional_functions.cpp, 444convert.cpp, blend_asm.cpp
* Fixed ConvertToRGB() src->rowsize==8 crash.
* Fixed Memory leak, deleted VideoFrameBuffers.
* Fixed env->NewVideoFrame() returning short frame buffer.
* Fixed vi.FrameFromAudioSamples() truncation.
* Fixed ShowFiveVersions() unused corner rectangles had random contents. Now grey filled
* Fixed YUV plane swapper reports corect name.
* Fixed MergeChroma reporting itself as MergeLuma.
* Fixed MergeChroma doing MakeWriteable() on the wrong clip.
* Fixed Normalize (it was only sampling half of the samples per mouthful; it was ignoring the scaling factor).
* Fixed GreyScale() EBX compiler bug.
* Fixed flipped frame on imagesources.
* PlaneDifference in ConditionalFilter was not reporting exactly 0, if the planes were the same.
* Fixed big bug in compressed YV12 TCPSource / TCPClient in TCPDeliver.
* Increased stringbuffers, 4K to 32K (WarpSharp problem).
* Fixed Overlay(softlight/hardlight) overflow.
* Masked "Unknown exception" in audio.cpp, avs_soundtouch.cpp, color.cpp, field.cpp, focus.cpp, fps.cpp, levels.cpp, resample.cpp, source.cpp
* Fixed WavSource() leaving .WAV files open.
* Fixed glitches in multichannel audio transitions in Dissolve() and Fade*()
* Fixed Green/Blue channel swap in C version of Layer()
* Restored GreyScale() RGB C code.
* Fixed MMX YV12 Blur() double blurring every 8th pixel.
* Blur()/Sharpen() Edges all processed consistantly (edges are reflected).
* Fixed YV12 Blur() width < 16 fatal crash.

Optimizations

* Performance improvents in transfer functions in TCPDeliver.
* Normalize() for 16 bit stop when a max-int value sample is seen.
* Run sort -unique|detab on color_rgb.avsi, got rid of all the duplicates.
* YV12 MergeLuma(), MergeChroma() include very fast iSSE pavgb code for weight=0.5.
* Cleanup VideoFrame garbage collection on script close (Thanks TSP).
* Text overlay antialiaser tweaked, 8% faster Work in progress, more to come.
* RGB32 FlipHorizontal() code tweaked.
* ResampleAudio() MMX for int16 samples, approx 3.25 times faster.
* ResampleAudio() reworked C++ int16 code, approx 35% faster.
* ResampleAudio() reworked buffer management, now linearly accesses child->GetAudio().
* Cache and Memory Managment have been reworked.
* ConvertAudioToFloat() fast SSE and very fast SSE2, opt/skip redundant output copy.
* ConvertAudioTo16,32Bit() very fast SSE2.
* SwapUV() YV12 swaps pointers in PVideoFrame, zero cost!, YUY2 fast iSSE code.
* UtoY(), VtoY(), YtoUV() YUY2 faster C++ code.
* MergeLuma(), MergeChroma() now MMX (not iSSE), has C++ versions, YV12 BlendPlane now does 8 pixels per loop almost 2x faster!.
* ColorBars() generates Tone in constructor buffer, copied out in GetAudio(), avoid 48000 sin(double) per second.
* EnsureVBRMP3Sync() uses 256K transfer buffer when seeking (should be > 5 times faster now).
* Normalize() uses 256K transfer buffer to analyze peaks (should be > 5 times faster now).
* Tweak: added C++ code (lookup table), which is now faster than the old iSSE code.
* Audio.cpp reworked code in audio filters which do 64 bit operations (most routines are between 2 and 5 times faster).
* ConvertToRGB32() MMX RGB24 -> RGB32.
* Blur()/Sharpen() when H or V = 0 skips that pass.
* GreyScale() MMX YUY2.
* Blur()/Sharpen() now MMX (not iSSE), faster, fewer mod(2^n) restrictions.

Changes

* Stop extra search of LIBC, add relsym build - Release with Symbols.
* The avisynth_c plugin entry point is now officially "avisynth_c_plugin_init@4" (don't include @4 anywhere the compiler does it for you), this is not actually a change due to a bug in avisynth_c.h, which incidently caused it to be this already.

