[mythtv-users] channel changing speed, is 3 seconds normal?

[Boyd II, Willy]

Are you using some form of IR Blaster, or a serial connection to the directv
box?  At least for a serial control, I really don't think the external
changer is the bottleneck.  (But then if those using a builtin tuner have
fast channels, then I guess I'm completely wrong).  If I change channels on
the command-line using my serial control the change is very fast.  So this
operation shouldn't be slow when handled by Myth either.

- Willy

-----Original Message-----
From: Curtis Stanford [mailto:curtis at stanfordcomputing.com] 
Sent: Tuesday, September 30, 2003 11:01 AM
To: Discussion about mythtv
Subject: Re: [mythtv-users] channel changing speed, is 3 seconds normal?


Mine is at least 6 seconds on an external DirecTV box. My suggestion was to 
start the external channel change operation and, while it's happening, do
the 
ringbuffer stuff. No reason they can't happen in parallel.

On September 30, 2003 06:52 am, Michael J. Sherman wrote:
> My channel changing process is also very long; equal or greater than 3 
> seconds.  Also, sometimes it'll just miss a number, so it'll attempt 
> to change to say 106, but only '1' and '6' gets sent, or sometime '1' 
> and '0'.  It's random, and quite odd.
>
> jose rubio wrote:
> > On Mon, 2003-09-29 at 22:24, Sergio M. Ammirata wrote:
> >>I followed a thread regarding slow channel changing speed. That 
> >>thread suggested using either reiserfs or xfs for the cache 
> >>partition. I tried both and it takes about 3 seconds to change to 
> >>another channel in either. Is this normal?
> >>
> >>Is there any way to speed it up?
> >>
> >>I am using a pundit with a custom OS build. My CPU while watching 
> >>live TV is under 2%. I have a WD 160HD with DMA enabled.
> >>
> >>Thanks in advance,
> >>
> >>Sergio Ammirata
> >
> > Yep, 3 secs is about right.  I'm not particularly happy with it and 
> > I'm sure there are things that can be done about it but the people 
> > that know what to do are too busy working on the nuts-n-bolts of the 
> > program.
> >
> > I do know a little c myself...lol...but about all I could do is to 
> > put one of those "microsoft hour glass" cursors in the screen while 
> > the channel changes...
> >
> > BST, I've timed Tivo, it takes less than 2 secs, closer to 1 second 
> > actually.  There's no reason why that speed (even better) cannot be 
> > achieved by myth...  We just need to keep working at it...
> >
> >
> > -jose-

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