#5936: Colored haze in mpeg4 decoding (purple, yellow,...)
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Reporter: te36 | Owner:
Type: defect | Status: closed
Priority: important | Component: avcodec
Version: git-master | Resolution: fixed
Keywords: asp | Blocked By:
regression | Reproduced by developer: 1
Blocking: |
Analyzed by developer: 0 |
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Comment (by te36):
To reproduce "OK" encoding with the haze problem.
Re-encode example clip with fixed ffmpeg version, eg: to mpeg2.
Re-encode with mencoder 1.2.1:
mencoder-1.2.1 -ovc lavc -lavcopts vcodec=mpeg4:vbitrate=1500:ildct:ilme
-o purple-haze-bug-mencoder.avi purple-haze-bug.ts
produces the same large haze areas. This version of mencoder uses
Lavc54.23.100
Re-encode instead directly with Lavc54.23.100:
ffmpeg-lavc-54.23.100 -i purple-haze-bug.ts -vcodec mpeg4 -flags
+ildct+ilme -b:v 1500k purple-haze-bug-ffmpeg.avi
produces some small amount of haze on the edges but they don't tear
across the whole picture. Maybe mencoder feeds some other parameters into
lavc mpeg4 encoding.
Recent versions of ffmpeg/mencoder do not produce visible haze anymore
using the same encoding example.
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Ticket URL: <https://trac.ffmpeg.org/ticket/5936#comment:12>
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