This link has been bookmarked by 1 people . It was first bookmarked on 17 Feb 2008, by Werner E. L..
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17 Feb 08
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we still don't know if "Dolby 5.1" means "Dolby Digital 5.1" (AC3, like on a DVD) or "Dolby's AAC with 5.1 channels, converted to AC3 and send over the optical out in real time"....
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The latter would be better for HB, as it already does AAC 5.1 and it's standards-compliant. While AC3 would mean they're moving back to .mov, as .mp4 doesn't really support AC3.
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AC3 is not part of the MP4 standard, which is a matter of ISO politics more than technicalities -- .mov, of which .mp4 is a subset, supports AC3 fine.
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If HandBrake has to break the mp4 standard to have AC3 in it, that means those files probably won't be playable on other devices.
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Apple TV content provided through the iTunes Store from day one has been in a MOV container rather than MP4...so why is anyone confused about how Apple "might handle this"? It will be AC3 in a MOV.
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The question, if there is one, for the HandBrake team is to decide whether they would rather "bastardize" MP4 to support AC3 or whether they'd rather support output in a MOV container.
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I'm putting money on the AppleTV using AAC with 5 channels in the .m4v file... same as the movie trailers from apple.com/movies
AAC -> AC3 on the fly over toslink + HDMI
Why do I think this?
AC3 stream is too large to to transfer over interweb -
Handbrake 0.9.1 can already output the following - AVC/H.264 Video/ AC-3 Audio. But it can only do this as a .mkv or .avi file. Why would it be so hard to do it as a .mov file?
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My guess would be that Apple is just encoding the video as H.264 and "copying/attaching" the AC-3 audio to the resulting file.
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