FFMPEG scripts
Make sure you always have the latest ffmpeg release.
mp3+jpg to flv
ffmpeg -loop_input -i picture.jpg -i audio.mp3 -shortest -acodec copy movie.flv
Split, but don't re-encode
ffmpeg -ss 0 -t 600 -i InputVideo.m4v -acodec copy -vcodec copy OutputVideo.m4v
This would create a video of the first 10 minutes of a video. From -ss 0 seconds to -t 600 seconds