#8871: swscale crops image on yuv2rgb
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Reporter: xlp | Owner: (none)
Type: defect | Status: new
Priority: normal | Component: swscale
Version: unspecified | Resolution:
Keywords: | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
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Comment (by Niklas Haas):
The problem here, and the reason it is not reproducible with just
`ffmpeg`, is that the dst buffer stride is not aligned to a multiple of 8,
which breaks the unscaled special converters.
This seems to fall into a general class of bugs revolving around calling
libswscale directly with unaligned buffers,
cf #6763, #10852, #6763
It seems that the only general fix to such issues is to either avoid the
use of asm entirely for unaligned buffers, or just print a big scary
warning and issue a memcpy from a suitably aligned internal buffer.
I am leaning towards the latter, as a definitive fix for these issues, all
of which have in common that they can only happen when one deliberately
ignores best practices around image buffer alignment.
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Ticket URL: <https://trac.ffmpeg.org/ticket/8871#comment:4>
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