[mythtv-users] Confused 5.1 Sound Mapping?

[Tim Draper]

---- On Tue, 04 Aug 2015 02:31:32 +0100 Jim  wrote ---- 
>
> 
>On 08/03/2015 11:28 AM, Jim wrote: 
>> 
>> 
>> 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? 
>> 
>> 
>I may have found a solution to the wrongly mapped 5.1 surround sound 
>problem. There is a module, called module-remap-sink, available in the 
>pulse audio module suite that supports remapping of all the speakers. 
>I've not tested with all possible configurations but at least one 
>configuration is working properly and now the sound is coming from the 
>correct speakers. There may be more to address, but at least the wife is 
>happy for now! 
> 
> 
Thats good to know of that tool. Maybe one to try in the future when i next encounter an issue. Reinstalled an FE isnt much of an issue for me; i have it on USB stick, so that plus a 20minute dist-upgrade is quicker than spending hours finding a solution.