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

[FFmpeg]

#3091: High Bitrate I-frame CBR MPEG encoding causes error
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             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
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Comment (by ortoni):

 I could not get -b:v 150M -minrate 150M -bt 6M to work - still had
 "bitrate tolerance too small.." [maxrate and bufsize removed]

 Increasing -bt: -b:v 150M -minrate 150M -bt 8M was allowed but m2v
 sequence header says BR = 104,857,200, with sequence length (i.e. #
 bits/frame) variable, vbv bufsize was 15,138,816. MediaInfo calculated the
 bitrate as 45.6Mbps.

 Adding -maxrate and bufsize: -b:v 150M -minrate 150M -maxrate 150M -bt 8M
 -bufsize 47185920, m2v seq HDR now says BR=45,142,400, sequence length is
 constant, vbv bufsize is 13,631,488 and MediaInfo says "overall bitrate
 149Mb/s" but Maximum Bitrate is 46.8Mbps

 All tests on same git as original; and I'm very confused!

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Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/3091#comment:6>
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