[FFmpeg-trac] #11127(avcodec:new): FFV1 sometimes encodes invalid values for "ec" (CRC error detection/correction) header parameter field when using 2-pass encoding

[FFmpeg]

#11127: FFV1 sometimes encodes invalid values for "ec" (CRC error
detection/correction) header parameter field when using 2-pass encoding
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             Reporter:  James        |                    Owner:  (none)
  Johnston                           |
                 Type:  defect       |                   Status:  new
             Priority:  normal       |                Component:  avcodec
              Version:  unspecified  |               Resolution:
             Keywords:  FFV1 ffv1    |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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Comment (by James Johnston):

 I attached an example MKV file that has the problem.  It was created from
 a 65 GB file with the same problem, encoded using the 2-pass commands seen
 in the issue description, using the following command:

 {{{
 ffmpeg -t 0.25 -i input.mkv -c copy truncated.mkv
 }}}
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Ticket URL: <https://trac.ffmpeg.org/ticket/11127#comment:1>
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