[mythtv] Shouldn't MythTV disable the tuner between switching inputs?

Sam Logen starz909 at yahoo.com
Sun Jan 6 23:39:56 UTC 2008


Hi Rudy and Daniel, I'm just getting your emails now,
I didn't spot them earlier, sorry.  And thank you for
taking an interest this.


> Are you certain on this? What i do remember is that
> it cannot switch 
> while encoding... In other words, the driver will
> refuse to switch 
> inputs while the MPEG2 engine is active, as doing
> that will cause 
> incorrect MPEG streams. When you switch with the
> MPEG engine not active, 
> there should be no problem. Can you point to the
> relevant ivtv posting?

> Do you have any information on when the
> driver was changed
> > and do you know if this only applies to the
> PVR-150 or the whole
> > range of ivtv cards?

Well, wouldn't the mpeg2 engine be active in Livetv
anyway?  I don't know the process mythtv takes when
switching inputs, but I'd asked about this on the
mythtv-users list, and they claim that it is this
feature of the ivtv driver that prevents this.  The
relevant emails can be found here:

http://www.gossamer-threads.com/lists/mythtv/users/304472

Clicking on the link in the page will display Hans'
conversation on the subject.

> Turning off the tuner would
> introduce a channel
> > changing delay for all MPEG-2 recording cards

What kind of delay are we talking about?  When I used
the ivtv utility to disable the tuner, it took less
than a second.  Granted that you'd have to adapt the
code to be hardware independent.  Can we test the code
to see just what kind of delay we are talking about,
and if it is worth it or not?

Best regards on the New Year,
Sam


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