[mythtv-users] channel change delay with PVR350

[Bill Bradley]

On Friday 13 February 2004 07:22 am, Brian Stults wrote:
> Malcolm wrote:
> > ----- Original Message -----
> > From: "Brian Stults" <bstults at crim.ufl.edu>
> >
> >>Hello,
> >>
> >>When I change channels in mythtv, or if I change the setup and use the
> >>cable box to change the channel, I get a pretty serious delay.  I'd say
> >>it's about 2 seconds.  This makes flipping through channels impossible.
> >>  I'm just wondering if this is normal, or if there might be something I
> >>can do to fix this.
> >>
> >>There was a thread a while back about this and David Engel wrote some
> >>patches to help with this, among other things.  That thread ended back
> >>in early January, though, so I suspect that the changes are already
> >>rolled into 0.14.
> >>
> >>
> >>From what I understand it's normal.  Myth has to encode the signal on a
> >
> > capture card, buffer it, decode for your viewing.  The process causes
> > aprox 2 to 3 sec delay.  Commercially available PVRs like the Tivo and
> > Replay also have that delay.
>
> Long ago I had an AverMedia TVPhone tuner card.  It was a BT848 card.
> When I used xawtv to view TV with it, I could flip really fast through
> the channels.  I recognize that mythtv does a whole lot more than xawtv,
> but why is it that much different for just watching TV?
>
> I'm sure I'm just not understanding something about the internals of
> mythtv, but I'm curious.  Channel flipping is also a big part of the WAF.
>
> Thanks again!

Myth is actually encoding and buffering the live tv while xawtv is just 
diplaying.