* Info() now autoselects a smaller font to fit info in small frames.
* Info() now distinguishes between "assumed" field parity and field parity.
* Animate now selects parity through the filter chain.
* New improved cache!
* Uninstaller now deletes DirectShowSource.dll and TCPDeliver.dll from plugin directory.
* ImageReader doesn't auto fail over to DevIL for DIB/BMP type files. (DevIL crashes on palletted BMPs.)
* ImageWriter now throws an exception for non RGB24 format with DevIL processing.
* ImageReader/Writer info text colour now pale yellow $f0f080.
* Replaced VideoFrame::SubFrame() with env->SubFrame() (Ready for MultiThreading, Thanks TSP).
* Option for planar alignment (default 16 bytes) to be based on chroma planes, luma alignment is (still) 2x chroma. Will become the default in the next version.
* Support for [vfr content in DSS]: DirectShowSource("F:GuidesHybridvfr_startrek.mkv", fps=119.88, convertfps=true) turns vfr into cfr stream by duplicating frames (patch by Nyaochi).
* Histrogram: in color_mode - YUY2: Invalid values (below 16 and above 235) will be colored brown/yellow-ish. Made those values more visible.
* Evaluate: Now breaks outs and reports system exceptions instead of reporting the useless "Evaluate: Unrecognized exception!".
* BlankClip() no longer gobbles any implicit last clip as the template clip. You have to explicitly declare you want a template clip i.e. BlankCLip(Last). "BlankClip()" now always returns the default blank clip.
* Avisynth.h FrameFromAudioSamples/AudioSamplesFromFrames() now test for divide by zero and return zero when encountered instead of crashing.
* SeparateFields() now throws an exception for an IsFieldBased() source.
* Weave() now throws an exception for an IsFrameBased() source.
* Cache policy CACHE_NOTHING currently no long returns all VFB's. Under review.
* Avisynth.h SetFPS() now test for zero numerator or denominator if found it sets num=0, den=1.
* Audio Cache Autodetect lower metric from 25 to 5 on skip forward (step back still 25).
* ConvertAudio() include the prefered type as an acceptable type.
* ConvertAudio() passes SetCacheHints() thru to grandchild.
* Normalize() displays the frame number of the peak.


AviSynth 2.5.6 RC 2 Release (October 7th):

Additions:
* SSE3 capable CPU detection in env->GetCPUFlags and Info().

Bugfixes:
* Fixed memory leaks in Overlay and AVSChar/AVSTime.
* Fixed End_of_Stream reset on seek in AudioStreamSource::
* Fixed SegmentedDirectShowSource() argument parsing.
* Fixed *Resize(), src_height and src_width when negative work correctly.
* Fixed minor memory leak in env.VSprintf(), [ul]case() and *str() also remove 4k limits, thanks Tritical.
* Fixed Normalize scribling into memory for float samples.

Optimizations:
* Performance improvents in transfer functions in TCPDeliver.
* Normalize() for 16 bit stop when a max-int value sample is seen.

Changes:
* Stop extra search of LIBC, add relsym build - Release with Symbols.


