[FFmpeg-user] Unable to change time base / tbn

landsberger at free.fr landsberger at free.fr
Mon Dec 29 00:37:33 CET 2014

I am looking for a way to modify the time base (tbn value) with FFMPEG.

My source file is a Quicktime containing the following streams:

Stream #0:0(eng): Audio: pcm_s16le (sowt / 0x74776F73), 48000 Hz, stereo, s16, 1536 kb/s (default)
Stream #0:2(eng): Video: dvvideo (dvcp / 0x70637664), yuv420p, 720x576 [SAR 16:15 DAR 4:3], 28800 kb/s, SAR 12:11 DAR 15:11, 25 fps, 25 tbr, 12800 tbn, 25 tbc (default)

I have tried a filter:
ffmpeg -i inputfile -r 25 -vf settb=1/25 -acodec copy -vcodec copy output

But the output file still has a tbn of 12800. And there is no specific error message from FFMPEG.

I need to change the tbn because to make it optimal for an editing system like Final Cut Pro. Any suggestions very welcome!

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