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VapourSynth is an application for video manipulation. Or a plugin. Or a library. Itís hard to tell because it has a core library written in C++ and a Python module to allow video scripts to be created. It came to be when I started thinking about alternative designs for Avisynth and most of it was written over a 3 month period. The software has been heavily inspired by Avisynth and aims to be a 21st century rewrite, taking advantage of the advancements computers have made since the late 90s. Requires Python! Full description.

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Version:r25 History
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Size:7.2MB



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  Latest version:
r25 (November 24, 2014)


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Version history / Release notes / Changelog:
R25 Ė Death to Windows XP!
Posted on November 24, 2014

The main new features this time are:

Added more missing modes to RGVS and VerticalCleaner
Saner loading of plugins with multiple dlls on windows, the directory containing the loaded plugin will now be searched as well
Includes pdb files for vapoursynth.dll to help debugging and plugin development
The possibility to chain commands together
Wonít work on XP anymore

Hereís how you can now combine commands. The clip gets passed as the first unnamed argument to the next command.

core.ffms2.Source('rule6.mkv').std.FlipVertical()[:100].set_output()


R24 Ė Making VSScript Sane
Posted on August 14, 2014

Itís finally time for another release with big improvements. Mostly because people tried to use VapourSynth and had opinions about it, and as a result the VSScript API has been improved to make more sense and plenty of minor odd things in the Python module have been fixed.

Release highlights:

FreezeFrames, DuplicateFrames and DeleteFrames filters added
An experimental ImageMagick reader/writer added
VSPipe can pass arguments into scripts being evaluated
The number of threads to use can be set at any time both from the API and Python
The VSScript API has been improved and now behaves more sanely in addition to reporting failure/success for more operations
An exceptional number of serious bugs fixed, most of them fortunately rare
Main compatibility issues with previous versions:

The Python module no longer adjusts arguments for filters that had them changed in R22. See the R22 release post for more details.
VSPipe has a new argument parser and slightly changed argument handling better match command line utilities in general. Short versions of arguments have also been added.


R23 Ė A Typical Maintenance Release
Posted on March 11, 2014

R23 is done. As usual it took a bit longer than expected since people kept finding bugs in the RC builds. Thereís really nothing exciting here at all. Only a fix for a pile of crash bugs in filters and documentation errors. Non-windows users may also enjoy some of the improvements to the build system that makes it a bit less finicky.

Summary: everyone should upgrade but must look bored while doing so.


R22 Ė The number of bits shall be 64
Posted on December 10, 2013
Have you ever wanted to encode things in 64 bits? Now you can!

The latest release adds support for x64 windows and all native filters have x64 compiles ready as well, however Avisynth x64 plugins canít be loaded because the moron who originally converted the Avisynth header did it in a sloppy way and forgot to make the memory offsets stored as a ptrdiff_t.

There have also been substantial changes to the core code as all use of the Qt libraries have been removed and replaced with C++11 instead. This reduces the number of dependencies and makes VapourSynth easier to compile. During this process all the locking was reviewed and every relevant function should now be thread-safe. For those of you who want to contribute to the core project there are Visual Studio 2013 projects available in the repository which makes compiling a lot easier.

Those were the major changes, hereís a list of some of the smaller improvements made:

Added the MakeDiff and MergeDiff filters (equivalent to masktoolís mt_makediff and mt_adddiff)
Arguments passed to functions with the value None are now ignored in Python ó this makes it much easier to pass on filter arguments
Filter arguments in Python now accept any iterable type and not just lists ó go crazy and use expressions such range(3) or (clipa, clipb) as function arguments
The usual small tweaks such as improved code examples, fps display in vspipe and rare memory leak fixes
Important Compatibility Information

Lut2, Merge and MaskedMerge now take two clip arguments instead of the original two clip array. For example:

core.std.Merge(clips=[clip1, clip2], 0.5)
Should be changed to:

core.std.Merge(clipa=clip1, clipb=clip2, 0.5)
The python module will automatically rewrite it to the new version for now to keep script compatibility. Script writers who want to test that their script works with only the new behavior can create a new core this way:

vs.get_core(r21_arg_compat=False)


R21 Ė Big Improvements Again!
Posted on October 29, 2013
Itís once again time for a release. This release can mostly be described as a big bugfix one. Mostly taking care of some bugs introduced in R20 (which is no longer linked since R19 is better to use when testing if things work in a previous version). Anyway, the main new features are:

FrameEval Ė A nice and convenient way to do almost any per frame operation conceivable
RemoveGrain/Repair ó Now ported to be native plugins
Text Ė A very handy function to print text for debug purposes
There are also plenty of small improvements such as error messages being printed on VFW error clips, optimizations of common functions and fixes here and there.