Changes from 2.55
Additions

* RGB32 mode in TemporalSoften
* *Resize(), src_height and src_width when negative work as in crop.
* Added options to DirectShowSource (seekzero, timeout and pixel_type).
* Added AudioDubEx(), blindly accepts video and audio streams.
* Added Load_Stdcall_Plugin(), alias for LoadCPlugin() (won't disappear when avisynth_c.dll is loaded)
* Added DevIL support for RGB32 to ImageSource.
* Added Russian language documentation. Thanks to Fizick and his team. Well done.
* Added Merge() filter. Includes very fast iSSE pavgb code for weight=0.5.
* Added MergeARGB(), MergeRGB() filter.
* Added ShowRed(), ShowGreen(), ShowBlue() filters.
* Added Planar version of env->SubFrame() (thanks TSP).
* Added SetPlanarLegacyAlignment() to select Planar alignment algorithm.
* Added Audio padding control to Trim().
* Added operator muldiv(multiplicand, multiplier, divisor).
* Added AssumeScaledFPS(multiplier, divisor, sync_audio) maps vi.MulDivFPS.
* Added method VideoInfo.MulDivFPS(unsigned multiplier, unsigned divisor) does rational scaling with normalizing and overflow protection of FPS property.
* Added offsets, gamma and analyze option (ala ColorYUV) in RGBAdjust.
* Added preliminary 23.976fps film drop frame support to ShowSMPTE(), Anyone know the proposed SMPTE algorithm?
* Added Spline16Resize, Spline36Resize, GaussResize and LanczosResize(tap=xx)
* Added options to ShowFrameNumber: ShowFrameNumber(offset=10, x=360, y=576, font="georgia", size=24, text_color=$ff0000)
* Added integer offset to ShowSMPTE: ShowSMPTE(offset_f=10)
* Added options to ShowSMPTE: ShowSMPTE(offset="00:00:00:30", x=360, y=576, font="georgia", size=24, text_color=$ff0000)
* Added Optional FPS=24 parameter to Dissolve and Fade*() for processing audio only clips.
* Added FadeIn0(), FadeOut0(), FadeIO0() variants that don't add an extra frame.
* Added Fractional resampling support in ResampleAudio().
* Added HasVideo() and HasAudio() script functions.
* Added Level option to Tone().
* Added SFloat support in ResampleAudio().
* Added ColorBars(pixel_type="YUY2, YV12").
* Added env->ManageCache() interface in AviSynth.h.
* Added VideoFrameBuffer 16 byte guardband protection/detection in Debug mode.
* Added EBX compiler bug protection/short circuiting to Cache::GetFrame().
* Added YV12 support for ShowFiveVersions().
* Added "[sse]b" option to Tweak to re-enable the (slow) SSE code (maybe AMD's might run it faster).
* Added Limiter(show=show_luma/show_luma_grey/show_chroma/show_chroma_grey) shows out of bound luma/chroma; *_grey makes the rest of the pixels greyscale.
* ConvertTo*(Matrix="Rec709, PC.709, PC.601") conversions supported.
* ConvertFPS()/ChangeFPS() copies FPS from a 2nd clip.
* GreyScale() RGB supports Matrix="Rec709, Average".
Bugfixes

