same exact issue i converted VOB video files from dvd to mp4 in a avi container and mp3 audio, using a program called handbrake. The videos playback perfectly fine on Win7 pc with mpeg4 codecs installed. There is absolutely no good reason for any troubles at all, and yet my lg piece of **** g3 complains cannot play this type with the stock video player. the sony xperia z3 has no trouble with a wide range of video types, is it really so hard for lg build better codec support into the stock player? should be no need for VLC, which in my honest opinion also sucks and is nothing like its pc counterpart which actually is worth its weight at least in a windows enviornment, on android it is a whole other story.