[mythtv-users] AC3 software decoding too quiet

[Jean-Yves Avenard]

Hi

On 17 November 2010 05:20, Thomas Börkel <thomas at boerkel.de> wrote:
> Thanks! Does that mean, it is fixed by this patch or otherwise in 0.24?
>
> Currently, I have my own patch, which just makes MP2/3 the default format.

Not a fix as such.

But I've added the option to force the use of Myth's own downmixer for
all codecs.

By default, myth let ffmpeg do the downmixing for all Dolby codec, as
they can very efficiently downmixed 5.1 AC3 to 2.0 AC3 (it's part of
the codec specification).

When active, the 5.1 audio is decoded then downmixed to stereo. This
downmixer doesn't have the volume issues has the ffmpeg's one.

On my system, listening to 5.1 AC3 passthrough, or the downmixed one
on a stereo system sounds just as loud that way.

http://svn.mythtv.org/trac/changeset/27370

JY