* Masked "Evaluate: System Exception - Access Violation" in :- FadeIO*(), RGBAdjust(), Tweak(), Lanczos*Resize() and GaussResize().
* Fixed rounding in YUY2 turnleft/right chroma.
* Fixed AVSC_USE_STDCALL declaration in avisynth_c.h (was ACSC_USE_STDCALL).
* Fixed BlankClip(clip) now competely duplicates the donor clip's VI including parity.
* Fixed AssumeTFF/BFF() to correctly update internal parity state.
* Fixed Animate audio switching.
* Fixed aligned UVpitch from width rounding.
* Fixed 2 bit crosstalk in YUV horizontal resizers, thanks Squid.
* Fixed resource leak in DirectShowSource(), thanks Tritical.
* Fixed minor memory leak in Subtitle() and string(), thanks Tritical.
* Fixed global clip close down problem, thanks Tritical.
* Uninstaller now remove Docspictures directory and DirectShowSource and TCPDeliver plugins.
* Fixed ImageReader single file handling.
* Fixed ImageWriter info==false no longer write status text onto frame.
* Trap .WAV clsid handler GPF with filenames gt 47 chars.
* Fixed YUV text access violation, correct bounds alignment tests. (Regression)
* Fixed ExpFunctionCall::Call memory leak, thanks Tritical.
* Fixed PClip leak in MergeChannels(). Destructor chain not called.
* Fixed RGB text alignment inversion. Regression in May 5th ver.
* Fixed vfw resource leaks when opening bad AVI files.
* Fixed rmvb stuck at 100% during encoding (thx stevencover).
* Fixed Loop audio processing.
* Fixed GeneralConvolution crash with cropped input.
* Restored forced (negative) planar luma alignment functionality.
* Fixed a stack of memory leaks, thanks Tritical.
* Fixed Direct AVISource input of raw YV12 and I420 sources.
* Fixed (fingers crossed) "Evaluate: Recognized exception!" Problems with XPsp2 hard terminate.
* Fixed CACHE_RANGE internal scope test, thanks Tritical.
* Fixed Mask() calc of greyscale, red/blue swapped.
* Fixed FPS overflow with Select...(), Interleave() and variants.
* Fixed subtract mode in Overlay (chroma is correctly subtracted).
* Fixed align parameter in Subtitle.
* Windout code is working again (broking in the previous betas).
* Corrected multi-channel audio fading.
* Dissolve and Fade*() process audio only clips, assumes 24fps for position calcs.
* Fixed wrong chroma in DoubleWeave() of FrameBased YV12 material.
* Fixed crash from BlankClip() with an audio only clip template.
* Fixed AudioCache corruption on buffer resize.
* Fixed ResampleAudio() clicks/pops due to creeping error.
* Fixed SSE/SSE2 ConvertAudioTo16/32Bit() positive value saturation.
* Masked EBX compiler bug in :- audio.cpp converaudio.cpp convert_yv12.cpp memcpy_amd.cpp focus.cpp layer.cpp merge.cpp resample.cpp resize.cpp text_overlay.cpp conditional_functions.cpp 444convert.cpp blend_asm.cpp
* Fixed ConvertToRGB() src->rowsize==8 crash.
* Fixed Memory leak, deleted VideoFrameBuffers.
* Fixed env->NewVideoFrame() returning short frame buffer.
* Fixed vi.FrameFromAudioSamples() truncation.
* Fixed ShowFiveVersions() unused corner rectangles had random contents. Now grey filled
* Fixed YUV plane swapper reports corect name.
* Fixed MergeChroma reporting itself as MergeLuma.
* Fixed MergeChroma doing MakeWriteable() on the wrong clip.
* Fixed Normalize (it was only sampling half of the samples per mouthful; it was ignoring the scaling factor).
* Fixed GreyScale() EBX compiler bug.
* Fixed flipped frame on imagesources.
* PlaneDifference in ConditionalFilter was not reporting exactly 0, if the planes were the same.
* Fixed big bug in compressed YV12 TCPSource / TCPClient in TCPDeliver.
* Increased stringbuffers, 4K to 32K (WarpSharp problem).
* Fixed Overlay(softlight/hardlight) overflow.
* Masked "Unknown exception" in :- audio.cpp avs_soundtouch.cpp color.cpp field.cpp focus.cpp fps.cpp levels.cpp resample.cpp source.cpp
* Fixed WavSource() leaving .WAV files open.
* Fixed glitches in multichannel audio transitions in Dissolve() and Fade*()
* Fixed Green/Blue channel swap in C version of Layer()
* Restored GreyScale() RGB C code.
* Fixed MMX YV12 Blur() double blurring every 8th pixel.
* Blur()/Sharpen() Edges all processed consistantly (edges are reflected).
* Fixed YV12 Blur() width < 16 fatal crash.
Optimizations

* Run sort -unique|detab on color_rgb.avsi, got rid of all the duplicates.
* YV12 MergeLuma(), MergeChroma() include very fast iSSE pavgb code for weight=0.5.
* Cleanup VideoFrame garbage collection on script close (Thanks TSP).
* Text overlay antialiaser tweaked, 8% faster Work in progress, more to come.
* RGB32 FlipHorizontal() code tweaked.
* ResampleAudio() MMX for int16 samples, approx 3.25 times faster.
* ResampleAudio() reworked C++ int16 code, approx 35% faster.
* ResampleAudio() reworked buffer management, now linearly accesses child->GetAudio().
* Cache and Memory Managment have been reworked.
* ConvertAudioToFloat() fast SSE and very fast SSE2, opt/skip redundant output copy.
* ConvertAudioTo16,32Bit() very fast SSE2.
* SwapUV() YV12 swaps pointers in PVideoFrame, zero cost!, YUY2 fast iSSE code.
* UtoY(), VtoY(), YtoUV() YUY2 faster C++ code.
* MergeLuma(), MergeChroma() now MMX (not iSSE), has C++ versions, YV12 BlendPlane now does 8 pixels per loop almost 2x faster!.
* ColorBars() generates Tone in constructor buffer, copied out in GetAudio(), avoid 48000 sin(double) per second.
* EnsureVBRMP3Sync() uses 256K transfer buffer when seeking (should be > 5 times faster now.)
* Normalize() uses 256K transfer buffer to analyze peaks (should be > 5 times faster now).
* Tweak: added C++ code (lookup table), which is now faster than the old iSSE code.
* Audio.cpp reworked code in audio filters which do 64 bit operations (most routines are between 2 and 5 times faster).
* ConvertToRGB32() MMX RGB24 -> RGB32.
* Blur()/Sharpen() when H or V = 0 skips that pass.
* GreyScale() MMX YUY2.
* Blur()/Sharpen() now MMX (not iSSE), faster, fewer mod(2^n) restrictions.
Changes

