[mythtv-users] Confused 5.1 Sound Mapping?

[Jim]

On 08/03/2015 10:35 AM, Tim Draper wrote:
>
> ---- On Mon, 03 Aug 2015 14:37:27 +0100 Jim  wrote ----
>> I am experiencing an odd mapping of the 5.1 sound channels. The
>> materials I've found on ALSA and Pulse have not led me to a remedy. I've
>> tested all available configuration options in the Audio Setup, all with
>> the same result.
>>
>> The sound is not simply a front-back misalignment. When performing the
>> 5.1 speaker test built into Mythtv, or using speaker-test I find the
>> following:
>>
>> front left out of front right
>> front right out of rear left
>> rear left out of rear right
>> rear right out of front center
>> front center out of LFE
>> LFE out of front left
>>
>> Has anyone else experienced this and have any idea of how to fix it?
>>
> i'm going to start with the basics:
> - how are to connecting the FE to your speakers; AVR, amp, or direct speakers?
> - does 5.1 work correctly when you use another device via same/different connections?
> - i use pulseaudio for my setup and do get channel mis-configuring on first install before i've configured it. Have you ran 'pavucontrol' on the desktop and configured your output type correctly. iirc it's on the last/2nd-to-last tab where you get various options like analogue stereo, digital stereo, digital surround, spdif etc as the output method.
>
>
> my last install refused to work correctly. a fresh install & configure pavucontrol fixed it.
>
The computer is connected via HDMI to a Yamaha RX-V575 AV Receiver. The 
receiver is directly driving all 5.1 speakers, and is connected via HDMI 
to the TV. The TV speakers are off.

A Blu-ray player is also connected via HDMI to the receiver. All 5.1 
sound is normal when playing DVDs and Blu-ray discs via this player.

I have run pavucontrol, selecting via the Configure tab the Digital 
Surround 5.1. (HDMI) Output.  The Output Devices tab shows the expected 
information.

I am glad to learn others have discovered and conquered this problem. I 
am sad to hear that it may take a new install. Is there no way to 
correct the mapping without a complete new install?