Track 2: Original DTS 768kbit/s 6 channel audio (or AC3 384kbit/s where quality not important) Track 1: AAC 128kbps (or better downmixed from DTS 6 channel) Stereo An avi dual audio file is no good for use with iTunes or Apple TV. I have discovered that (as is recorded elsewhere on this forum) Avidemux cannot yet create an mp4 file with two audio tracks in it. I wanted though to keep the 5.1 information so that when in future I buy a surround sound receiver, I can select the surround track in iTunes and use the HDMI output from the Apple TV as an input to the receiver. I have therefore used Avidemux to convert to H.264 and downmix an AAC stereo track from one of the AC3 6 channel audio tracks in the VOBs. I have discovered that iTunes and Apple TV require a stereo audio track otherwise they both choke on the file. I have been running experiments to see if I can create good mp4 files of movies I already have on DVD so that they can be kept in iTunes and be accessible to (or streamed to) my Apple TV.
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