[FFmpeg-user] backtrack parameters from existing file

[Henk D. Schoneveld]

On Jan 8, 2013, at 10:07 PM, Scott Goldman <scottg at emailhosting.com> wrote:

>>  ----- Original Message -----From: "Scott Goldman"
> <scottg at emailhosting.com> Sent: Fri, January 4, 2013 20:26Subject:
> [FFmpeg-user] backtrack parameters from existing file
>> Greetings,
>> Is there anyway that ffmpeg can look at an existing video file and provide
>> the switches used to create that fiile - or at worst case, provide
>> switches to create similar output?>
> 
>> We are trying to use ffmpeg to transcode to mp4 and need to match
>> quality/bitrate/etc of an existing file as close as possible.
>> 
>> Thanks in advance
>> Scott
> 
> 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.  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.
ffmpeg -r 29.97 -i somefile.ext -c:v libx264 codecoptions -c:a …. -r 29.97 output.ext probably will solve it.
> 
> the bottom line is how do i get ffmpeg to either disregard the wrapper or
> get it to slo-mo the output..
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