[MEncoder-users] 5.1 sound

[Giacomo Comes]

On Wed, Nov 07, 2007 at 01:39:37PM +0100, Dominik 'Rathann' Mierzejewski wrote:
> On Wednesday, 07 November 2007 at 01:18, Sergio wrote:
> > Dominik 'Rathann' Mierzejewski escribió:
> > 
> > Hi:
> > 
> > [automagically remap 5.1 sound when source is not AC3]
> > > Or use the attached patch to do it automagically.
> > 
> > Wow! Really fast! Thanks!
> > 
> > Will this patch be added to SVN?
> 
> Not this one. It has already been rejected, because it slows down playback.
> Not by much, but still.

The patch was not rejected, simply it was not applyed 
because Corey was busy with other work and the discussion
just stopped.

Just to remind:
A first discussion starts here:
[PATCH] channel reordering for 6ch audio
http://lists.mplayerhq.hu/pipermail/mplayer-dev-eng/2006-July/044844.html

Later continued here:
[RFC] 6-channel AAC and channel reordering
http://lists.mplayerhq.hu/pipermail/mplayer-dev-eng/2006-October/046963.html

And the last thread was:
[PATCH] audio channel remapping
http://lists.mplayerhq.hu/pipermail/mplayer-dev-eng/2006-November/047269.html

Essentially there are two set of patches that can handle the automatic channel
remapping:
http://lists.mplayerhq.hu/pipermail/mplayer-dev-eng/2006-October/046988.html
(solution A: the de/encoders to do the reordering)
http://lists.mplayerhq.hu/pipermail/mplayer-dev-eng/2006-November/047269.html
(solution B: channels remapping is done via filter)

The discussion was about having the audio channels stored in planar format
instead of interleaved format. In this way the remapping does not add any 
overhead.

Since the audio channels are still stored in interleaved format
and channels reordering IS a real need, it would be good to apply one
of the two patches.
If and when audio channels format is going to change, the patch can be
removed.

I have worked on the solution A, but I prefer solution B.

Is it time to resurrect the thread on dev-eng?

Ciao
Giacomo