[mythtv-users] HDMI keep alive, maybe via sending silent audio?

John Veness John.Veness.mythtv at pelago.org.uk
Fri May 27 15:56:34 UTC 2016


As a follow-up to this thread, I've mostly given up on this. The 
occasional time when MythTV playback would start while "aplay" was 
playing a few seconds of silence was annoying.

I tried to add a MythTV System Event Handler, to do "pkill aplay" when 
playback starts, but that didn't seem to work. I didn't really look into 
why. It may be that the pkill itself didn't work, or that it was taking 
too long to pkill the process, and the sound device was still in use by 
the time MythTV playback started. In any case, the whole thing seemed 
clunky.

One more thing, I reported earlier that when I had an HDMI cable from my 
HTPC to the soundbar, and another HDMI cable out from the soundbar into 
the TV (so using the soundbar as an HDMI switcher as well as speakers), 
I had to add 350ms of audio delay to MythTV, otherwise sound would come 
out before the pictures. I have experimented some more and although that 
is the case, any other HDMI source I've tried (Roku, PS3, Xbox 360) does 
not have this problem. If I plug my HTPC directly into the TV I don't 
have any problem either.

I can't work out why MythTV would act differently when played "through" 
the soundbar like that. Anyone have any ideas? I'm using Intel graphics 
if it makes a difference. I haven't done any more tests like using VLC, 
or looked in frontend logs.

John

-- 
John Veness, MythTV user, UK, DVB-T

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