[mythtv-users] Why does going to live TV take so long?

[Stef Coene]

On Friday 10 March 2006 18:58, Marco Nelissen wrote:
> Well that's the question then: does it really take 6 seconds for the
> tuner to tune to a channel? The time to change the channel on a DVR
> should be only a fraction of a second longer than the time it takes
> the tuner to tune to a new channel, but If PC-based tuners are that
> much slower than the tuners you find in TVs (or Tivos) then that would
> certainly explain why MythTV takes so long.
> I doubt that's the case though, since someone mentioned earlier that
> MythTV has a 3-second buffer of data. If that's the case, it would
> account for the bulk of channel change time.
I'm also surprised that there is a 3-second buffer.  I had a software based 
tuner card and now I use a PVR500.  Changing channels takes less then a 
second with both cards.  I never used my stopwatch, but it was more 0.3 
seconds or so.
This was for 0.18.  I "upgraded" to 0.19 and changing channels takes now more 
then 3 seconds :(

And let's say mythtv wants a 3 seconds buffer.  Isn't it possible to change 
channels and start playing immediate but with a starting speed of 0.9x?  
After some time, when the time lag is 3 seconds the speed goes up to 1x.


Stef