[mythtv-users] MythTV 0.24 HDMI audio problem

Steven Adeff adeffs.mythtv at gmail.com
Thu Nov 18 19:07:48 UTC 2010


On Wed, Nov 17, 2010 at 6:11 PM, Jean-Yves Avenard <jyavenard at gmail.com> wrote:
> On 18 November 2010 06:28, Mr. Duncan McDonald
> <duncan.john.mcdonald at gmail.com> wrote:
>> Hi folks,
>>
>> Upgraded to 0.24 from 0.23 and it was nearly seamless! :-)
>>
>> I'm using Mythbuntu 10.4 with Alsa 1.0.23 (not Pulse Audio because for some reason I could never get this to work with 10.4) - the connection is over a Nvidia GT220 card using HDMI to a surround sound receiver.
>>
>> The problem is that when I first boot the machine I don't get audio out of MythTV until I run something like Mplayer (which does output audio straight away) - once I've run a video using Mplayer and  go back into MythTV audio works within it again! My audio device in MythTV has correctly been discovered as 'ALSA:hdmi:CARD=NVidia' and outputs Dolby Digital no problem.
>>
>> Has anyone come across this before or have any suggestions for how to fix this? (audio worked perfectly using this setup in 0.23 but I realise there's been a lot of great audio changes from 0.23 to 0.24). I'm using revision 27251. I understand getting PulseAudio to work is the correct solution but unfortunately I've had no luck with 10.4 (especially since I have a slightly different setup and am using Alsa 1.0.23) - maybe upgrading to 10.10 would help?
>
> The ALSA drivers for the newer hdmi nvidia card is far from perfect yet.
> It detects several hdmi audio device, and only one works.
> It's a bit of a try&test to find out which one work.
>
> XBMC has a good wiki on the matter:
> http://wiki.xbmc.org/?title=HOW-TO_set_up_HDMI_audio_on_nVidia_GeForce_G210%2C_GT220%2C_or_GT240
>
> It has a list of cards, what is known to work for both which device to
> use and the speaker configuration.
>
> Myth relies on ALSA to provide the correct information to test devices
> capabilities ; so until the values returned by alsa are correct, you
> will have to manually set it.

JYA, the issue I have with manually setting it is that the features
like AC3/DTS passthrough, and multichannel LPCM don't appear. I think
this may be why when I try and play 24bit/96KHz FLAC files from
HDTracks that all I hear is static. Last night I figured I'd try and
play the same through my bedroom system which doesn't have HDMI, only
S/PDIF and it played fine.

-- 
Steve
http://www.mythtv.org/wiki/User:Steveadeff
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