Hey guys, I used this process I outlined in a previous thread to convert my .mkv encodes to .m4v so I can bring them into iTunes and play them over my TV3 (You can skip down to the end if you don't want to read through the process). "Download Remux from here :http://www.macupdate.com/app/mac/35968/remux/ Then, drag and drop the original mkv into the program. Under the "Reencode" column in the same row as the audio, it should default to "no". Click the scroll down menu and change to AC3 448k. Set an alternate save location (or rename the file) or else your original file will be overwritten and the conversion will fail. After Remux does its thing, you will now have an mkv with a AC3 audio track rather than DTS. Now, drag and drop this new file into Subler. Passthru both the audio and video track. Rename this audio track "Surround Sound" or something like that. Then, drag and drop the same file into Subler again, this time only keep the audio track checked and use the drop down menu to select "AAC - Stereo". This will convert the AC3 track to Stereo audio for playability on an iPhone/iPad. Rename this track "Stereo" or something similar. If you want to save the original DTS track as well, just repeat the step above using the original, unconverted mkv, only check audio, passthru, and rename to "DTS" or something similar. You should now have a video track and a couple of audio tracks in the Subler window. You must order them as follows: Video Track Stereo Surround (DTS) Or else the resulting mp4 will not play audio in iTunes. Now use the magnifying glass in the top right corner of Subler to add metadata, etc. Then, click the video track and a few options should become available to you. Make sure the video profile is set to firstname.lastname@example.org (I've heard the aTV can support other versions, but its not officially listed on the Apple site, so email@example.com is what I use). Then, when none of the tracks (video, audio, etc) are highlighted, an "Other Settings" menu becomes available. Use this to set the file as 720p, 1080p, etc. Finally, when you are ready to go and start the process, if your file will be >4GB, you must check the "64 bits chunk offset" option in the "Save As" menu." My issue is, for the first time ever, Remux won't accept one of my .mkv encodes. I drag and drop the file into Remux and just nothing shows up. So I'm at a loss how to convert the DTS audio to AC3. Any thoughts? I'm going to give the new MP4Tools beta a shot, as well as Subler 0.17, but my previous experiences with these programs have produced .m4v files with audio sync issues.