[MEncoder-users] Spliting bilingual audio into separate streams

[Duncan Webb]

Nico Sabbi wrote:
> Duncan Webb wrote:
> 
>> Guillaume POIRIER wrote:
>>  
>>
>>> Hi,
>>>
>>> On 12/20/06, Duncan Webb <duncan-mp at linuxowl.com> wrote:
>>>   
>>>> Hi all,
>>>>
>>>> I hope that this is not a stupid question, having looked around a bit
>>>> the answer is not too easy to find.
>>>>
>>>> A mpeg stream recorded from the television sometimes has bilingual
>>>> audio, i.e. the left channel is English and the right channel is
>>>> German,
>>>> rather than two audio streams. Is it possible to separate the audio
>>>> with
>>>> mencoder into to separate streams with one language coming out from
>>>> both
>>>> speakers?
>>>>
>>>> And if so what are the correct options?
>>>>     
>>> You should be able to get what you want with audio filters -af
>>> channels and -af pan
>>>   
>>
>> Must admit, I had already figure out channels. I didn't realise that the
>> pan filter could do this though.
>>
>> Something like, for channels:
>> -af channels=2:2:0:0:0:1 pan 2:0
>> -af channels=2:2:1:1:1:0 pan 2:1
>>
>> I just don't understand the pan option, who can read and understand
>> this, and what do negative value mean?
>> pan=2:.32:.32:.39:.06:.06:.39:.17:-.17:-.17:.17:.33:.33
>>
>>  
>>
> 
> maybe -af pan=1:1:0 and -af pan=1:0:1

1: one output channel
1: 100% of channel 1
0: 0% of channel 2

That will split out mono on one speaker?

How about mono on two or more speakers?

Thanks again,
Duncan