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Aleksander Helgaker 77a3ddbf26 craft-video: MPEG-4 Part 2 (Xvid/DivX) Simple profile encoder

* craft-video: MPEG-4 Part 2 Simple profile encoder

Adds a clean-room MPEG-4 Visual (ISO/IEC 14496-2) encoder behind the new
`mpeg4` / `mpeg4-encode` features: the stream type Xvid and DivX write,
which craft-media already identifies (CodecId::Mpeg4Video) in MP4, Matroska,
AVI and MXF but which no crate could produce.

- I- and P-VOPs, 4:2:0 8-bit, H.263 quantisation, half-sample motion with a
  predictor-seeded diamond search, skipped and intra macroblocks in P-VOPs,
  intra refresh within the 132 codings of §7.4.5.
- Constant quantiser or 1-pass average bitrate.
- Headers in band (raw .m4v, AVI) or as extradata / CodecParams (MP4, Matroska).

Tests use ffmpeg/ffprobe as external decoders: every coefficient table entry
and escape mode 1/2 event decodes like the fixed-length escape, and encoded
streams decode without diagnostics, close to the encoder's reconstruction.

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Co-authored-by: alehel <git@ornumhelgaker.no>

2026-11-12 09:11:48 -05:00

apv

craft-video: APV decoder and encoder from FilmCraft (apv) (#865 )

2026-11-11 17:26:22 -05:00

av1

craft-video: AV1 and HEVC take the colour description; AV1 motion search from EffectCraft (#829 )

2026-11-11 16:40:32 -05:00

av1_decode

craft-video: AV1 decoder from FilmCraft, with DeckCraft's hardening (av1-decode) (#836 )

2026-11-11 17:43:10 -05:00

dnx

craft-video: the DNx decoder refuses repeated or decreasing scan-line offsets (port of filmcraft #4101 ) (#833 )