[mythtv] [mythtv-commits] Ticket #1856: Audio with only one channel should be output in mono to both left and right

Ed W lists at wildgooses.com
Tue Jul 4 07:01:16 UTC 2006

Michael T. Dean wrote:
> On 07/03/2006 01:39 PM, Steven Adeff wrote:
>> On 6/29/06, MythTV <mythtv at cvs.mythtv.org> wrote:
>>> #1856: Audio with only one channel should be output in mono to both left and right
>>> -------------------------------+--------------------------------------------
>>>  Reporter:  huffman at graze.net  |        Owner:  skamithi
>>>      Type:  enhancement        |       Status:  closed
>>>  Priority:  minor              |    Milestone:
>>> Component:  mythtv             |      Version:
>>>  Severity:  medium             |   Resolution:  invalid
>>> -------------------------------+--------------------------------------------
>>> Changes (by skamithi):
>>>   * resolution:  => invalid
>>>   * status:  reopened => closed
>>> Comment:
>>>  i believe you should resolve such issues using alsa.
>> I think this is the wrong way of going about this issue, it should
>> really be something handled within MythTV.
> I like Stanley's approach.  Otherwise, Justin will have to figure out 
> where to put all the new settings:
> Output 1-channel audio to:
>     2 channels (stereo L+R)
>     4 channels (Ctr-FR-FL-Rear)
>     5 channels (Ctr-FR-FL-RearR-RearL)
>     ...
> Output 2-channel audio to:
>     2 channels
>     4 channels
>     5 channels
>     ...
> And, we still have to factor in the existing "Independent Muting of Left 
> and Right Audio Channels" (for those with dual-language broadcasts).
> All this can be done in ALSA's configuration with translation tables...  

How do I configure my Jack devices to make mono output appear as 
stereo?  This is something which is slightly irritating at present and I 
was just working up to coding around - it's therefore distressing to see 
hot headed opinions that the whole world is a configuration problem 
waiting to be solved

Unless someone can give a better example I disagree that your mappings 
above are useful.  Mono is a special case in my opinion and it should 
usually be upgraded to stereo (and only to stereo).  I am not saying 
this is a definitive because I don't know all other needs, but none 
immediately jump to mind...

There is already some partial code to do this for the TV I believe?   
Someone added some code for the situation that you had mandarin in one 
channel and something else in the other channel and you could mute one 
but upgrade the result to stereo again.

Ed W

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