Video Editing: Difference between revisions

You can extract the part you want with mplayer like this:

$ mencoder -ovc copy -oac copy infile -ss 00:10:09.5 -endpos 00:05:00 -o outfile

"-ovc" means "output video codec", "-oac" means "output audio codec",

the "-ss" argument skips ahead to 10 minutes 9.5 seconds into the

This can also be done with ffmpeg:

$ ffmpeg -acodec copy -vcodec copy -itsoffset -00:10:09.5 -i infile -ss 00:10:09.5 -t 00:05:00 outfile

Note that the "-itsoffset" option must be specified to make sure that

A/V timestamps synchronize, and that its value must be the negative of

To transcode the video, specify the output codecs as the "vcodec" and

"acodec" sub-options to the libavcodec option (-lavcopts):

$ mencoder -ovc lavc -oac lavc -lavcopts vcodec=mpeg4:acodec=ac3 infile -o outfile

Here, "lavc" means to use one of the libavcodec codecs, specified by

the "vcodec" and "acodec" suboptions to the "-lavcopts" option (which

If you want to change the framerate of the video, you can use

something like this:

$ mencoder -ofps 25 -oac copy -ovc copy -o outfile infile

Note that, whenever you use "copy" as the codec, mplayer will copy the

corresponding stream to the output unmodified.  That means it will ignore

For example:

$ mencoder -oac copy -ovc copy -af volume=10 -o outfile infile

WILL NOT DO what you probably want, because with "-oac copy" the

"volume" audio filters (specified with "-af") will be ignored, and the