[mythtv] Switched Digital Video Problem

David Engel david at istwok.net
Sat Jul 31 17:03:45 UTC 2010

On Mon, Jul 26, 2010 at 04:30:23PM -0500, David Engel wrote:
> On Mon, Jul 26, 2010 at 03:48:50PM -0400, Jarod Wilson wrote:
> > Does the AVC command to get power status work on your box? (And
> > obviously, if yes, then does it prevent the auto-switch). Or maybe
> > poke at volume a bit (which should be a no-op if you've got digital
> > pass-through set, right)? Beyond that, off the top of my head, a quick
> > info/exit pair is the next best thing I can think of.
> > 
> > http://code.google.com/p/stb-command/wiki/Commands may yield further ideas.
> Cool.  This looks like just what I need.  

I'm following up with my resolution so it will be in the archives for
others to stumble across.

Using stb-command to send the power status command didn't work.  The
STB still switched away eventually.

Using stb-command to send the exit command partly worked.  The STB
didn't switch away, but the video and audio eventually froze and
wouldn't come back until the channel was changed manually.  It's kind
of like the STB was satisfied not to switch away, but didn't inform
upstream to keep sending the multiplex.

Using stb-command to send the display_info command immediately
followed by the exit command worked.  I ran multiple several-hour
tests and the STB did not switch away.  This does result in the STB's
info OSD being visible for a few frames sometimes, but I guess I can
live with that.

The approach I've currently taken is to do this all in the channel
change script.  The script first kills any background task from a
previous invocation and starts a new background task to do the
display_info/exit commands every 2:45.  It then changes the channel
and returns to Myth.

David Engel
david at istwok.net

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