[FFmpeg-trac] #7510(undetermined:new): Streamcopy of private stream produces empty output

[FFmpeg]

#7510: Streamcopy of private stream produces empty output
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             Reporter:  msiders      |                    Owner:
                 Type:  defect       |                   Status:  new
             Priority:  normal       |                Component:
              Version:  git-master   |  undetermined
             Keywords:               |               Resolution:
             Blocking:               |               Blocked By:
Analyzed by developer:  0            |  Reproduced by developer:  0
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Comment (by msiders):

 Hi,

 Futhermore, the parameter `-copy_unknown` only works with streams with
 type AVMEDIA_TYPE_UNKNOWN as you can see in the source code:
 https://github.com/FFmpeg/FFmpeg/blob/d702769213487923c0fb0abe4b61f4d9ebddb88b/fftools/ffmpeg_opt.c#L2294

 But, the stream that I need to copy is detected as AVMEDIA_TYPE_DATA. But
 not writed in the output.

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Ticket URL: <https://trac.ffmpeg.org/ticket/7510#comment:4>
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