[FFmpeg-user] Decode Dolby Pro Logic II

Paul B Mahol onemda at gmail.com
Fri Sep 6 12:29:17 CEST 2013

On 5/10/13, Martijn van Beurden <mvanb1 at gmail.com> wrote:
> 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
> sample-cut.WAV
> 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':
> http://www.dolby.com/uploadedFiles/Assets/US/Doc/Professional/209_Dolby_Surround_Pro_Logic_II_Decoder_Principles_of_Operation.pdf
> Anyway, thanks in advance

Did you tried mplayer surround filter?

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