mplayer can do it. You can simply watch the video without sound by doing:
Code:
mplayer -nosound YourFile.wmv
If you want to strip out the sound and save a new video without it, things get a little trickier; depending on the video codec used, it may or may not be easy. One way I know of:
Code:
mencoder -ovc copy -nosound YourFile.wmv -o VideoOnly.wmv
