[FFmpeg-trac] #3091(undetermined:new): High Bitrate I-frame CBR MPEG encoding causes error

FFmpeg trac at avcodec.org
Wed Oct 30 05:35:47 CET 2013

#3091: High Bitrate I-frame CBR MPEG encoding causes error
             Reporter:  ortoni       |                    Owner:
                 Type:  defect       |                   Status:  new
             Priority:  normal       |                Component:
              Version:  unspecified  |  undetermined
             Keywords:               |               Resolution:
             Blocking:               |               Blocked By:
Analyzed by developer:  0            |  Reproduced by developer:  0

Comment (by ortoni):

 The difficulty with adding a -bt flag (10M seems to work)  is that the
 stream is then marked as VBR instead of CBR, and the encoded frames are no
 longer the expected constant size. The actual encoded size I worked out to
 be max about 100Mbit/sec. The aim is to achieve a CBR I frame encoding
 similar to IMX.

 I guess if the -bt default were to scale with bitrate, that would make
 sense, as then the resulting bitstream would be constant frame size and
 marked as CBR(?)

Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/3091#comment:4>
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