[FFmpeg-user] Decode Dolby Pro Logic II

Martijn van Beurden mvanb1 at gmail.com
Fri May 10 15:14:02 CEST 2013

On 10-05-13 07:36, Carl Eugen Hoyos wrote:
> Paul B Mahol <onemda <at> gmail.com> writes:
>>> I don't think this is implemented, could you provide
>>> a sample?
>> Wouldn't decoding be just reverse of downmixing (thus
>> upmixing) as done in libswr and explained on wikipedia?
> I like samples;-)
> (I prefer them even over Wikipedia articles.)
> Carl Eugen

I uploaded a sample to upload.ffmpeg.org/incoming/Dolby Pro Logic II 

I thought I got it yesterday after some scripting with SoX, but the 
result was disappointing. Today I discovered there was something wrong 
with the parameters. I also found this document that made me think it is 
more than just 'inverting the matrix': 

Anyway, thanks in advance

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