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<div class="moz-cite-prefix">On 12/02/16 13:44, Phill Edwards wrote:<br>
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<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">> I
purchased a new receiver in November, an Onkyo TX-NR646.<br>
> I send the signal over HDMI from the nVidia card
through the amp to<br>
> the TV. So the amp handles all the audio, passes
through the video.<br>
> So far that's all sweet.<br>
><br>
> However...<br>
><br>
> Whenever I playback something via mythtv, video
appears immediately on<br>
> the TV, and then there's a 3 to 4 second delay
before sound starts<br>
> up. So if you're watching a music clip, or a TV show
with dialogue at<br>
> the start, you have to rewind to hear the whole
thing.<br>
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<div>I have the same receiver and I have the exact same
experience. I thought it was just "normal" and the way it
is. If you hear back from Onkyo Support I'd live to hear
what they say.<br>
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<br>
Ok, here's what I've found today ...<br>
<br>
Configure pulse audio for your HDMI settings. You might already
have it so, but mine was still pointing at SPDIF.<br>
<br>
And In your /etc/pulse/default.pa comment-out the module that
suspends it on idle:<br>
e.g.:<br>
# load-module module-suspend-on-idle<br>
<br>
Reboot or restart pulse audio. Whatever ensures the new settings
are read.<br>
You can check it with:<br>
# pacmd list-modules | grep -i suspend<br>
There should be no output.<br>
<br>
What seems to be happening (for me), is that even though MythTV is
configured to use alsa:HDMI, it's still doing <something> with
Pulse Audio, and it looks as if Pulse Audio is the thing sleeping
the HDMI connection. So we've configured PA *not* to do that.<br>
<br>
With this configuration, I now have it down to a ~ 1 second delay on
start.<br>
The HDMI light is always on in the receiver, except when a new video
starts, where it flashes for a second. This is the ~1 second delay.<br>
I guess that something is quickly dropping the HDMI link on start.
Not sure yet. Maybe the interaction between Alsa and PA?<br>
<br>
I did set my MythTV audio output to alsa:default - which uses pulse
audio. This gave me zero delays, but when I tried to play something
with DTS-HD audio, there was no sound, playback was very jerky, and
if I stopped playback, mythtv locked at a black-screen.<br>
<br>
I might do a bit more research on Pulse Audio and DTS, DTS-HD etc.
as this gave a better result.<br>
<br>
I tried killing Pulse Audio, but mythTV frontend shows an error
dialogue and restarts it (even if not configured to use it).<br>
I am kind-of tempted to remove pulse audio totally.<br>
<br>
So, some progress.<br>
<br>
cheers,<br>
-kt<br>
<br>
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