[FFmpeg-trac] #6959(undetermined:new): Concat images only makes 3 frames with -filter_complex

FFmpeg trac at avcodec.org
Thu Jan 11 15:06:13 EET 2018

#6959: Concat images only makes 3 frames with -filter_complex
             Reporter:  mattaias     |                    Owner:
                 Type:  defect       |                   Status:  new
             Priority:  normal       |                Component:
              Version:  unspecified  |  undetermined
             Keywords:  concat       |               Resolution:
             Blocking:               |               Blocked By:
Analyzed by developer:  0            |  Reproduced by developer:  0

Comment (by cehoyos):

 Replying to [comment:2 mattaias]:
 > {{{
 > frame=    3 fps=0.0 q=-1.0 Lsize=     346kB time=00:00:00.00
 bitrate=46489311.5kbits/s dup=0 drop=8 speed=0.000115x
 > }}}
 This line tells you that your suspicion - that the concat filter ignores
 inputs above a certain threshold - is not true for your input: All 11
 frames came out of the filter chain, 8 had to be dropped because of the
 low output frame rate. To verify, you can set a higher framerate for the
 output file to avoid the dropped frames.

 My guess is that you expect every input frame to have a duration of 0.5
 seconds. Apart from the console output that already tells you that the
 duration of the input frames is very short: Why do you think so?
 Or do I misunderstand and you do not expect the input frames to have a
 longer duration?

 If I am right, `setpts` as last filter may result in the desired output
 file, see the documentation for usage examples.

Ticket URL: <https://trac.ffmpeg.org/ticket/6959#comment:3>
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