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up vote 7 down vote favorite

If just need to crop Audio/Video from a longer track, what can I use? I tried OpenShot, but I find the export video slow, perhaps its compling all the "layers" into a new movie? Perhaps I just need a simple "crop" tool for audio/video will surfice?

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What sort of video formats are you dealing with? Are you looking for a GUI or a CLI solution? – fossfreedom♦ Aug 6 '11 at 11:21
Formats will be probably mp4, flv, mp3. GUI or CLI will be fine. – Jiew Meng Aug 6 '11 at 13:06

3 Answers

up vote 6 down vote accepted

Avidemux (From PPA) - http://avidemux.sourceforge.net/

OpenShot (From PPA) - https://launchpad.net/openshot/1.3/1.3.1 / http://www.openshot.org/ppa/

Pitivi (From PPA) - http://www.pitivi.org/?go=download

I was going to mention commands like ffmpeg or avconv (The new one) which can OBVIOUSLY split files into groups. For example:

FFMPEG (Deprecated in 12.04+)

ffmpeg -i input.avi -vcodec copy -acodec copy -ss 00:00:00 -t 00:30:00 output1.avi
ffmpeg -i input.avi -vcodec copy -acodec copy -ss 00:30:00 -t 00:30:00 output2.avi
ffmpeg -i input.avi -vcodec copy -acodec copy -ss 01:00:00 -t 00:30:00 output3.avi

Or

ffmpeg -ss 0 -t 100 -i source.m4v -vcodec copy -acodec copy part1.m4v
ffmpeg -ss 100 -t 100 -i source.m4v -vcodec copy -acodec copy part2.m4v
ffmpeg -ss 200 -t 100 -i source.m4v -vcodec copy -acodec copy part3.m4v
ffmpeg -ss 300 -t 100 -i source.m4v -vcodec copy -acodec copy part4.m4v

avconv -i input.avi -vcodec copy -acodec copy -ss 00:00:00 -t 00:30:00 output1.avi
avconv -i input.avi -vcodec copy -acodec copy -ss 00:30:00 -t 00:30:00 output2.avi
avconv -i input.avi -vcodec copy -acodec copy -ss 01:00:00 -t 00:30:00 output3.avi

Or

AVCONV

avconv -ss 0 -t 100 -i source.m4v -vcodec copy -acodec copy part1.m4v
avconv -ss 100 -t 100 -i source.m4v -vcodec copy -acodec copy part2.m4v
avconv -ss 200 -t 100 -i source.m4v -vcodec copy -acodec copy part3.m4v
avconv -ss 300 -t 100 -i source.m4v -vcodec copy -acodec copy part4.m4v

Or do some script like here: http://icephoenix.us/notes-for-myself/auto-splitting-video-file-in-equal-chunks-with-ffmpeg-and-python/

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1  
Beware: According to the man page [ linux.die.net/man/1/ffmpeg ] this results in unnatural, overlapping cuts. For instance, the second command starts at 00:30:00 but goes on for an hour; i.e., up to 01:30:00, so the third command, which starts at 01:00:00, will yield an overlapping cut. It may be the goal, but it wouldn't be very natural. – eze Sep 24 '12 at 22:12
I can vouch for what ezequiel mentions. When doing the tests with ffmpeg or avconv the overlapping effect appears if using the times as mentioned above. I will update to a more accurate effect although I should mention that the first second will also overlap. I will fix both and add avconv to the group. Thanks ezequiel. – Luis Alvarado♦ Sep 25 '12 at 3:00
up vote 1 down vote

I'm using ffmpeg CLI interface for that. It's very easy and fast:

  • to cut video:

    ffmpeg -i InputFile -vcodec copy -acodec copy -ss 00:00:00 -t 00:01:32 OutPutFile

  • to cut audio:

    ffmpeg -i InputFile -vn -acodec copy -ss 00:00:00 -t 00:01:32 OutPutFile

In both of these -ss is a start point, while -t - is a duration of the piece.

You can calculate duration e.g. using LibreOffice Calc or python's dateutil package.

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up vote 0 down vote

you can use winff (GUI for ffmpeg) also

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Can you provide more information about how to obtain and use winff? – Eliah Kagan Sep 8 '12 at 1:43
sudo apt-get install winff – vellvisher Mar 4 at 14:53

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