Some of my HB'ed m4v's are crashing QuickTime X and 7 (VLC is fine), and some research turned up that it may be due to one or more audio tracks being tagged with improper language codes or more than one audio track referenced causing QT to crash. Comparing working and non-working m4v atoms, I found atoms for the working track were 0x15c7 versus 0x55c4 for the m4v's that crashed (code follows the ISO 639 language codes, splitting 16 bytes into three 5 bit blocks w/ each representing the letter of the country code, etc.). I need to mention that many of my m4v's have 2-3 audio tracks: 1 AC3 Passthu (or 6-channel discrete) 2 AC3 stereo 3 AC3 for directors commentary or such I've tried Subler to fix the issue, and noticed there are more audio tracks than I set in Handbrake. I attempted to fix it by checking the needed audio tracks (and noticed I can rename each layer) in Subler and yet they still crash. Now I'm getting CVDisplayLink crashing. How do I remux the m4v so that QT X and 7 default to the correct audio track when played? I know how to select "Language" in QT, but I cannot seem to check any of the tracks listed (and some only list 2 or so audio tracks). Thanks for any help!