[Libav-user] Batch trimming commands

[Carl Eugen Hoyos]

Simon Daniels <simondaniels23 at ...> writes:

> On Fri, Jan 6, 2012 at 4:47 AM, Carl Eugen Hoyos <cehoyos at ...> wrote:
> > Simon Daniels <simondaniels23 at ...> writes:
> >
> >> Oftentimes I need to trim several clips out of the same video.
> >> Unfortunately this means ffmpeg.exe must scan over the same sections
> >> of video over and over again to get to the clip's starting point. A
> >> more efficient way to handle this would be to batch trimming commands.
> >> Maybe something like: ffmpeg -i "original.avi" -ss1 0:10:00 -t1 0:00:30
> > "output1.avi" -ss2 0:15:00 -t2 0:00:30 "output2.avi".
> >
> > Did you test your command line (without "1" and "2" except "output2.avi")?
> > It works fine here.

In case this was not clear, I meant:
ffmpeg -i "original.avi" -ss 0:10:00 -t 0:00:30
"output1.avi" -ss 0:15:00 -t 0:00:30 "output2.avi".

> I tried that and it creates output files with 0 bytes.
> 
> Here was my input:
> ./ffmpeg -i "/Users/user/Documents/original.MP4" -vcodec copy -acodec
> copy -ss 00:10:10 -t 00:00:30 -vcodec copy -acodec copy -ss 00:24:15
> -t 00:00:30 "/Users/user/Documents/output1.MP4"
> "/Users/user/Documents/output2.MP4"

That looks very different, and if you would not top-post (which is considered
rude here), you would have had a chance to see it yourself.

> Here was the output:
> ffmpeg version 0.8.git-08d2cee, Copyright (c) 2000-2011 the FFmpeg developers

This is old, please try current git head.

Carl Eugen