[mythtv-users] how to tell if 5.1 audio channels mapped correctly?
jan at horde.org
Sun Nov 7 17:37:24 UTC 2010
Zitat von Jean-Yves Avenard <jyavenard at gmail.com>:
> On 6 November 2010 05:57, Dan Christensen <jdc at uwo.ca> wrote:
>> Well, there's good news and bad news. The good news is that I now see
>> the pattern. Whenever I get digital passthrough to work with a piece
>> of software (myth AC3/DTS, mplayer DTS and xine DTS), the playback is
>> correct. But whenever I don't use digital passthrough, the playback
>> is wrong, including with mythtv! For example, with
>> played back in myth without digital passthrough, the center and left
>> surround channels are swapped, and it sounds like the LFE and right
>> surround channels are swapped too (but I don't have a subwoofer, so
>> it's harder to tell).
>> So now it looks like I have a systematic problem with channel mappings.
>> Could it be because the version of alsa I'm running is older than yours?
>> I'm running Debian lenny with these alsa versions
> If the channel order is consistent when using LPCM ; it could very
> well be your amplifier ... Otherwise you can remap it easily with an
> alsa configuration.
> The way I test LPCM on my box is through the analog output ; and I can
> tell you it's correct.
> This PC is still running Ubuntu 9.10. Will probably upgrade to 10.04
> LTS at some stage : but as they say ; if it ain't broken.. And this is
> my main frontend.
This thread got me curious, so I've run your test videos on my FE. The
MB is connected to the amplifier through S/PDIF, and the amp's
internal speaker test assures that all speakers are working and
If I run the 5.1 test videos though, I don't get any sound from the
surround (rear) speakers. MythTV is configured to use the digital alsa
port, DD and DTS passthrough, upsampling of stereo.
I don't have a /etc/asound.conf file.
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