[FFmpeg-user] -Bitsream Copy and Seeking

Lars Kiesow lkiesow at uos.de
Thu Aug 28 13:27:01 CEST 2014

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

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?


[1] http://trac.ffmpeg.org/wiki/Seeking%20with%20FFmpeg
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