* The avisynth_c plugin entry point is now officially "avisynth_c_plugin_init@4" (don't include @4 anywhere the compiler does it for you), this is not actually a change due to a bug in avisynth_c.h, which incidently caused it to be this already.
* Info() now autoselects a smaller font to fit info in small frames.
* Info() now distinguishes between "assumed" field parity and field parity.
* Animate now selects parity through the filter chain.
* New improved cache!
* Installer now populates "All Users" shell tree on NT variants. Admin/Uninstaller stuff is only added to current user.
* Uninstaller now deletes DirectShowSource.dll and TCPDeliver.dll from plugin directory.
* ImageReader doesn't auto fail over to DevIL for DIB/BMP type files. (DevIL crashs on palletted BMP's)
* ImageWriter now throws an exception for non RGB24 format with DevIL processing.
* ImageReader/Writer info text colour now pale yellow $f0f080.
* Replaced VideoFrame::SubFrame() with env->SubFrame() (Ready for MultiThreading, Thanks TSP).
* Option for planar alignment (default 16 bytes) to be based on chroma planes, luma alignment is (still) 2x chroma. Will become the default in the next version.
* Support for vfr content in DSS: DirectShowSource("F:GuidesHybridvfr_startrek.mkv", fps=119.88, convertfps=true) turns vfr into cfr stream by duplicating frames.
* Histrogram: in color_mode - YUY2: Invalid values (below 16 and above 235) will be colored brown/yellow-ish. Made those values more visible.
* Evaluate: Now breaks outs and reports system exceptions instead of reporting the useless "Evaluate: Unrecognized exception!".
* BlankClip() no longer gobbles any implicit last clip as the template clip. You have to explicitly declare you want a template clip i.e. BlankCLip(Last). "BlankClip()" now always returns the default blank clip.
* Avisynth.h FrameFromAudioSamples/AudioSamplesFromFrames() now test for divide by zero and return zero when encountered instead of crashing.
* SeparateFields() now throws an exception for an IsFieldBased() source.
* Weave() now throws an exception for an IsFrameBased() source.
* Cache policy CACHE_NOTHING currently no long returns all VFB's. Under review.
* Avisynth.h SetFPS() now test for zero numerator or denominator if found it sets num=0, den=1.
* Audio Cache Autodetect lower metric from 25 to 5 on skip forward (step back still 25).
* ConvertAudio() include the prefered type as an acceptable type.
* ConvertAudio() passes SetCacheHints() thru to grandchild.
* Normalize() displays the frame number of the peak.

