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

FFmpeg trac at avcodec.org
Tue Mar 28 03:24:14 EEST 2017


#6217: Ffmpeg ignores bitrate parameter when encoding with libxvid at 2nd pass
-------------------------------------+-------------------------------------
             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            |
-------------------------------------+-------------------------------------

Comment (by edumj):

 Well, 2014 versions also lacks bitrate enforcement with 2 pass, but there
 was no such great difference between desired bitrate and the resulting
 one:

 libxvid (2017) 1.111k 2 pass (-g 12) -> Bitrate 2.875k!! and Peak
 23.133k!!!!
 libxvid (2014) 1.111k 2 pass (-g 12) -> Bitrate 1.466k! and Peak 9.671k


 And, with a gop of 250:

 libxvid (2017) 1.111k 2 pass -g 250 -> Bitrate 2.201k!! and Peak
 22.937k!!!!
 libxvid (2014) 1.111k 2 pass -g 250 -> Bitrate 1.283k! and Peak 11.854k!


 Also, any ideas how to control maximum bitrate peaks?

 Thanks.

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Ticket URL: <https://trac.ffmpeg.org/ticket/6217#comment:3>
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