[FFmpeg-user] Understanding the behavior of "-ss/-t" option

[Gyan]

On Fri, Sep 8, 2017 at 2:53 PM, Nicolas George <george at nsup.org> wrote:


> After further testing, it seems the -ss option is itself relative to the
> file's start time: by setting -ss 60 with a file that starts at 60, you
> are asking to seek to timestamp 120. And with -copyts, you get that
> timestamp.
>

Except with seek_timestamp set to 1, the first packet you 'expect' to get
is pts_time 60. And it does work that way if copyts is *absent*.