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

[Boyd II, Willy]

Do you have the capability of watching "really live" tv on your backend with
xawtv or something similar?  I know this can be tricky if you're using a
pvr-250, but can be done.  Or for that matter, just temporarily hook up your
directv box to a tv.  Then run something like "changechannel_command 100"
and you should see the box change to channel 100 pretty fast.  That's how I
tested anyway...

- Willy

-----Original Message-----
From: Curtis Stanford [mailto:curtis at stanfordcomputing.com] 
Sent: Tuesday, September 30, 2003 11:43 AM
To: Discussion about mythtv
Subject: Re: [mythtv-users] channel changing speed, is 3 seconds normal?


I'm using serial. I'm not really sure which part is slow but something sure 
is. I'm using a backend with 2x80G drives in raid 0 with reiserfs.

On September 30, 2003 10:14 am, Boyd II, Willy wrote:
> 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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