ffmpeg -framerate 25 -start_number 1 -i IMG_%4d.jpg
-codec:v mpeg4 output.mp4
Please understand that you are expected to always
post your command line including the complete,
uncut console output on this mailing list.

The above command line does exactly what it's supposed to do.
Let's assume I have 250 input pictures. With framerate 25, the video length is 10 seconds.

Related question: Can ffmpeg make a video faster or slower, while keeping the framerate the same as before?

Michael

--
**********************************************
  ASTRO ELECTRONIC   Dipl.-Ing. Michael Koch
       Raabestr. 43   37412 Herzberg
          www.astro-electronic.de
  Tel. +49 5521 854265   Fax +49 5521 854266
**********************************************

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