[FFmpeg-trac] #4780(undetermined:new): FFMpeg ignores the logfile of first pass when encoding through libxvid

[FFmpeg]

#4780: FFMpeg ignores the logfile of first pass when encoding through libxvid
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             Reporter:  academic     |                    Owner:
                 Type:  defect       |                   Status:  new
             Priority:  important    |                Component:
              Version:  git-master   |  undetermined
             Keywords:  passlogfile  |               Resolution:
  libxvid regression                 |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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Comment (by academic):

 My English is pretty bad, but if we have such command lines:

 {{{
 $ ffmpeg -f lavfi -i testsrc -vcodec libxvid -vb 80k -g 250 -pass 1
 -passlogfile log.pass -t 600 -y out1.avi
 $ ffmpeg -f lavfi -i testsrc -vcodec libxvid -vb 80k -g 250 -pass 2
 -passlogfile log.pass -t 600 -y out1.avi
 }}}
 we get on ffmpeg version N-74131-g9ec17e4 bitrate 88k, which is correct,
 but on ffmpeg version N-74179-g9dcaae7 or higher we get bitrate 153k. I
 also can see, that FFMpeg opens a log file and reads it to the end in tho
 theese versions. But in new versions bitrate is significantly higher than
 what we have specified.

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Ticket URL: <https://trac.ffmpeg.org/ticket/4780#comment:2>
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