Software » Useful Tools » AviSynth+ 3.7.5 / 3.7.6 Beta

Avisynth+ v3.7.6pre-r4565 test build Pre-release
20260328 3.7.5.r4565 (pre 3.7.6)
Add ColorbarsUHD https://avisynthplus.readthedocs.io/en/latest/avisynthdoc/corefilters/colorbarsuhd.html
Fix: LruCache self-tuning cache resize: raised ghost-hit threshold from ghosted>0 to ghosted>1,
preventing unbounded cache growth during backward seeking (Issue AviSynth#379) and Bob/SeparateFields
access patterns (Issue AviSynth#270).
Fix: VideoFrame::Release() race condition in frame property cleanup under multi-threaded use
(stability fix for static-frame sources such as ColorBars, BlankClip).
Histogram "color"/"color2": add targets100 parameter: the 6 ColorBars target boxes at 100% luma scale.
Fix: YUV<->RGB conversion with quality=true at 10-14 bit sources (regression).
Fix: Histogram "color"/"color2": "target" parameter no longer acts as master switch for "axes".

Avisynth+ v3.7.6pre-r4554 test build Pre-release
20260307 3.7.5.r4554 (pre 3.7.6)
Fix: Working 'quality' parameter for 10-14 bits sources in YUV<->RGB conversions (was: blackness)

Avisynth+ v3.7.6pre-r4551 test build Pre-release
20260306 3.7.5.r4551 (pre 3.7.6)
Reenable YUY2 in planar target conversions as source (disabled in r4549)
ConvertToY also gets bits and quality parameters, latter is used when source is RGB.

Avisynth+ v3.7.6pre-r4549 test build Pre-release
Avisynth Plus change log
Source: https://github.com/AviSynth/AviSynthPlus

This file contains all change log, with detailed examples and explanations.
The "rst" version of the documentation just lists changes in brief.
For online documentation check https://avisynthplus.readthedocs.io/en/latest/

Actual:
https://avisynthplus.readthedocs.io/en/latest/avisynthdoc/changelist376.html

20260305 3.7.5.r4549 (pre 3.7.6)
Fix: memory leak in Subframe/MakePropertyWritable after static-frame sources (ColorBars, BlankClip)
any->YUV conversions (See https://avisynthplus.readthedocs.io/en/latest/avisynthdoc/corefilters/convert.html`.
accept bits ans quality parameters, similar to ConvertToPlanarRGB
the legacy 8-bit-named functions (ConvertToYV12, ConvertToYV16, ConvertToYV24) allowing high-depth sources.
"ConvertToYUY2": rewritten to route all conversions through YV16.
"ConvertToYUY2": ChromaOutPlacement parameter added (was missing, present in ConvertToYV16).
"ConvertBackToYUY2": kept for backward compatibility; now forwards to ConvertToYUY2. The pre-2.5 left-pixel-only chroma hack is no longer
needed or applied; the YV16 lossless repack path avoids chroma resampling loss entirely for roundtrip workflows.
8 bit packed RGB formats are converted to planar RGB before 444 conversion.
Utiliting the optimized and maintained planar RGB infrastructure
Fix: "ConvertToYUY2" / "ConvertToYV12": progressive YV12<->YUY2 conversion (use generic YV16/YV12 path)
Fix: "ConvertToYUY2": _ChromaLocation, _Matrix and _ColorRange
frame properties were not read from YV12 source frames and not written to YUY2 output frames
in the old legacy direct conversion path.
Fix: "ConvertToYUY2": SSE2 interlaced upsampling used wrong weighting direction, differing from the C reference implementation.
Update https://avisynthplus.readthedocs.io/en/latest/avisynthdoc/corefilters/convert.html`
matrix syntax
ConvertToYUY2
bits and quality parameters
Update Sampling https://avisynthplus.readthedocs.io/en/latest/avisynthdoc/advancedtopics/sampling.html with historical content notes
on legacy YUY2 handling.
Avisynth+ v3.7.6pre-r4529 test build Pre-release
Actual:
https://avisynthplus.readthedocs.io/en/latest/avisynthdoc/changelist376.html

