[FFmpeg-user] backtrack parameters from existing file
Carl Eugen Hoyos
cehoyos at ag.or.at
Tue Jan 8 23:23:03 CET 2013
Scott Goldman <scottg <at> emailhosting.com> writes:
> So i've discovered what my issue really is. I'm trying to transcode from
> an MXF file created by QUANTEL 3.6. This version of their power portal
> incorrectly set the edit rate as 59.97 but is in really 29.97. so my
> transcode is running at double speed.
Please provide a sample if this is reproducible with FFmpeg.
> I would like to use the -r 29.97
> before the -i, but that doesnt work and when i add -force_fps -r 29.97,
> ffmpeg reports Option framerate not found.
This is a (common) misunderstanding:
MPlayer used to rely on the framerate to calculate
timestamps, FFmpeg mostly only provides the frame-rate
for informational purpose (there are exceptions, but
mxf is not one of them).
Or in other words: You cannot fix this problem by
providing an option, please test ffmpeg and if
it fails, please provide complete, uncut
console output (and a sample).
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