[mythtv-users] 8 seconds to change channel on a PVR350? normal

[Ryan]

I have a PVR-250 that had a similiar issue. I noticed that when I
increased the quality under the Recording Profiles for LIVE TV, the
channel changing time was decreased. I figured maybe this was because the
hardware has to do less compression and the video stream is closer to raw
format. Of course this makes for more disk I/O and the buffer fills up
quicker, but it did make a differences for me. It takes about 2-3 seconds
and used to take 4-5.

regards,
Ryan



> On Mon, Mar 08, 2004 at 07:49:34AM -0500, jose rubio wrote:
>> On Sun, 2004-03-07 at 00:38, Darren Richards wrote:
>> > > I know this issue has been beaten to death so many times that it's
>> not funny, but I just wanted to ask if a 7-8 second delay is
>> normal for changing channels on a PVR350? Reading the archives
>> make me believe it should be in the 2-3 seconds range... but I
>> also find (like many others) that I simply cannot fast-forward to
>> any point further than 4-5 seconds behind real time, which I
>> assume is the cause of the first problem and also a safety delay
>> for software encoders. If so, is this changeable somewhere in the
>> settings, or defined in a header file somewhere?
>> > >
>> > > Of major importance here is that the 350 is hooked directly to my
>> analogue cable, so there's no delay for external tuners.
>> > >
>> > > This is all on v0.14 BTW. Simply haven't had enough free time from
>> work'n'stuff to even attempt the CVS yet. :)
>> > >
>> > > Also, I just read in the archives (which is a goldmine with
>> well-hidden nuggets) that switching from ext3 (which I currently
>> use) to f.x. ReiserFS can make a big difference here, as well as
>> save quite a few bytes on the /mnt/myth/store partition... which
>> will have to wait until tomorrow since it's currently 3 in the
>> morning and experience tells me not to change filesystems on 140GB
>> partitions when the brain is not all there. =)
>> > >
>> > > Sorry for rambling on, but maybe all of this can be helpful for
>> someone else...
>> > >
>> > > / Niklas
>> >
>> > 7-8 seconds seems a little long.  I recently switched from using the
>> pvr350 tv-out to a gf4mx tv-out.  I'm still using the 350 for
>> capture.  With the 350 tv-out, changing channels took 4-5 seconds.
>> Now it takes about 2 seconds.  I'm using ext3.
>> >
>> > -darren
>> >
>> > ----
>> yeah, i don't think it's the filesystem.  i've used ext2 and now ext3
>> with both a 250 and a 350 together using the 350 tv-out and my channel
>> change time is always been about 2-4 seconds.  I run myth-cvs
>> though...
>>
>>
>> -jose-
>>
>
>
> I just switched from an ext3 filesystem to xfs and don't really notice
> any difference. Maybe I need to tune it differently?  (I went with the
> default settings).
>
> Chris
>
>
>>
>
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Ryan