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[Jayaeu]

2008/2/25, Yeechang Lee <ylee at pobox.com>:
>
> For those experiencing problems with audio while running SVN (such as
> Curtis Stanford, at
> <URL:http://www.gossamer-threads.com/lists/mythtv/users/318588#318588>),
> the cause may be the new audio upmix feature (ticket #1104) recently
> merged into trunk.
>
> My frontend is connected via S/PDIF to a 5.1 receiver, with AC3 and
> DTS passthrough enabled. Here's my experience with various recordings'
> audio sources with #1104 and the Active Simple or Active Linear
> upmix settings:
>
> * MPEG-2, AC3 audio: No issues[1].
> * MPEG-2, non-AC3 audio: No issues.
> * MPEG-4, non-AC3 audio (generated via mythtranscode from MPEG-2 and,
>   usually, AC3): Very soft music. Voices are almost inaudible even at
>   very high volume.
>
> Shifting to Passive seems to fix the issue with the MPEG-4
> files. #1104 (the only place I can find any relevant documentation at
> all on the topic) states that the Active Simple and Active Linear
> settings require more CPU. My frontend is a Pentium 3.0GHz; who'd have
> figured that audio decoding (as opposed to video) would be so
> CPU-intensive? In any case, I've uploaded a patch (#4775) that may
> help in avoiding some future confusion.
>
> [1] As far as I can tell; I'm no audiophile and perhaps I'm missing
> some nuance those with keener ears would pick up instantly.
>
>
> --
> Yeechang Lee <ylee at pobox.com> | San Francisco CA US
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