For R22 the long C++11 migration will start. The ultimate goal is to remove the dependency on Qt completely but that will most likely take over a year to accomplish. As a short term goal writing more filters is my priority.


R19:
lut/lut2 now processes all planes by default
ported to work on arm and powerpc (Zor)
fixed 9-16 bit format support in Expr
properly initialize color in addborders to 0
calls to the getFrame() function inside vapoursynth can never deadlock now, the thread handling is also slightly improved
fixed a bug in the cache that would stop it from freeing all its frames when memory is needed, fixes an out of memory error reported by Chikuzen
output is no longer determined by setting the last variable in __main__, instead clip.set_output(int index = 0) is used to set which clip(s) are exported
fixed some memory leaks in the internal filters when they're freed (jackoneill)
now properly initializes blankclips to all 0 when no values are given
added proper const declarations now that cython supports it, cython 0.18 or later required to build the extension now
fixed get_write_ptr() in python to actually return a write pointer
fixed the lut and lut2 filters for > 8 bit formats (ADub)
various minor fixes to vivtc
removed clip.output() since it's a bad design decision, now a command-line program called vspipe can be used to pipe or write raw video output
renamed newMap() to createMap() to match the naming of all other functions
added core.get_plugins() for the core and core.namepace.get_functions() for namespaces, it works similarly to list_functions() but instead returns the information in a dict
removed the unmentioned and unused link option for filter arguments as it is completely pointless and similar functionality may be implemented anyway
there's now a sane external api available for embedding in other applications, see vsscript.h and vsvfw for an example
now a singleton pattern is used for the core in python scripts, use vs.get_core() to get a reference to it
clip.get_frame() now throws an exception when out of bounds frames are requested
fixes a reference leak in the VideoProps python class
now ignores functions with . in their argument string for avisynth compatibility, this makes warpsharp mostly compatible


R18 Ė Beta Quality
Posted on January 14, 2013
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Iím back on my release early and often scheduleÖ or at least something resembling it. This is a big bug fix release and officially brings the core of VapourSynth to beta quality. Less memory will be leaked and pressing F2 in VirtualDub is no longer the fastest way to run out of address space and crash.

There are only a few more things to add and change but the goal is getting closer. Report any bug you find no matter how small it is. The focus of the next release will be on performance and Iím interested in all speed comparisons between VapourSynth and Avisynth, especially the single threaded versions.

You should also check out Chikuzenís GenericFilters which implement almost all missing features from masktools that arenít already present in the core. This has made it possible to port a few more scripts to be fully native.

If youíre curious about the future direction and changes go check out the bug tracker. I use it as a place to write down most planned enhancements as well and scribble a row or two about it. I have also been commissioned to make an image writer plugin based on ImageMagick so that will most likely show up before R19.


R17 Ė A Soft Package
Posted on December 27, 2012
It took a bit longer than I anticipated to get R17 done but itís finally done enough. The highlights are:

User contributions! Ė this is the first release where several fixes and parts were contributed by other people
The new Expr filter (similar to mt_lutxyz) which can evaluate expressions per pixels during run-time
A subtitle filter based on libass (inappropriately named assvapour)
Lots of bugfixes, for example AVISource should now be usable with all formats and alpha output
Even stricter checks for filters Ė the ongoing work to detect common coding and API usage errors continues
With this release a few more popular scripts can be implemented using only VapourSynth filters, however the work will continue to recreate the missing common filters from masktools. I would appreciate some help in implementing equivalents to mt_edge, mt_inpand, mt_expand, mt_inflate and mt_deflate. Itís a simple project and good for someone who wants to get started writing filters and help out, I just happen to want to start with the challenging stuff. MVTools. The core part of several of the most powerful Avisynth scripts and a something that could certainly use a rewrite.

Posted in VapourSynth | Leave a reply


R16 Ė The Slightly Less Broken Release
Posted on November 18, 2012
R15 had a serious issue that prevented the Avisynth compatibility stuff from working with anything except YV12, this release mainly fixes it. There isnít much else new of interest in this release.

If you need more stuff to fidget with then go try the new resizers for VapourSynth too. They will most likely replace swscale once they become stable so testing is appreciated. Theyíre based on the dither tools code.

Next on my own todo list is a plugin to evaluate expressions at run-time, think mt_lutxy(z) but without insane memory requirements for 16bit formats. The other thing on the list mostly is about VSFS and that is to improve error handling and adapt the code to the latest Pismo File Mount API.

Posted in VapourSynth


R15 Ė API Improvements
Posted on November 15, 2012
The time has come to break the API slightly to add some missing features. It also ends the alpha support discussion. The proper (and only) way to handle alpha is to return it as a separate mask clip. To make this easier filters now have a reasonably simple API to return more than one clip.

