I spent 1-2 years learning everything I could in order to digitize all my DVD's. My goal was to obtain the best quality and ditch the discs. As I have a 12-Core mac pro with 32GB RAM, I tweaked handbrake with various rips until I had the perfect presets and let 'er rip. At the time, DTS sound, etc were only supported in MKV containers via Handbrake. Now, I need to remux those Blu-Ray encodes to M4V (shame I didn't wait for new Handbrake nightlies with DTS in m4v support, oh well). Since these are Blu-Ray encodes, I have multiple audio tracks (1 - Stereo 2 - DTS or AC3 - 3+ for directors commentary's/etc). As I understand, remuxing simply passing the data to a new container, ex mkv-m4v. I'm concerned as Subler does not appear to handle passthru for DTS or other high end encodes (could be wrong now), and the few times I tried Subler it couldn't handle multiple audio tracks. I only have a few to remux, if re-encoding is the only way to ensure everything is passed through, I'll do it, but I hate to re-encode when a remux passthru would make most sense. Aside from Subler, any other apps that may work? Thanks everyone! Greatly appreciate it. I'll check out the latest Subler beta in the meantime and read some more threads.