[FFmpeg-user] timecode_frame_start option has no effect

Clément Bœsch ubitux at gmail.com
Thu Aug 9 14:11:20 CEST 2012

On Thu, Aug 09, 2012 at 12:24:49PM +0200, bouke wrote:
> ----- Original Message ----- 
> From: "Werner Robitza" <werner.robitza at gmail.com>
> To: "FFmpeg user questions and RTFMs" <ffmpeg-user at ffmpeg.org>
> Sent: Thursday, August 09, 2012 10:47 AM
> Subject: [FFmpeg-user] timecode_frame_start option has no effect
> > I'm trying to cut a video starting from an exact frame position, using the
> > "timecode_frame_start" option.
> > For example, I'll use this video:
> > http://www.seaotter.com/marine/movies/hermit-long-01.mpg
> >
> > It seems the option has no effect at all, regardless of where I put it. 
> > The
> > resulting video always starts at the same frame position.
> Werner,
> This is not what the command does, it is intended to set the start TC value.
> (but that probably does not even work on Mp4 output, it does on QT (and 
> perhaps other formats).)

Yes this (deprecated) function is just to mark the mpeg stream, this is
not what you are looking for.

> Use -ss instead (be warned it might not be frame accurate)

It won't.

OTOH, you may use -vf select for accurate frame selection (something like
-vf 'select=gte(n\,100)' to skip the 100 first frames); I'm not sure how
well this will work with audio sync though.

The frame accurate seek is a wanted feature, but I don't know if an issue
is already opened for this. You might want to dig on the trac¹ and
eventually open a new ticket.


[1]: https://ffmpeg.org/trac/ffmpeg/report

Clément B.
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