In an earlier post I talked about settings for ffmpeg for flash video, and today I came across another helpful setting for ffmpeg.

Sometimes your video will run for 30 minutes, however you only want to upload it in 10 minute segments.

The following command will split a movie file

ffmpeg -i myfiletosplit.flv -ss 00:00:00 -t 00:10:00 mydestinationsplit_1.flv 

-i defines the input, it would usually look like -i location/of/my/movietosplit.flv

-ss is the beginning of the file in hh:mm:ss from the beginning of the video file

-t is the length of time you want to capture the clip in hh:mm:ss.  The first time I used this I made the mistake of thinking this was the time I wanted to record until, remember it is the duration of the clip you want to capture.

So if you had a 24 minute clip and wanted to capture it in 3 x 8 minute clips you would use the following

ffmpeg -i myfiletosplit.flv -ss 00:00:00 -t 00:08:00 mydestinationsplit_1_3.flv -ss 00:08:00 -t 00:08:00 mydestinationsplit_2_3.flv -ss 00:16:00 -t 00:08:00 mydestinationsplit__3_3.flv