[FFmpeg-user] -Bitsream Copy and Seeking

Qianliang Zhang zhangqianliang at gmail.com
Mon Sep 1 03:35:53 CEST 2014

It says 'might', I used -ss with -c:v copy, and I got no problem too.

On Thu, Aug 28, 2014 at 7:27 PM, Lars Kiesow <lkiesow at uos.de> wrote:

> Hi everyone,
> yesterday a college of mine brought to my attention the following
> sentence from the FFmpeg wiki:
>   “If you use -ss with -c:v copy, the resulting bitstream might end up
>   being choppy, not playable, or out of sync with the audio stream,
>   since ffmpeg is forced to only use/split on i-frames.” [1]
> I'm regularly using bitstream copy together with seeking (-ss as input
> option) and can't remember having any problems. Is this statement still
> true?
> I could understand that when -ss is used as output parameter it might
> cause problems as ffmpeg will then decode the input stream but still
> tries to use bitstream copy. Two things which kind of clash. But when
> -ss is used as input option?
> Regards,
> Lars
> [1] http://trac.ffmpeg.org/wiki/Seeking%20with%20FFmpeg
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