[mythtv-users] Is it possible add delay to sound?

[Marco Quezada]

On Oct 30, 2012 8:05 PM, "Scott Harris"
<scott.harris0509@<scott.harris0509 at gmail.com>
gmail.com <scott.harris0509 at gmail.com>> wrote:
>
> > I bought new tv.
> >
> > It has very long delay when it processes picture. I realised that sound
is
> over
> > 100ms ahead picture.
> > I have A/V Amplifier connected to my pc with digital coaxial cable. TV
is
> > connected with dvi-hdmi cable.
> >
> > I can add up to 80ms delay from amplifier, but it is not enought. I can
> also
> > reduce picture processing time if I select "PC-mode" from tv, but after
> that
> > motion looks horrible. I have also tried to take off all picture
> processing
> > options from tv, but I need to keep "Film mode" on, that picture looks
> good.
> >
> > So, is it possible to add delay to sound from alsa configuration? I
don't
> have
> > pulseaudio, since I use minimyth. It also has no graphical desktop.
> >
> > Myth seems to have sound syncronisation in osd, but it does not affect
at
> all.
> > I assume it does not work with digital sound output?
> >
> > Regards, Kane
>
> There is an audio sync option in Myth.  Press M during playback, Audio ->
> Adjust Audio Sync and adjust up or down to get the desired sync.  I
believe
> your selection will "stick" until you change it again, though someone else
> may want to confirm that.
>
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I used to have a similar issue to what you are describing. I had to keep
adjusting the sound synchronization. Then on a seemingly unrelated issue I
came across this link:

http://www.mythtv.org/wiki/Frame_display_timing

My frontend was using usleep for its timing during playback but then I got
the real time clock (RTC) device configured so Myth could run with it and
now the playback is fully synchronized.

Hope it helps.

-Marco
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