FFmpeg

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Andreas Rheinhardt 0401ca714a avcodec/asvenc: Don't waste bits encoding non-visible part

Up until now, the encoder replicated all the border pixels
for incomplete 16x16 macroblocks. In case the available width
or height is <= 8, some of the luma blocks of the MB
do not correspond to actual input, so that we should encode
them using the least amount of bits. Zeroing the block coefficients
(as this commit does) achieves this, replicating the pixels
and performing an FDCT does not.

This commit also removes the frame copying code for insufficiently
aligned dimensions.

The vsynth3-asv[12] FATE tests use a 34x34 input file and are
therefore affected by this. As the ref updates show, the size
and checksum of the encoded changes, yet the decoded output
stays the same.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>

2025-05-26 03:37:09 +02:00