This app fixes video sound trouble like "No Sound", "Cant change Audio Track".(mp4, mov, m4v)
1.First, copy videos(mp4, mov, m4v) to this app by using iTunes, or Other apps OpenIn.
2.Select video file from the list, then select action.
"REPACK TO MP4" : Create new mp4 file.
"REPACK TO MP4(160kbps)" : Create new mp4 file, and convert audio bitrate 160kbps(if over 160kbps), convert audio format to aac(if other format).
3.If success, app makes new mp4 file in Documents/OUTPUT. Try to play it.