[FFmpeg-devel] [PATCH] [RFC] libavfilter HRTF/room acoustics filter [1/2]

Carl Eugen Hoyos ceffmpeg at gmail.com
Mon Aug 8 19:27:44 EEST 2016

2016-08-07 2:08 GMT+02:00 Michael Niedermayer <michael at 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?

Carl Eugen

More information about the ffmpeg-devel mailing list