The MP4 source reported the sample entry's size, only swapped for the display rotation, so two
crops were lost: the codec's own (H.264 SPS frame cropping, HEVC conformance window), which the
decoder applies but the reported size and sequences made from the clip didn't, and the clean
aperture (`clap`), parsed but never used. An iPhone clip (1920x1440 coded, 1744x1308 clean
aperture, -90 degree display matrix) showed 1440x1920 instead of 1308x1744.
H.264 / HEVC sizes now come from the stream's parameter sets; the clean aperture is a rectangle
inside that picture (ignored when it makes no sense), reported as the size and cut from every
frame by the GOP cache before the display rotation, through the new VideoFrame::cropped.
Tests: bit-exact against ffmpeg (which applies both crops) for an H.264 SPS crop, an HEVC
conformance window, centred and off-centre clean apertures and a clean aperture with a rotation;
clean apertures that make no sense are ignored without a panic; VideoFrame::cropped on every pixel
format with odd sizes and misaligned corners.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
MrCloudy2andClaude Opus 5.5
e90508f16f