[pulseaudio-discuss] Weak bass in stereo mode – possibility of virtual 2.1 sound profiles

[Alexander E. Patrakov]

пт, 5 окт. 2018 г. в 21:55, Karl Ove Hufthammer <karl at huftis.org>:

>
> But, strangely, real 5.1 material are now somewhat messed up. I use the
> wonderful
>
>    hd_dts_hd_master_audio_sound_check_5_1_lossless.m2ts
>
> video file (available several places on the Web – I’m not sure what its
> original Web site is) as a test file. The front left/right/centre sounds
> are OK. But when the rear right sound is played, the sound is mainly
> coming from my *front* right speaker (though *some* sound is also coming
> from my rear right speaker). And the sound volume is much when playing
> the sound is much lower than for the front left/right/centre sounds. For
> the rear left sound, a similar thing happens; i.e. the sound is mainly
> coming from my *front* left speaker.
>
> I don’t understand why this is happening. Shouldn’t
> ‘remixing-use-all-sink-channels = no’ just affect *upmixing* of sound,
> and leave 5.1 material alone?
>

This is a known bug that appears because there are two 5.1 standards:
proper 5.1 and 5.1 Side. The video player (I guess you use mpv) says: the
extra two channels have to come from the side. But your system does not
have speakers there, it has them on the rear. So PulseAudio attempts to
remix. In fact, sound both with and without remixing-use-all-sink-channels
is wrong. Solutions: either upgrade to a 7.1 system or use a different
player that doesn't care about Side and Rear. Totem or anything other
GStreamer-based should work fine.

But in reality this should be fixed in PulseAudio code. Maybe I will work
on it next week.

-- 
Alexander E. Patrakov
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