Channel Up/Down Mixing

[GoogleCodeExporter]

Describe the issue you're having:
Not everyone is running a fancy AVR, so simple functionality to up/downmix 
audio would be required for those people to enjoy the full spectrum of the 
audio.

Implementation Notes:
ffmpeg offers stereo-downmixing for some formats, this feature should be 
utilized before attempting to downmix these formats ourself.

Original issue reported on code.google.com by h.lepp...@gmail.com on 20 Jul 2011 at 7:47

• Blocking: #50

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[deleted comment]

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(I somehow manage to delete previous comment, which was exactly the same)

Would you consider adding a full channel redirection matrix (a-la ffdshow)? 
Seems to be more useful in some cases, and perhaps not much added work once you 
dig into channel mixing anyway,

Original comment by adam...@gmail.com on 1 Aug 2011 at 12:42

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Original comment by h.lepp...@gmail.com on 2 Aug 2011 at 2:40

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A full channel redirection matrix is good and all, but a simpler function to 
up/downmix would be better to start off with.

Original comment by thorese...@gmail.com on 1 Oct 2011 at 3:36

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libswresample in the ffmpeg project shows potential, and its downmixing 
functionality is already pretty good.

I've put in a request for them to expose configuration for the channel matrix 
directly to applications that want to use it, which would allow me to just use 
that library and feed it with a matrix.

Original comment by h.lepp...@gmail.com on 17 Nov 2011 at 12:31

[GoogleCodeExporter]

A basic first draft of (down-)mixing functionality has been implemented.

See http://forum.doom9.org/showthread.php?p=1580617#post1580617 for details.

Original comment by h.lepp...@gmail.com on 29 Jun 2012 at 8:50

• Changed state: Started

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Please at least add a minimum of up-mixing too for Stereo to Quadraphonic

Original comment by Mercury...@live.com on 13 Oct 2014 at 2:18

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Please add a 5.0 output speaker option in LAV audio filter mixing-tab.

There is a 4.0 and a 5.1 option, but not one that characterises my 5.0 setup:
2 fullband speaker for left and right,
3 small speakers for mid and surround left and right

I don't have a receiver that can handle DTS HD and TrueHD, therefore I let LAV 
decode these formats to 6-channel PCM. With this option I can redirect the LFE 
channel to the full band speakers and raise the bass volume to the correct 
level.

Original comment by bouwe.s....@gmail.com on 31 Mar 2015 at 6:09