I have couple of movies converted to M4V with different kind of quality and bit-rate. I was surprised to notice that some videos stutter (stop every 2-3 seconds) while being streamed to iPad 4th through Home Sharing feature. Today by coincidence I made two M4V videos of the same video, both converted by iVI (same video bitrate, audio etc). They are exactly the same except that one has a AAC track in first order while AC3 in 2nd, while the other AC3 first. The one that has AAC track first plays excellent, while the other stutter. I was able to confirm the above observation with other movies and even the ones converted by Handbrake are stuttering (having AC3 track set as first). All movies play fine in iTunes / VLC / Mplayerx. Now is it really possible that audio order could be a reason for this kind of behaviour? Has anyone experienced something similar? Is there any way to quickly change the audio track order in M4V files?