[FFmpeg-trac] #6217(ffmpeg:new): Ffmpeg ignores bitrate parameter when encoding with libxvid at 2nd pass

FFmpeg trac at avcodec.org
Sat Mar 25 17:05:13 EET 2017


#6217: Ffmpeg ignores bitrate parameter when encoding with libxvid at 2nd pass
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             Reporter:  danieldc     |                    Owner:
                 Type:  defect       |                   Status:  new
             Priority:  normal       |                Component:  ffmpeg
              Version:  unspecified  |               Resolution:
             Keywords:  ffmpeg       |               Blocked By:
  libxvid dual pass                  |  Reproduced by developer:  0
             Blocking:               |
Analyzed by developer:  0            |
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Comment (by edumj):

 And it gets worse without -g 250 (using default gop size and bitrate
 1500k, results in 2617k! with a maxium Peak of 19524k!!):

 libxvid 1500k 2 Pass -g 250 -> Bitrate 1917k!  and Peak 18793k!
 libxvid 1500k 2 Pass (-g 12)-> Bitrate 2617k!! and Peak 19524k!

 But, only with 1 pass and a normal gop of 250, it doesn't reach desired
 bitrate at all:

 libxvid 2000k 1 Pass -g 250 -> Bitrate 1572k!
 libxvid 2000k 1 Pass (-g 12) -> Bitrate 1969k

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Ticket URL: <https://trac.ffmpeg.org/ticket/6217#comment:2>
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