[mythtv-users] Confused 5.1 Sound Mapping?

[Jim]

On 08/04/2015 07:00 AM, Tim Draper wrote:
>
> ---- 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.
>
>
>
I should have asked for clarification early regarding your mention of 
re-install. Glad to hear it is only the Mythtv FE and not the whole system!