20260220 3.7.5.r4529 (pre 3.7.6)
Fix Colorbars inaccurate 10+ bit, by using ground truth linear RGB, similarly to ColorBarsHD.
Full refactoring.
update doc: https://avisynthplus.readthedocs.io/en/latest/avisynthdoc/corefilters/colorbars.html
Histogram "color" and "color2" (Vectorscope modes)
full refactoring.
Drawing is now matrix and color range aware. target positions (75%) +-I and +Q.
add individual overlay options:
added matrix, graticule, targets, axes, iq, iq_lines, circle
parameters
Fix: copy alpha from clip, initialize alpha to zero in the histogram area.
Accurate pixel positioning and scaling to the active histogram area,
limited/full range aware.
update doc: https://avisynthplus.readthedocs.io/en/latest/avisynthdoc/corefilters/histogram.html
20260216 3.7.5.r4523 (pre 3.7.6)
Fix r4504 regression YUV->RGBP bit-depth changing full-scale SSE2/AVX2 bug (exchanged G,B storage)
"Layer" YUV mul/add/subtract/lighten/darken: refactor chroma placement calculation, allowing SIMD optimization in the main frame processing
"Layer" YUV/RGBP mul/add/subtract/lighten/darken: refactor function dispatchers, add AVX2 path (LLVM/clangcl recommended)
Fix C-only vertical resampling code which added more rounding than needed (regression since pre-3.7.5 20250427)
Invert: per-plane processing for planar formats, use C even in AVX2, proper chroma inversion
New: AddAlphaPlane opacity parameter
New: ResetMask opacity parameter
rstdoc: document "opacity" in AddAlphaPlane and ResetMask
rstdoc: detail Layer "use_chroma" and opacity
Overlay "Blend": more speed, but keep accuracy, use float only where really needed
Layer: use YV16 internally for YUY2 (lessen source code bloat)

20260216 3.7.5.r4523 (pre 3.7.6)
Fix r4504 regression YUV->RGBP bit-depth changing full-scale SSE2/AVX2 bug (exchanged G,B storage)
"Layer" YUV mul/add/subtract/lighten/darken: refactor chroma placement calculation, allowing SIMD optimization in the main frame processing
"Layer" YUV/RGBP mul/add/subtract/lighten/darken: refactor function dispatchers, add AVX2 path (LLVM/clangcl recommended)
Fix C-only vertical resampling code which added more rounding than needed (regression since pre-3.7.5 20250427)
Invert: per-plane processing for planar formats, use C even in AVX2, proper chroma inversion
New: AddAlphaPlane opacity parameter
New: ResetMask opacity parameter
rstdoc: document "opacity" in AddAlphaPlane and ResetMask
rstdoc: detail Layer "use_chroma" and opacity
Overlay "Blend": more speed, but keep accuracy, use float only where really needed
Layer: use YV16 internally for YUY2 (lessen source bloat)
Avisynth+ v3.7.6pre-r4504 test build Pre-release
Actual:
https://avisynthplus.readthedocs.io/en/latest/avisynthdoc/changelist376.html