The new filters this time try to fill in some of the biggest feature holes, they are Merge, MaskedMerge and AVISource. MaskedMerge is very similar to masktoolís mt_merge in terms of functionality and the other two are very similar to the internal Avisynth filters with the same name. AVISource can of course open both VapourSynth and Avisynth scripts for import too.

There are also minor changes that need to be done to make plugins compile (binary compatibility with old plugins is however preserved). Previously the VSNodeRef type was always declared as const, this superfluous const declaration has now been removed everywhere in the API. Below are examples of the other two changes needed.

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vsapi->setVideoInfo(a, b);
Change it to:
vsapi->setVideoInfo(a, 1, b);
The other construct that needs changing is filter creation which now automatically assigns itself to the out map:

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cref = vsapi->createFilter(in, out, "Invert", invertInit, invertGetFrame, invertFree, fmParallel, 0, data, core);
vsapi->propSetNode(out, "clip", cref, 0);
vsapi->freeNode(cref);
Change it to:
vsapi->createFilter(in, out, "Invert", invertInit, invertGetFrame, invertFree, fmParallel, 0, data, core);
And donít forget to check out my previous post with suggested tasks if you want to help out.

Posted in VapourSynth


R14 Ė Improved Packaging
Posted on October 30, 2012
Itís time for another release. The main highlights are bug fixes and the possibility to set the max cache size. The default max is 1GB everywhere to prevent running out of address space in 32bit applications. Iíve also decided to start bundling some potentially useful filters:

TemporalSoften Ė C code restored from inline asm
Histogram Ė with support for higher bitdepths in the default mode
VIVTC Ė think TIVTC but less features and portable
EEDI3 Ė improved to work on all 8bit formats
Since this projectís success depends a lot on good plugins being available Iíve also included all files needed to start developing in the installer. Just check out the SDK directory and the example invert filter to get started.

Itís now time for me to start spending more time porting/rewriting some useful Avisynth thingsÖ

Posted in VapourSynth


R13 Ė Conditional Filtering and Memory Optimizations
Posted on October 15, 2012
Itís time for another release since itís been over a week. The new things are a redone system for accessing frame properties and this time itís less awkward and arcane, the possibility to write a full filter in python only (if youíre clever enough to figure out how to abuse ModifyFrame) and the memory management has been enabled. This means that VapourSynth will aggressively try to keep the amount of used framebuffer memory below 1GB to avoid running out of address space.

I also added all useful internal Avisynth filters turned into a standalone plugin to the downloads. It should make the transition to VapourSynth easier while waiting for your favorite internal filter to be ported. If your favorite filter happens to be a simple one I suggest you give porting it a try yourself.

As I feel the core is almost complete now I will focus on creating more automated regression tests, documentation everything and tweaking the automatic cache size adjustment for the next release. Phase one of the project is nearing the end. After that I will focus on porting popular filters properly, as in making them work on Windows, Linux and OSX in both 32 and 64bit mode. As some of you may have noticed Iíve already ported EEDI3 and Iím currently working on TIVTC, a difficult project (but not for the right reasons) which Iíll write another post about.

Posted in VapourSynth


R12 Ė VapourSynth Takes a Step in The Enterprise Direction
Posted on October 5, 2012
This new version has something for everyone. It has a round of bug fixes, one of them to the threading which means that it should be able to completely max out a 4 core CPU when running mdegrain2. The other features (requested through donations) are support for v210 output, the most used 10 bit format in professional video editing. To enable this output in VSFS and VFW add this to your script:

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last = yourvideo
enable_v210=True
If you do not add it the output will default to P210. The documentation will be updated later today with more detailed installation instructions for VSFS. For those of you who canít wait the install method is very similar to AVFS (just look for vsfs.dll).

Posted in VapourSynth


R11 Ė VFW returns and Python 3.3
Posted on October 1, 2012
VFW has been debugged. Greatly. Iíve also added high bitdepth output support. However v210 shall be left out (I hate packed formats) unless someone contributes a patch or requests it in a donation message. VFW also has some behavioral changes such as returning a clip with colorful bars on error. This version also requires the Python 3.3 as this cuts down on the number of copies of visual studio I have to keep around.

Note that it is possible and quite easy to recompile the python and VFW modules for other versions. Maybe someone will contribute a python 2.7 compile one day.

