dump a:
dvd
mplayer -dumpstream -dumpfile filename.dump dvd://1 (or 2, or3, or...)
only a chapter
mplayer -dumpstream -dumpfile chapter1.dump VTS_03_1.VOB
real stream
mplayer -dumpstream -dumpfile xxx.rm rtsp://where/the/stream/is
cat avi’s
cat 1.avi 2.avi | mencoder -noidx -ovc copy -oac copy -o output.avi -
wmv2avi (multible)
mencoder lola_* -oac pcm -ovc copy -cache 8192 -ofps 100.0 -o lola_final.avi
wma2wav
mplayer file.wma -ao pcm -aofile file.wav
export audio from a video
if you wan to export the audio stream from a video use:
mplayer -ao pcm:file=dump.wav -vo null video.video
this will give you a nice “wav” from the whole video without any picture.
-ao pcm:file=dump.wav : tells mplayer to use the standard pcm output and give him the name "dump.wav". -vo null  : tells mplayer to use no video output.
export single key frames from a video note: this will require a lot of disk space if you don’t use compression
mplayer -nosound -vo png video.video
-nosound : tells mplayer that only video will be used. -vo png  : tells mplayer to use the png image output format. z=<0-9>  : specifies the compression level. 0 is no compression, 9 is maximum
this are old ones. playing videos in a given geometry with stopping xscreensaver
mplayer -geometry -0:0 -screenh 480 -screenw 640 -fs -stop-xscreensaver
mplayer -geometry -0:0 -screenh 480 -screenw 640 -fs # for DPMS without screensaver