after several recent updates to my Linux Mint DE system, videos weren't playing… even in swiss-army-knife-player VLC…"No suitable decoder module:
VLC does not support the audio or video format "mp4v". Unfortunately there is no way for you to fix this." after googling it, I found this Ubuntu Forums thread pointing towards a "libavcodec52" file which may need to be installed. http://ubuntuforums.org/showthread.php?s=c24cadc3d9800ddde2dcea47a3520e6c&t=1306803&page=2 Although it was an old forum post, I checked in Synaptic, & it did indeed have an upgrade available for that file – done & done… problem solved.