[mythtv-users] More on Audio over HDMI, Volume Control and AC3 Passthrough

Allen Edwards allen.p.edwards at gmail.com
Thu May 28 04:48:56 UTC 2009

On Wed, May 27, 2009 at 9:41 PM, Jean-Yves Avenard <jyavenard at gmail.com>wrote:

> Hi
> 2009/5/28 Allen Edwards <allen.p.edwards at gmail.com>:
> > I do not believe you can get the volume control to work with passthrough.
> >  Passthrough is just that, it passes the signal through and does not
> decode
> > it thus it cannot change the volume.  In addition, you probably actually
> do
> > not want Myth to change the volume as it would degrade the audio signal.
> Yes you can with some mods.
> My packages are built with this ticket:
> http://svn.mythtv.org/trac/ticket/6279
> It allows software volume control.
> To activate it you set the mixer to be "software"

Nice patch.  I assume you decide the spdif, then modify the volume, then
encode it again.  Then it goes to the TV where it is decoded again.  This
decode/ encode/ decode leads to a loss of quality but that may not be
important if you are just listening over TV speakers.  For purists, you
would want to just pass the signal through.  If it is more important to
control the volume than to have the least possible distortion this looks
like a nice way to go.

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