[FFmpeg-devel] [PATCH] doc: extend -ss documentation.

Clément Bœsch ubitux at gmail.com
Fri Nov 16 13:41:24 CET 2012

On Thu, Nov 15, 2012 at 11:11:15PM +0100, Nicolas George wrote:
> Le quintidi 25 brumaire, an CCXXI, Michael Niedermayer a écrit :
> > i tried with a random file, i see no difference between this and
> > ommiting the second -ss 0
> It looks like the behaviour has changed at some point. Now, the frames with
> negative timestamps are dropped by the vsync method, if it is not set to 0.
> That is interesting. Patch temporarily withdrawn, I will look into it
> closer. Thanks.

Michael fixed -ss and codec copy recently (a/v desync). -ss + codec copy
won't be accurate (cut at key frames) but very fast, -ss + transcode will
be accurate because it can cut at any frame. You might want to mention
this in the next patch. Note that I don't know how different it performs
with -ss as input and output in these cases.

Clément B.
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