fmtconv/Avisynth+: resize, bitdepth and colorspace conversions

[cretindesalpes]

I just ported my fmtconv Vapoursynth plug-in to Avisynth+.

>>> fmtconv-r30.zip <<<

Fmtconv is a format-conversion plug-in for the Vapoursynth and Avisynth+ video processing engines. It does:

• Resizing and convolution.
• Bitdepth conversion with dithering.
• Colorspace conversion (matrix, transfer characteristics and chromatic adaptation).

Supports:

• 8-–12-, 14- and 16-bit integer, 32-bit float
• Colorspaces: RGB, Y, YUV, YCoCg, YDzDx and ICtCp in 4:4:4, 4:2:2, 4:2:0 and 4:1:1 chroma subsampling factors.
• Progressive and interlaced content.

Fmtconv is focussed primarily on quality and exactness rather than execution speed. This does not mean it is slow or unoptimized, but fmtconv is clearly not on par with the fastest equivalent 8-bit filters.

The full documentation is included in the zip file.

Source code is also available as Git repository.

Please note:

• This plug-in will work only in Avisynth+ (v3.7.0 and above), not in regular Avisynth, because it makes extensive use of the new high-bitdepth colorspaces. Stack-16 format is not supported.
• Fmtconv is not internally threaded at the moment (excepted resample that can use AVSTP), but could be if there is a real need. All the functions support the MT_NICE_FILTER multi-treaded mode. Enabling multi-threading is currently not automatic, you have to activate it from your scripts with SetFilterMTMode and use the Prefetch function at the right location. This may change later.
• 32-bit version is strongly discouraged. I may remove it completely in the future.
• The whole thing is complex and testing every parameter combination is impossible. The core functionalities work and have been tested for several years with Vapoursynth, but the Avs+ interface is new and may have related issue. Please report here anything suspicious, I’ll try to fix it as soon as possible.
• Documentation lacks examples for Avs+, but this will come later.