Posted in VapourSynth


R10 Ė VFW enters the scene from the left
Posted on September 29, 2012
Another few days have passed and the VFW module is now ready for a first test out in reality. It supports all the same output formats as Avisynth 2.6 plus one more! (which you will probably never use) I have decided that the official extension for these virtual avi scripts should be .vpy. Think Video PYthon script to remember it. It was the best I could come up with that wasnít used by something else as well. The VFW part has been tested with AVISource in Avisynth, MPC-HC and VirtualDub. Out of these VirtualDub is the only one that needs a small workaround since it detects the special compatibility mode based on file extension, you MUST SELECT the compat option in the FileOpen dialog or it wonít open.

Of course thereís also a bunch of other changes such an installer that comes with all the needed runtimes, the usual pile of Python module fixes and other things. Release early, Release often as the saying goes. My schedule is to try to make a new release every time I cross off something on the todo list.

I have also added a donation button. At least consider using it. Click on it once and then quickly close the window if you donít want to donate anything. I will however never threaten to stop the project or anything else thatís close to drama if donations are low.



Posted in VapourSynth


R9 Ė the mostly done release
Posted on September 26, 2012
This is the big release. The new things are:

Full documentation of all the included functions
The full source released as LGPL
Fixes bugs in most of the internal filters
Adds Python + operator and slicing support to clips
Fully working on linux (and probably osx too if you want to try compiling there)
Many other small things like more fixes to y4m output
With this release I consider the API stable and the core mostly feature complete. So start writing and porting plugins!

Whatís next on the todo list (in no particular order):

Write a masktools replacement (probably with asmjit)
Write a general subtitling plugin, something like AssRender for Avisynth
Figure out what to do about the horrible resizers
Write a vfw module
Make it possible to write full plugins and not just functions in Python
Document the C API and make a small example of how to write an Invert filter
Other stuff


Posted in VapourSynth


R8 Ė The sad interim release with some bugfixes
Posted on September 20, 2012
The title says it all, I hoped to have a bit more ready but this is at least a bit over halfway to my stated goals.

The big news is the addition of a function type. This allows some interesting things like this:

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def selector1(sdict):
a = sdict['N']
a = a % 2
b = {'val':a}
# return the index of the clip to select
return b

def selector2(sdict):
# for these functions the key 'N' holds the requested frame number
# and FX corresponds to the index of the frames
frame_properties = get_props(sdict['F0'])
if frame_properties['SomeFrameProperty'] < 0.5:
return {'val':0}
else:
return {'val':1}

# some source for clip0 and clip1 here
ret = core.std.SelectClip(clips=[clip0, clip1], src=[clip0], selector=selector1)

# ret will now return every other frame from clip0 and clip1 interleaved

# selector2 shows how frame properties can be factored into it
Posted in VapourSynth


R7 Ė the source is slowly coming
Posted on September 12, 2012
After almost 2 weeks of rapid improvement R7 is done. It mostly introduces more improvements for the python module, which now accepts unnamed arguments and has improved y4m output. The most important detail being the addition of a B value to the y4m header so it can signal higher bitdepths automatically too. Since itís a minor change I hope x264, libav and other tools will adopt this property soon.

Another new thing that may interest some of you is that this build also comes with the header for developing your own plugins plus a the full source for all the functions in the std namespace (MIT licensed). I still have a few more things I want to add and revise before releasing the rest of the source to the public.

So instead of giving an vague ďsoonĒ as a release schedule for the source I will simply give you a list of things I want to finish before it goes out the door:

Decide which license to release it under. (discuss it if you want but Iím tilting towards something like free for non-commercial use, source modifications must be shared)
The addition of a function type. This is mostly for internal use as python handles callable objects well enough.
The ability to write whole filters in python. It would make quick prototyping easy and open up filter writing for more people (unfortunately python itself has one huge mutex called the GIL so if itís used too much it could lead to serious slowdowns).
More checks, one of the most important things in my opinion is to detect errors early and report them. Especially for developers. The core already has a lot of checks in its handling of external plugins so new plugin writers will become aware of their mistakes.
Finish the standard functions. The main missing functions are Transpose, CropRel and several small ones for property manipulation and per frame selection.
Maybe Iíll reveal the long term goals next time.

Posted in VapourSynth


R2 is here
Posted on September 5, 2012
This time the release should be mostly usable for real encoding. Try it and report any crashes and avisynth plugin compatibility.

Posted in VapourSynth

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All features / Full description:
The main features compared to Avisynth are:

Multithreaded Ė Frame level multithreading
Generalized Colorspaces Ė New Colorspaces can be specified at runtime
Per Frame Properties Ė Additional metadata can be attached to frames
Python Based Ė The scripting part is implemented as a Python module so you donít have have to learn a special language
Support for video with format changes Ė Some video just canít stick to one format or frame size VapourSynth can handle any kind of change


Alternative to VapourSynth:
Avisynth



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