[MPlayer-users] Mac OS X Audio 5.1 Channel Output Problems

[galenz at zinkconsulting.com]

Right, I see the mplayer downconverts to 2.0 audio by default. You  
have to manually specify 6 channel audio to have it not downconvert.

However, this is extremely un-Mac like and un-intuitive, given the  
available data. The Apple audio API automatically detects the number  
of channels physically available. The macosx audio out module should  
pass this value along to mplayer and set the number of channels  
accordingly.

This is what I mean about mplayer not detecting the multple channels.  
Various other applications - such as QuickTime Player and VLC - rely  
upon detecting available channels in this manner and make audio  
conversion/output settings accordingly.

-Galen

On Jan 16, 2008, at 2:25 PM, KURAAKU Deibiddo wrote:

> Galen,
>
> I could be wrong with this, but my understanding is that it's not a  
> matter
> of MPlayer not detecting it, it's a matter of MPlayer converting it to
> 2.0by default.  If you want MPlayer to play with 6 channels, you can
> add the
> following line to your ~/.mplayer/config:
>
> channels=6
>
> I have this in my config on Mac OS X.
>
> m0ri
>
> On Jan 15, 2008 9:07 AM, galenz at zinkconsulting.com <
> galenz at zinkconsulting.com> wrote:
>
>>
>> On Jan 15, 2008, at 5:53 AM, Dominik 'Rathann' Mierzejewski wrote:
>>
>>> On Tuesday, 15 January 2008 at 14:10, galenz at zinkconsulting.com  
>>> wrote:
>>>> I seem to be unable to get 5.1 audio output working with mplayer.  
>>>> All
>>>> I get is 2 channel audio with mplayer. I am using analog 5.1 out
>>>> hardware, properly configured in Audio MIDI setup, and 5.1 is  
>>>> working
>>>> perfectly with VLC, QuickTime, etc.
>>>>
>>>> Here's the audio-related messages when playing a file I was  
>>>> recently
>>>> testing:
>>>>
>>>> [mkv] Track ID 2: audio (A_DTS) "English DTS 5.1 (1.5mbps)", -aid
>>>> 0, -
>>>> alang eng
>>>>
>>>> Opening audio decoder: [libdca] DTS decoding with libdca
>>>> Stream with high frequencies VQ coding
>>>> AUDIO: 48000 Hz, 2 ch, s16le, 1536.0 kbit/100.00% (ratio: 192000-
>>>>> 192000)
>>>> Selected audio codec: [dts] afm: libdca (DTS-libdca)
>>>>
>>>> I even recently recompiled mplayer with libdca, thinking that  
>>>> perhaps
>>>> that would have some effect. It did not.
>>>>
>>>> How can I get 5.1 audio working? My video / audio files are not
>>>> corrupted and play great in other players. But mplayer only gives
>>>> me 2
>>>> channels.
>>>>
>>>> Ideas?
>>>
>>> -channels 6
>>>
>>> Regards,
>>> R.
>>
>> That was too easy!
>>
>> Any reason mplayer doesn't detect 5.1, like all other players?
>>
>> -Galen
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