Hide changelog



Alternative to Avisynth:
VapourSynth



Guides and How to's:
AVI to DVD MPEG (using CCE or TMPGenc encoders) - Read
AVSEdit - AviSynth for the scripting impaired - Read
Convert RealMedia to AVI / MKV - Read
Converting AVI to MPEG-2 with AviSynth and TMPGEnc Xpress - Read
DJRumpy's SVCD to DVD MPEG Guide - Read
doom9 DV to DVD guide - Read
DVD to XviD Conversion using DVD2AVI,AviSynth,Virtualdub - Read
How to convert RM/RMVB to AVI or MPEG1/2 - Read
How to Encode Womble Mpeg Video Wizard projects with HCenc - Read
How to frameserve (dvd2avi / VirtualDub / Avisynth / VFAPI) - Read
How to make DVD motion menus - Read
How to open MP4,MKV,WMV,RM,MOV with any editor,encoder - Read
How to use AviSynth with the Convolution3D "video noise" filter including editing with VirtualDubMod - Read
Newbie Guide for Converting AVI2MPEG2 Compliant DVD Using CCE - Read
Remove an opaque logo using Xlogo in Avisynth - Read
Using a frameserver between Premiere and TMPGEnc - Read
Using avsFilmCutter's Script Editor - Read
Using avsFilmCutter's Video Editor - Read
View all guides with guide description here


Comments Post comment
20 comments, Showing 1 to 20 comments
 - 

Tiny < 5MB and the most powerful on the planet.
It offers much more features than any professional software of 3+ GB can offer.

Ease of Use scored to 3 coz not newbie friendly, Newbie need a nice learning-ride to AVISynth Scripting Language. Best combo for Newbies might be VD or VDMod (sadly frozen project) plus MPC.
Overall scored to 10 because of unique features for absolutely FREE.

Sincere Bunch of THANKS to those who are devoted in the Developments.
Keep The GooD show RuNNinG.
:)



Posted May 26, 2011 by . Tool version 2.6.0 Alpha 3 using OS Other
Ease of use 3 of 10 Functionality 10 of 10 Value for money 10 of 10 Overall score 10 of 10


This is the ONLY free non linear video editor that you'll EVER need. Nothing else compares to Avisynth simply for the fact that there are hundreds of third party filters that will suit your need. It can do anything you want, provided that you have the approriate plugins annd filters, from denoising to deinterlacing and etc. What sets Avisynth apart from other softwares is that it is completely script base; this makes the learning curve much more difficult compared to other video editors. If you are not satisfied with the repertoir of filters available to you, you can even create your own via the scripting language or by plugins. I gave the ease of use a 5 because of the learning curve and the fact that you have to spend extensive amount of time searching and testing external filters that you'll like.


Posted June 01, 2010 by . Tool version 2.58 using OS Windows 7
Ease of use 5 of 10 Functionality 10 of 10 Value for money 10 of 10 Overall score 10 of 10


Does almost anything but the documentation is hard to understand quickly even if you have programing experience. The documentation of variable usage was a short summary for example. Also the external plugins are somewhat hard to used with some of the commands requiring you to load a plugin that throws errors that avisynth can't give useful error or dug information for. With the addition of one of the text editors designed for avs scripts its quite easy to use.


Posted February 06, 2010 by . Tool version 2.58 using OS WinXP
Ease of use 8 of 10 Functionality 10 of 10 Value for money 10 of 10 Overall score 10 of 10


Wow Hydra, that video link shows, in ways that words can't describe, how effective Avisynth is. It's a required plugin to many video processors/encoders like DVDRebuilder etc. Often you don't have to do anything, it works more or less in the background. Great stuff.


Posted January 10, 2010 by . Tool version 2.6.0 using OS Windows 7
Ease of use 7 of 10 Functionality 10 of 10 Value for money 10 of 10 Overall score 9 of 10


Avisynth is one of the most powerful and useful tools out there. This is best for all folks who prefer total control over their editing using scripting. There are so many filters that are available and can be used. There are still areas where this can be improved more. There are GUIs like AVSP and AVSEdit, but a GUI which helps editing and scripting would be the ultimate.


Posted January 10, 2010 by . Tool version 2.5 using OS Vista
Ease of use 8 of 10 Functionality 9 of 10 Value for money 10 of 10 Overall score 10 of 10


It looks like a very powerful tool an I believe all the experts here can't be wrong when they say so. But for a simpleton like me, it is a time consuming and frustrating experience trying to use its functionality. I wish it was as simple as virtualdub to use. But then this is not a pwrfect world.


