[MPlayer-users] 6 channel audio, 2 channel card

[Paolo Bolzoni]

I found fairly good this configuration command line:

mplayer -channels 6 -af-add
pan=2:0.33:0:0:0.33:0.24:0:0:0.24:0.4:0.4:0.06:0.06  6_Channel_ID.wav

Thanks for helping!

On Tue, Dec 24, 2013 at 5:26 PM, Andy Furniss <adf.lists at gmail.com> wrote:
> Paolo Bolzoni wrote:
>>
>> Dear list, I wanted to see a movie with 5.1 audio in my laptop, but
>> the dialogues were too low so I wanted to play with volumes with the
>> -pan- audio filter.
>>
>> I downloaded the 6 channel .wav file from (1) and something is
>> wrong.
>>
>>
>> If I play it in my desktop system with a 5.1 system it works fine,
>> strangely also my 2 channel laptop I hear all the channel a part of
>> the subwoofer.
>>
>>
>> Anyhow, to see what is the channel order I tried this:
>>
>> -af pan=2:0:0:0:0:0:0:0:0:0:0:0:0 , as expected everything is silent
>> -af pan=2:1:0:0:0:0:0:0:0:0:0:0:0 , something is strange; I hear
>> from the left channel the front left, center, and back left voices.
>> As far as I understood I should only hear only one channel from its
>> correct speaker. -af pan=2:0:1:0:0:0:0:0:0:0:0:0:0 , same voices as
>> before from the right channel. This is expected since the previous
>> results, but it is strange.
>>
>>
>> Now, what can possibly happening? Is there some kind of downmix
>> before the audio filter? Can I disable that?
>
>
> If you want boost center do this -
>
> mplayer -channels 6 -af pan=2:0.4:0:0:0.4:0.2:0:0:0.2:0.5:0.5:0.1:0.1
>
> The two 0.5 s are normally 0.3 (so it could in theory clip - probably
> not much in practice)
>
> Maybe the wierdness in your tests is because by default mplayer does
> downmix (or for ac3/dts actually requests 2 channels from the codec) so
> you need -channels 6
>