20260212 3.7.5.r4504 (pre 3.7.6)
Fix: inaccurate ColorBarsHD 10+ bit values. Now they are derived from the 32-bit float
RGB definitions instead of upscaling a 8 bit precalculated YUV value.
Add Ramp section the lead-in-lead-out.
Fix: GreyScale + SSE2 + RGB32 + matrix="RGB" overflow.
Rare usage; "RGB" matrix (Identity) uses a 1.0 coefficient which exceeds the signed 16-bit
SIMD limit of 32767 at 15-bit precision. Added bounds checking to fallback to C-code for any
coefficients >= 1.0 or < 1.0.
Fix: YUV->RGB limited range matrix accuracy for 10-16 bits.
Use a different rounding in matrix coefficient's integer approximation.
"ConvertToPlanarRGB": bits parameter: on-the-fly bit-depth conversions to YUV->RGB conversion.
Full range target: 8-16 bits internal calculation is in 32-bit float.
Limited range target: a quicker, bit accuracy optimized integer calculation path.
Not Fixed: Speed degradation when in-constructor GetFrame(0) (e.g. frame-property getter)
is used. Disable internal Cache object creation. Does not work in complex scripts, preparation
is 5-10 min instead of <1 sec. Investigation continues (Issue AviSynth#476: AviSynth#476)
Avoid MTGuard and CacheGuard creation if filter returns one of its clip parameter unaltered.
Add some avx2 stuff to Layer and Invert
Optimization: Overlay "Blend": aarch64 NEON optimization
20260203 3.7.5.r4483 (pre 3.7.6)
rst documentation update: RGBAdjust https://avisynthplus.readthedocs.io/en/latest/avisynthdoc/corefilters/adjust.html
rst documentation update: ColorYUV https://avisynthplus.readthedocs.io/en/latest/avisynthdoc/corefilters/coloryuv.html
optimization: add AVX2 TurnLeft/TurnRight/Turn180 (R/L: 1,5-3x speed).
optimization: ConvertBits AVX2 integer->float
optimization: ConvertToPlanarRGB(A): YUV->RGB add AVX2 (2-3x speed)
optimization: ConvertToPlanarRGB(A): YUV->RGB 16 bit: a quicker way (1,5x)
Fix: C version of 32-bit ConvertToPlanarRGB YUV->RGB to not clamp output RGB values.
ConvertToPlanarRGB(A): add bits parameter to alter target bit-depth.
ConvertToPlanarRGB(A): from YUV->RGB full range output: optimized in-process when bits=32, other cases call ConvertBits internally.
Fix: Packed RGB conversions altering the bit-depth (e.g. rgb32->ConvertToRGB64() worked always in full range.
Add more AVX512 resampler code. (WIP)
Add more AVX512_BASE code paths (Resamplers)
Build: add _avx512b.cpp/hpp pattern in CMake to detect source to compile with base (F,CD,BW,DQ,VL) flags.
However AVX512_BASE itself is set only when AVX512_FAST found.
For pre-Ice Lake (older AVX512) systems you can enable it with SetMaxCPU("avx512base+") and get the optimized AVX512_BASE functions.
Build: add new architecture z/Architecture

20260203 3.7.5.r4483 (pre 3.7.6)

rst documentation update: RGBAdjust https://avisynthplus.readthedocs.io/en/latest/avisynthdoc/corefilters/adjust.html
rst documentation update: ColorYUV https://avisynthplus.readthedocs.io/en/latest/avisynthdoc/corefilters/coloryuv.html
optimization: add AVX2 TurnLeft/TurnRight/Turn180 (R/L: 1,5-3x speed).
optimization: ConvertBits AVX2 integer->float
optimization: ConvertToPlanarRGB(A): YUV->RGB add AVX2 (2-3x speed)
optimization: ConvertToPlanarRGB(A): YUV->RGB 16 bit: a quicker way (1,5x)
Fix: C version of 32-bit ConvertToPlanarRGB YUV->RGB to not clamp output RGB values.
ConvertToPlanarRGB(A): add bits parameter to alter target bit-depth.
ConvertToPlanarRGB(A): from YUV->RGB full range output: optimized in-process when bits=32, other cases call ConvertBits internally.
Fix: Packed RGB conversions altering th...

Changes compared to AviSynth

64-bit version available
Faster script startup and substantially faster core filters
Support for multiple ("shadow") plugin directories
Autoloading of C-plugins
Script language extensions, with support for multiline conditionals and loops.
Improved still image support and TimeStretch

Developer features

Easy and fast compilation, with current compilers
2x increased compilation speed
Improved debugging experience
Leaner and more logical project structure
Large parts of the code refactored