#5732: Display corruption on very high-bitrate H.264 files
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Reporter: Sesse | Owner:
Type: defect | Status: open
Priority: minor | Component: avcodec
Version: git-master | Resolution:
Keywords: h264 | Blocked By:
Blocking: | Reproduced by developer: 1
Analyzed by developer: 0 |
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Comment (by Sesse):
I compiled x264 from git as today, and compiled ffmpeg against it. I then
ran
{{{
ffmpeg -hwaccel vaapi -ss 12:00 -vaapi_device :0 -i through-the-cracks.mp4
-c:v libx264 -qp 20 -preset medium test2.mp4
}}}
which hopefully should be comparable in quality.
The file produced was actually _larger_ than the QSV one (1892 MB for QSV,
2105 MB for x264). And x264 is of course much, much slower; on my dual-
core Haswell i7 laptop, eating all the CPU, overall speed was 0.201x
realtime (and there are some easy sections in the beginning). For
comparison, QSV on the same machine was 2.16x realtime.
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Ticket URL: <https://trac.ffmpeg.org/ticket/5732#comment:20>
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