[mythtv-users] 7.1 channel audio
Al McIntosh
junkmail at allanmcintosh.com
Sun Mar 11 00:11:26 UTC 2007
Michael T. Dean wrote:
> On 03/10/2007 11:42 AM, Al McIntosh wrote:
>
>> Michael T. Dean wrote:
>>
>>
>>> On 03/10/2007 10:58 AM, Al McIntosh wrote:
>>>
>>>
>>>
>>>> Michael T. Dean wrote:
>>>>
>>>>> On 03/09/2007 11:13 PM, Al McIntosh wrote:
>>>>>
>>>>>> I have a Sound Blaster Live! card connected to 7.1 amp via optical
>>>>>> coax cable. When I watch DVDs or anything with xine I get nice, rich
>>>>>> full surround sound. However, when I watch recorded shows within mythtv
>>>>>> there is no output from LS or RS. The front , center and rear channels
>>>>>> all output. Is this a shortcoming of my current version
>>>>>> *mythtv-0.20-153.fc6.at*? With the below .asoundrc I set playback to
>>>>>> ALSA:default. Any ideas?
>>>>>>
>>>>> See the thread:
>>>>> http://www.gossamer-threads.com/lists/mythtv/users/134449#134449
>>>>>
>>>>> and especially:
>>>>> http://www.gossamer-threads.com/lists/mythtv/users/134552#134552
>>>>>
>>>> From what I understand, these threads all suggest configuring ALSA to
>>>> duplicate front channel sounds for output to the unused channels. IE: my
>>>> LS and RS channels.
>>>>
>>>> I will still be missing the actual sounds that are intended for LS and
>>>> RS channels.
>>>>
>>> Show me a source you're getting with 7.1 channels (other than
>>> DVD's--which you've said you have working), and I'll mention the other
>>> possible approach (#1104).
>>>
>> Okay, my AMP can up convert a 5.1 to 7.1, which typically works.
>>
>
> And if you read the (entire) thread I referenced, you'll see that it
> does so using very similar algorithms (although--at least according to
> Franco--doing it yourself with ALSA provides much higher quality audio
> than using the amp's internal "upconvert, and I'm guessing you have the
> same amp he does).
>
>
>> IE:
>> when I watch a TV show on TV with my Satalite receiver connected to my
>> AMP via RCA cables, I receive 7.1 channels of audio. If I playback the
>> same show recorded in myth, my LS and RS are as I have mentioned unused.
>> So you're saying I have 2 choices, use ALSA to duplicate channels for
>> playback or compile an #1104 patched version of Myth? So the 1104 does
>> that also duplicate channels?
>>
>
> Actually, I haven't explained about #1104. You'd have to write the 7.1
> channel support for it, because it doesn't yet have it--therefore, you
> could decide how to invent the non-existant information (if you have
> some approach that's better than just duplicating channels).
>
>
Right, I see what you're saying. I'll tinker with this and get back. I
guess it probably makes more sense to duplicate the rear channels in the
side as they're supposed to be background and subtle. I guess I can
play and see what sounds better.
Al
More information about the mythtv-users
mailing list