Nothing is infallable. That makes it normal that sometimes, whatever the reason, your video files break and stop working. This is due to them getting damaged or corrupted. For these cases you need a photo like All Video Fixer.
This utility lets you repair and restore videos that don`t play correctly. All Video Fixer looks for possible errors and anomolies, repairing everything that doesn`t work.
All Video Fixer works with the following formats: AVI, DIVX, XVID, MP4, ASF, 3GP, Flash, FLV, MPEG, RM, RMVB, WMV, VOB, MOV, etc. It even lets you restore damaged videos from portable devices like iPod, iPhone, Zune, PSP, etc.