<br><br><div class="gmail_quote">On Fri, Apr 10, 2009 at 9:09 AM, Glenn Sommer <span dir="ltr"><<a href="mailto:glemsom@gmail.com">glemsom@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
Hey<br>
<br>
I'm trying to get AC3 / DTS passthrough to work in MythTV 0.21-fixes.<br>
<br>
This is what I've done sofar.<br>
<br>
1. Tested the SPDIF output works using mplayer (mplayer -ac<br>
hwa3c,hwdts -ao alsa:device=hw=0.1)<br>
<br>
2. Configured MythtTV:<br>
Audio output device = ALSA:default<br>
Passthrough output device = ALSA:iec958( AES0 0x02 )<br>
Max Audio Channels = Stereo<br>
Upmix = Passive<br>
Enable AC3 to SPDIF passthrough = checked box<br>
Enable DTS to SPDIF passthrough = Checked box<br>
Aggressive Sound Card = Not checked box<br>
Use internal volume control = Not checked box<br>
<br>
(All other channels NOT using AC3 or DTS are working fine over spdif)<br>
<br>
aplay -L says:<br>
mythtv@mediecenter ~ $ aplay -L<br>
default:CARD=Intel<br>
HDA Intel, ALC888 Analog<br>
Default Audio Device<br>
front:CARD=Intel,DEV=0<br>
HDA Intel, ALC888 Analog<br>
Front speakers<br>
surround40:CARD=Intel,DEV=0<br>
HDA Intel, ALC888 Analog<br>
4.0 Surround output to Front and Rear speakers<br>
surround41:CARD=Intel,DEV=0<br>
HDA Intel, ALC888 Analog<br>
4.1 Surround output to Front, Rear and Subwoofer speakers<br>
surround50:CARD=Intel,DEV=0<br>
HDA Intel, ALC888 Analog<br>
5.0 Surround output to Front, Center and Rear speakers<br>
surround51:CARD=Intel,DEV=0<br>
HDA Intel, ALC888 Analog<br>
5.1 Surround output to Front, Center, Rear and Subwoofer speakers<br>
surround71:CARD=Intel,DEV=0<br>
HDA Intel, ALC888 Analog<br>
7.1 Surround output to Front, Center, Side, Rear and Woofer speakers<br>
null<br>
Discard all samples (playback) or generate zero samples (capture)<br>
<br>
aplay -l says:<br>
mythtv@mediecenter ~ $ aplay -l<br>
**** List of PLAYBACK Hardware Devices ****<br>
card 0: Intel [HDA Intel], device 0: ALC888 Analog [ALC888 Analog]<br>
Subdevices: 1/1<br>
Subdevice #0: subdevice #0<br>
card 0: Intel [HDA Intel], device 1: ALC888 Digital [ALC888 Digital]<br>
Subdevices: 1/1<br>
Subdevice #0: subdevice #0<br>
<br>
3. I've ensured no /etc/asound.conf or ~/.asound.conf files exist!<br>
<br>
When trying to watch something containing AC3, I shortly see my<br>
receiver says Dolby Digital... By looking at my receiver - it seems<br>
that it knows an AC3 stream is there, but it contains 0 channels (my<br>
receiver shows the channels in use, and all channels are off when<br>
using MythTV).<br>
<br>
When using mplayer everything works as expected.<br>
<br>
Clearly I must have missed something obivios here - I just cannot<br>
figure out what?<br>
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</blockquote></div><br><div><br></div><div>Why on earth would you want to resample. The goal should bit true digital output. Pass the bits to the receiver and let it do a DAC. For best quality, don't decode, encode, decode just decode.</div>
<div><br></div><div>Allen</div><div><br></div>