From: "Ignacy Gawędzki" <bugs@qult.net>
To: ffmpeg-devel@ffmpeg.org
Subject: [FFmpeg-devel] [PATCH 0/1] Fix tmix on discontinuities
Date: Sun, 6 Jul 2025 20:30:09 +0200
Message-ID: <b333lxheuvy6iadew3tuxv4xxas4wjrwhjhgmmkt4g43fdlvaz@3tzna4uyb4yo> (raw)
A simple example of the bug:
ffplay -f lavfi color=c=gray -vf 'tmix=enable=gt(t\,1)'
After one second, the color is wrong (green in my case), not the
expected gray.
It seems it is due to the fact that parse_weights determines that
the weights are all 1 and FAST_TMIX_SLICE should be used instead of
MIX_SLICE. But if the filter is not running from the very start with
these weights, FAST_TMIX_SLICE will not work properly.
Besides, should FAST_TMIX_SLICE not be used with float types either,
as addition on floats is not associative and rounding errors will
accumulate?
Ignacy Gawędzki (1):
avfilter/f_mix: disable fast on discontinuities
libavfilter/vf_mix.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
--
2.48.1
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reply other threads:[~2025-07-06 19:14 UTC|newest]
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