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Generate true 5.1 channel surround sound output
Authored by: edalzell on Feb 18, '09 08:48:42AM
Generate true 5.1 channel surround sound output
Authored by: dj_feare on Feb 18, '09 09:19:51AM

Modding the AC3 prefs file does work and it is certainly easier. My surround proc clearly denotes on the front panel display how many channels of audio it is receiving from the source *before *processing. With the AC3 prefs hack, I regularly see 5 discreet channels from HD QT trailers, mkv torrents, etc...

While I haven't tried the Jack method, it may offer some more flexibility and ease of changing settings.

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Generate true 5.1 channel surround sound output
Authored by: hazkid on Feb 18, '09 10:21:57AM

Actually, this hint does work, but ONLY if you have an AC3 soundtrack. The hint on this page explains how to get 5.1 if you do NOT have an AC3 soundtrack. Jack is a real time AAC->AC3 encoder. I happily use the Perian + AC3 Passthrough hack to enjoy 5.1 AC3 over optical from MKV and MPG/DVR-MS files.

Theoretically, 6Ch AAC passed over optical should be recognized if your receiver supports AAC - I've never heard of an American one that does this.

Finally, although I understand why (sort of) Apple uses AAC (AC3 is about 1.5x-2x the size of AAC) it boggles my mind when I try to think of why Apple uses AAC for movies bough on the AppleTV. The ATV has an optical output, is generally used with broadband connections, and would give users a much better experience if Apple simply used AC3 - which is universally supported in the US.

Naren Hazareesingh

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