[FFmpeg-user] Setting the default input framerate in conjunction with -f concat -i filelist.txt

Carl Eugen Hoyos ceffmpeg at gmail.com
Sat Aug 19 12:47:07 EEST 2017

2017-08-18 23:34 GMT+02:00 Davide <davide.denardis at gmail.com>:
> Dear you all,
> I am trying to set the input framerate of a sequence of images:
> if I am working with a single image sequence everything works properly:
> *ffmpeg -framerate 30 -i folder01/img%05d.jpeg ......*
> then, because I have more folders

> (and I was unable to get the -i
> concat:filesequence1|filesequence2 working)

Please elaborate, if the mjpeg demuxer is not
autodetected, force jpeg pipe with "-f jpeg_pipe".
(Or are these different files, not just jpeg?)

> I tried to use:
> *ffmpeg -framerate 30 -f concat -safe 0 -i filelist.txt .....
> *but I receive a:
> *Option framerate not found.
> *then if I omit the "-framerate 30", everything runs smoothly, but ffmpeg
> defaults to a 25 fps value for the input image sequences.
> Any ideas on how to fix this?

You are describing a missing feature, the concat demuxer does
not allow to forward options to the actual demuxers.

Carl Eugen

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