Write AVI files: hdrl with avih and one strl (strh, strf, strn, indx) per
stream, odml/dmlh, an interleaved movi and idx1. Past the RIFF limit
(default 1 GiB) the file continues in OpenDML RIFF AVIX extensions with
ix## standard indexes and an indx super index per stream.
- VideoSpec::for_codec builds the stream from CodecParams; MPEG-4 Part 2
is tagged FMP4.
- Audio is timed by bytes (PCM-style) or one packet per chunk.
- Bad options and chunks are errors; finish() closes a readable file
after a failed write.
Tests read the files back through this crate's demuxer by every index,
and through ffmpeg (decode identical to the sources, seeks through the
index, ffprobe fields), in one RIFF and across AVIX extensions. The
MPEG-4 encoder tests play its packets from an AVI file.
* 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.
---------
Co-authored-by: alehel <git@ornumhelgaker.no>
alehel