Posted January 09, 2010 by . Tool version 2.5 using OS WinXP
Ease of use 2 of 10 Functionality 5 of 10 Value for money 5 of 10 Overall score 4 of 10


Agreed, it's way over his/her head - a lazy person who didn't value powerful tools or the end results. I have been using Avisynth successfully for YEARS to do really nice/hard jobs by applying filters to video in various ways - eg to SUBSTANTIALLY cleanup home video, or VHS captures, or 8mm captures. This is truly a GIANT amongst tools (albeit it works with the help of lots of free 3rd party filters... head on over to doom9 to see it discussed in alive forums). No other free tool comes even close to its versatility and sheer power to adjust video content. So many free actively-developed filters to choose from ! Use a stable released version, though, eg 2.5.7(MT).

Avisynth enables you to do things with video which you wouldn't believe. This example gives you some idea of what type of video cleanup is possible http://www.vimeo.com/2823934

Although, it is not a tool to go into without a willingness to learn and "have a go". Even I could pick up the scipting with the plentiful examples available and the fantastic help available via "pros" always willing to lend advice and assistance on the forums. I would be totally lost without this truly magnificent free tool. Crikey, it's a keeper.



Posted January 09, 2010 by . Tool version 2.5.7 using OS WinXP
Ease of use 5 of 10 Functionality 10 of 10 Value for money 10 of 10 Overall score 10 of 10


Yeah, you're right Peterbuilt, 'nuff said. It's way over your head anyway. After all, you spend most of your time cruising the forums thread crapping and saying stupid shit. Very productive.

Avisynth is a staple in many video editing softwares. Many couldn't function without it.



Posted January 09, 2010 by . Tool version 2.6.0 using OS Windows 7
Ease of use 7 of 10 Functionality 10 of 10 Value for money 10 of 10 Overall score 9 of 10


A tool for video dorks and geeks!
why bother.
nuff said.




Posted January 09, 2010 by . Tool version shitt using OS WinXP
Ease of use 1 of 10 Functionality 1 of 10 Value for money 1 of 10 Overall score 1 of 10


do not use latest version. it crashes every time using ripbot264. i had to revert to older version . graph crashes .


Posted January 09, 2010 by . Tool version 2.58 using OS Windows 7
Ease of use 2 of 10 Functionality 5 of 10 Value for money 10 of 10 Overall score 6 of 10


Scripting is simple even if your programming experience is limited to BASIC.
Always available from sourceforge.net(search)
current download page
http://sourceforge.net/project/showfiles.php?group_id=57023



Posted December 26, 2006 by . Tool version 2.5.7 RC2 using OS WinXP
Ease of use 5 of 10 Functionality 10 of 10 Value for money 10 of 10 Overall score 10 of 10


Love AVISynth. Can't stand it's website, or lack thereof. I see that 2.5.7 RC2 has been released, but where?!?!


Posted December 25, 2006 by . Tool version 2.5.7 RC2 using OS WinXP
Ease of use 10 of 10 Functionality 10 of 10 Value for money 10 of 10 Overall score 10 of 10


It is like programming environment for videos :)


Posted June 13, 2006 by . Tool version 2.57 using OS WinXP
Ease of use 5 of 10 Functionality 10 of 10 Value for money 10 of 10 Overall score 10 of 10


Incredible results. The Denoisers, Sharpeners, Macro Block Deblockers are the best. If you want truly superior looking final material, this is the app.

Don't be daunted by the scripting. You can start by copying other scripts and slowly making modifications to suit your needs.



Posted June 18, 2005 by . Tool version 2.5 using OS WinXP
Ease of use 6 of 10 Functionality 10 of 10 Value for money 10 of 10 Overall score 10 of 10


This is the ultimate solution for video processing - nothing , no matter how much it costs, will beat AviSynth!

There is kind of a steep learning curve is it's all script-based, but you'll get the hang of it eventually, and if you've done any programming (especially C) it won't be as bad.

There's an astronomical amount of filters made for it, and the best part is everything's free!

I use it with VirtualDub/VirtualDubMod for testing, previewing and Huffyuv/MJPEG encoding, and XviD and QuEnc (a great free MPEG encoder) for encoding.



