[FFmpeg-trac] #6163(undetermined:closed): concat demuxer produces invalid output with frame-held mp4

[FFmpeg]

#6163: concat demuxer produces invalid output with frame-held mp4
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             Reporter:               |                    Owner:
  JohnHawkinson                      |                   Status:  closed
                 Type:  defect       |                Component:
             Priority:  normal       |  undetermined
              Version:  git-master   |               Resolution:  invalid
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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Comment (by JohnHawkinson):

 Replying to [comment:6 cehoyos]:
 > I didn't remember but this is documented in https://ffmpeg.org/ffmpeg-
 all.html#Advanced-Video-options
 >
 > If there is another issue, please open a new ticket.

 Err, you mean the fact that `-pix_fmt +yuv420p` produces

   The filters 'Parsed_null_0' and 'format' do not have a common format and
 automatic conversion is disabled.
   Error opening filters!

 because that page says

    . If pix_fmt is prefixed by a +, ffmpeg will exit with an error if the
 requested pixel format can not be selected, and automatic conversions
 inside filtergraphs are disabled. If pix_fmt is a single +, ffmpeg selects
 the same pixel format as the input (or graph output) and automatic
 conversions are disabled.


 ?

 That wasn't really the point of the defect. I'll open a new ticket since
 you requested it, but it's going to just be information that's already in
 this one.

 Note that the error message you get from the above ("do not have common
 format") is not particularly clear that it is related to pixel format
 selection, and also the "Parsed_null_0" isn't very clear on meaning.

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Ticket URL: <https://trac.ffmpeg.org/ticket/6163#comment:8>
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