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

[Albert Santoni]

It takes me 2 seconds to change channels (I used a stopwatch...)
I've upgraded this rig (once mobo/cpu, once HD), and the only thing that
made a difference was the mobo/cpu. I've run Redhat 8 and now Mandrake 9.1,
and used EXT3 on both (on Redhat I had the partitions mounted with noatime,
but it didn't make a difference with channel changing, as far as I could
tell.)
Previously, I had the ring buffer on one harddrive and the recording on
another, and now I have them both on one drive - but that didn't (and
shouldn't) make a difference.

Albert Santoni

P.S. - I use a remote...

----- Original Message -----
From: "Curtis Stanford" <curtis at stanfordcomputing.com>
To: "Discussion about mythtv" <mythtv-users at mythtv.org>
Sent: Tuesday, September 30, 2003 1:27 PM
Subject: Re: [mythtv-users] channel changing speed, is 3 seconds normal?


> Yes, I have done the change channel test directly to a tv and it is just
as
> fast as using a remote or something. Must be something with my backend
> although it is a pretty fast machine (Athlon 2200) with what I hear is a
> pretty fast filesystem (reiserfs).
>
> On September 30, 2003 10:53 am, Boyd II, Willy wrote:
> > 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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