Posted June 15, 2005 by . Tool version 2.5.6 using OS Win2K
Ease of use 5 of 10 Functionality 10 of 10 Value for money 10 of 10 Overall score 10 of 10


Very powerful tool, with good built in filters and some great 3rd party plugins available. Serving to CCE is working without any problem. Certainly not for beginners, since you have to do some scripting, but it's functionality is almost infinite. It's also pretty fast, faster than serving from VirtualDub.

I use it to filter multiple captured avis from analogue sources, and encoding them over night via CCE without those huge temp files, and it has always produced superb results. And: it's free!



Posted April 20, 2005 by . Tool version 2.5.1 using OS WinXP
Ease of use 7 of 10 Functionality 10 of 10 Value for money 10 of 10 Overall score 10 of 10


Amazingly powerful tool... I haven't touch on even 1% of its functionality yet. Even if you don't know much, you can do a whole lot with quite a small amount of knowledge.

The learning curve is not trivial though, so you'll have to start working with it regularly to really delve into its power.



Posted February 26, 2005 by . Tool version 2.5 using OS Win2K
Ease of use 3 of 10 Functionality 10 of 10 Value for money 10 of 10 Overall score 9 of 10


I give this a 9 for Ease of Use because it is challenging, but once you get the hang of it, you're all set! The functionality is superb, 1 for Money Value since it is free and should always be kept that way. I absolutely love the possibilities and nearly unlimited and varying functions this application's post-processing can provide for any video. The forums of this program are visited daily by very helpful and informative users who know what they are talking about because it takes a lot more than a few clicks of the mouse to actually use AviSynth, and keystrokes at that, not so many mouse clicks. Anyway, I have been reading the forums, experimenting with various filters to enhance my DV sources and am astounded that I can open a home video in Media Player Classic and have it look much better than source video by simply typing up a text file! I was a newbie at this two weeks ago and thought it was more than I could ever handle, but surprisingly, it really isn't that hard. If I can do this, ANYONE can. For quality freaks like myself, if you want just the right pitch to the appearance of your video and efficient encoding resulting in well calculated filesizes, use AviSynth and its associated applications via DebugMode's FrameServing. Works in conjunction with VirtualDub also. One of the most unique things about AviSynth is its respect towards minimizing colorspace conversions, which preserves much detail! QuEnc encodes your AviSynth scripts as MPEG-1 or MPEG-2. Frameserve into Adobe products and frameserve out of them into the most efficient encoders like TMPGEnc and others! You will never regret learning the ways of advanced video production.


Posted January 03, 2005 by . Tool version 2.5.5 using OS WinXP
Ease of use 9 of 10 Functionality 10 of 10 Value for money 1 of 10 Overall score 10 of 10


Cant believe this util has only 1 comment!!! If you are using virtualdub and have hit the ceiling on what it can do, then it is time to step up to avisynth. This is a rather recent discovery for me, as I refused to use it because it dies not have a GUI like virtualdub. Using the forums at doom9.org, asking numerous questions and doing small test with the scripts and using virtualdub/virtualdubMod as my psuedo-GUI, I have not looked back, since. Filters are much better than virtualdub and the community of filter development and research is vibrant and dynamic. Use it now for bad VHS, TV caps, DVD rips to DVD/DivX/XviD/WMV. No comparison. There is a learning curve, but once you get past the early frustrations of writing your scripts, you are home free.

Version 2.5.5 works for me using Winn98SE, Win2K, WinXP.



Posted December 15, 2004 by . Tool version 2.5.4 using OS WinXP
Ease of use 8 of 10 Functionality 10 of 10 Value for money 10 of 10 Overall score 9 of 10


The ultimate video processing tool. Powerful is an understatement; it is only limited by your imagination and programming ability. Can do virtually anything to virtually any video source with the right code & plugins. Great for rescaling, deinterlacing, denoising, enhancing, frame rate conversions, and the list goes on forever. Not for the technically challenged but with a little learning curve (or astute script searching) you are off & running.


Posted December 13, 2004 by . Tool version 2.55 using OS WinXP
Ease of use 6 of 10 Functionality 10 of 10 Value for money 10 of 10 Overall score 10 of 10

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