On Mon, Aug 08, 2016 at 06:27:44PM +0200, Carl Eugen Hoyos wrote: > 2016-08-07 2:08 GMT+02:00 Michael Niedermayer <mich...@niedermayer.cc>: > >> On a somewhat related matter: I was browsing through the matrix encoder > >> in libavresample/audio_mix_matrix.c, and possibly rediscovered the bug > >> in https://trac.ffmpeg.org/ticket/4175 . Also, the 5-channel coefficient > >> seems to disagrees with Dolby (see the notes I wrote at some point while > >> editing the Wikipedia section in > >> https://en.wikipedia.org/wiki/Talk:Dolby_Pro_Logic#Source_of_the_DPLII_encoding_matrix.3F). > > > > is this issue also affecting libswresample ? > > The fact that users have reported several times that our Dolby downmix is not > correct / not perfect indicates that there is an issue affecting > libswresample, no?
There are 2 things here. first, some of the downmix requires a phase shift, there is no implementation of that in either resampler. the way i understood the mail here is that the coefficients themselfs are wrong too, that should not really be in case of libswresample, but of course a wrong reference might have been used or whatever [...] -- Michael GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB Never trust a computer, one day, it may think you are the virus. -- Compn
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