[FFmpeg-trac] #8210(undetermined:new): Header Compression Issue ProRes MKV to MOV

FFmpeg trac at avcodec.org
Sat Sep 28 18:39:19 EEST 2019

#8210: Header Compression Issue ProRes MKV to MOV
             Reporter:               |                    Owner:
  frankiejones                       |
                 Type:  defect       |                   Status:  new
             Priority:  normal       |                Component:
                                     |  undetermined
              Version:  git-master   |               Resolution:
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |

Comment (by mkver):

 I have a guess to why this is happening: When FFmpeg's Matroska demuxer
 inverts the header stripping, it writes the size of the actual payload
 (i.e. the size of the frame as it is in Matroska) into the in-band length
 field. But in the mp4/mov world, said length field usually does not
 contain the size of the payload only, but of the whole atom (i.e.
 including the size field and the atom tag). So it might be that the
 internal size field is short by eight bytes. I will produce files for you
 to test in Premiere.

Ticket URL: <https://trac.ffmpeg.org/ticket/8210#comment:2>
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