how to compressed video file,it's very easy in virtual dub software.you can easily compressed your video without loosing video quality. simple steps and you can done easily. br br first you download virtual dub software. br br br Then Download xvid software on your PC. here is link to download Xvid software. br br br br then you open the software virtual dub and go to file and select your video on your PC. then go to Audio and click full processing mode,then go again Audio and select Audio Compression and then go video option and select Video Compression then select Xvid mpeg format.