[mythtv-users] MythTV + AC3 question
William Munson
wmunson at rochester.rr.com
Fri Aug 25 17:18:40 UTC 2006
Drew Bernat wrote:
> With everything set up and (mostly) working, I've turned to getting my
> HDTV-recorded programs (via a PCHDTV-5500) to output using AC3. I
> looked through the archives and found a thread with similar symptoms
> to mine, but no resolution.
>
> The setup:
>
> PCHDTV-5500 recorded programs
> NForce 4 sound, ALSA, snd_intel_hda module (the MSI 6150 motherboard)
> MythTV internal player (mplayer et. al. work at this point).
> MythTV WIKI asoundrc file (in /etc/asound.conf)
>
> I've tried the following configurations with the included results. I'm
> wondering if this seems familiar to anyone:
>
> Sound output = ALSA:spdif or ALSA:iec958
> - ALSA complains about a nonexistent device (?)
>
> ALSA:hw:0.2 (the IEC958 output) or plughw:0.2
> - "AC3 passthrough" checked: static on all speakers
> - "AC3 passthrough" unchecked: overdriven audio out of right front
> channel only; I can hear the program, but it sounds like a blown speaker.
>
> ALSA:hw:0 or plughw:0
> - "AC3 passthrough" checked: no sound
> - "AC3 passthrough" unchecked: sound, but it's being decoded by Myth
> and coming out on analog + digital
>
>
> When I was using hw:0.2 and "AC3 passthrough" checked it appeared as
> though Myth was still using an internal decoder:
>
> 2006-08-24 05:22:52.810 AFD: Looking for decoder for MPEG2VIDEO
> 2006-08-24 05:22:52.834 AFD: Opened codec 0x7d5e50, id(MPEG2VIDEO)
> type(Video)
> 2006-08-24 05:22:52.874 AFD: Stream #1, has id 0x84 codec id AC3, type
> Audio at
> 0x0x79b390
> 2006-08-24 05:22:52.909 AFD: Looking for decoder for AC3
> 2006-08-24 05:22:52.927 AFD: Opened codec 0x7c8e70, id(AC3) type(Audio)
>
>
> Has anyone had a similar problem and managed to get it worked out? The
> oddest thing to me is the overdriven output on the right front channel
> - I'm not familiar with anything that would cause such symptoms.
>
The lack of sound devices is most likely your problem. Depending on how
you update your system you might want to install the alsa-devices package.
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