[FFmpeg-trac] #9210(undetermined:new): Concat images produces wrong timings when duration is in milliseconds

[FFmpeg]

#9210: Concat images produces wrong timings when duration is in milliseconds
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             Reporter:  demet64      |                    Owner:  (none)
                 Type:  defect       |                   Status:  new
             Priority:  normal       |                Component:
                                     |  undetermined
              Version:  unspecified  |               Resolution:
             Keywords:  concat       |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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Comment (by Nicolas George):

 Replying to [comment:7 Andre LaBranche]:
 > The unwanted 25 fps does seem to be coming from `concat`. I tested that
 along with `image2` and found that `image2` honors the frame rate passed
 as a cli option.

 image2 honors the `frame_rate` option, but you never gave that option to
 the `image2` instances below the concat demuxer.

 I would not oppose a patch to concat to add a `time_base` option.
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Ticket URL: <https://trac.ffmpeg.org/ticket/9210#comment:8>
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