[FFmpeg-user] Issues with sliced video

Reuben Martin reuben.m at gmail.com
Wed Jun 1 03:06:55 CEST 2016

On Tuesday, May 31, 2016 6:14:15 PM CDT Celso Junior wrote:
> Hello there
> Make sure to use -c:v copy -c:a copy to mantain video and audio quality in
> your output.

That will not work unless the start and stop points are on I-frames.

> 2016-05-31 11:14 GMT-03:00 Praveen kumar <praveenk at galaxykms.com>:
> > Hello,
> > 
> > We are using ffmpeg in one of our applications for slicing a video. The
> > slicing part is working fine but the data rate, video & audio bit rates
> > are
> > decreasing in the sliced output video. Following is the command we are
> > using for slicing:
> > 
> > ffmpeg.exe -i inputVideo.mp4 -ss StartTime -t StopTime -async 1 -strict
> > -2  -y OutputVideo.mp4

Bit rates don't mean much, especially in cases where the origional is encoded 
with a different encoder implementation. You should only worry about the 
bitrate in cases where a very strict constant bitrate is required. (which is 
almost never needed and is a big waste of bandwidth)

Instead, compare the quality of the output. If the quality is suffering there 
are options available to improve it.


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