[mythtv-users] channel change delay with PVR350

[Brian Stults]

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!