<br><br><div><span class="gmail_quote">2008/2/25, Yeechang Lee <<a href="mailto:ylee@pobox.com">ylee@pobox.com</a>>:</span><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
For those experiencing problems with audio while running SVN (such as<br> Curtis Stanford, at<br> <URL:<a href="http://www.gossamer-threads.com/lists/mythtv/users/318588#318588">http://www.gossamer-threads.com/lists/mythtv/users/318588#318588</a>>),<br>
the cause may be the new audio upmix feature (ticket #1104) recently<br> merged into trunk.<br> <br> My frontend is connected via S/PDIF to a 5.1 receiver, with AC3 and<br> DTS passthrough enabled. Here's my experience with various recordings'<br>
audio sources with #1104 and the Active Simple or Active Linear<br> upmix settings:<br> <br> * MPEG-2, AC3 audio: No issues[1].<br> * MPEG-2, non-AC3 audio: No issues.<br> * MPEG-4, non-AC3 audio (generated via mythtranscode from MPEG-2 and,<br>
usually, AC3): Very soft music. Voices are almost inaudible even at<br> very high volume.<br> <br> Shifting to Passive seems to fix the issue with the MPEG-4<br> files. #1104 (the only place I can find any relevant documentation at<br>
all on the topic) states that the Active Simple and Active Linear<br> settings require more CPU. My frontend is a Pentium 3.0GHz; who'd have<br> figured that audio decoding (as opposed to video) would be so<br> CPU-intensive? In any case, I've uploaded a patch (#4775) that may<br>
help in avoiding some future confusion.<br> <br> [1] As far as I can tell; I'm no audiophile and perhaps I'm missing<br> some nuance those with keener ears would pick up instantly.<br> <br><br> --<br> Yeechang Lee <<a href="mailto:ylee@pobox.com">ylee@pobox.com</a>> | San Francisco CA US<br>
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