Catch-Up Stutter

[netdale]

I've used GBPVR for the past few weeks and have everything figured out but stuttering or hesistation every few seconds when I "catch-up". Its a simpe config;

PVR150MCE (latest drivers - what drivers should I be using?).
XP Pro
3.0Ghz P4D
2GB RAM
NVIDIA 256meg 7600

NVIDIA PureVideo
FFDSHOW
Reclock (to do jitter correction -- otherwise things won't sync -- this is NOT the problem -- with DirectSound/Waveout the same issue occurs).

If I pause the LiveTV (in encode-pass through) and then unpause it, everything is perfect. The issue only occurs when I hit ctrl+o to catch-up and watch current TV. This also occurs if I disable LiveTV mode and always use time shift mode.

Its obviously not a performance issue....? I have the horsepower. GBPVR has subtitles disabled (since that could be it according to my forum searches) and GBPVR is set at a High priority.

Could it be that the PureVideo decoder doesn't have a high priority? It just seems like there is some sort of starvation and the PVR150MCE ins't being consistent. Like I said, when I'm watching TV with a delay (not caught up) things work fine, no PureVideo works fine (On a seperate issue in time shift mode the PureVideo taskbar icon doesn't show up but GraphEdit confirms its running -- or so I believe).

Ideas?

Thanks, Dale

[Brian_W]

A lot of people have had problems with FFDSHOW installed. Try uninstalling that and see. Also play with your decoders, sometimes it takes a bit of fiddling to find the sweet combination.

Brian

[MicroSark]

I have noticed this too. I don't use FFDShow and I've tried a multitude of decoders, including IV Non-Css, standard IV and DSCaler. Nothing seems to help.
Just for comparison I've installed MediaPortal and compared using the same decoders etc, and MP doesn't display the same problem.
BTW I'm not deserting GBPVR for MediaPortal - MP still sucks (and blows) - great interface but has the breaking strain of a Kit-Kat.

[sub]

When you do a catch up it currently just to 1.5 seconds from the current record point in the stream. This may be too close to the end, which causes problems reading from the file. I'll increase it to 2.5 for the next release. Hopefully that'll help.

[netdale]

Could I test this Sub? Thanks, Dale

[Carlito]

I have noticed this with my PVR-150 card as well (although I don't think the card matters) I usually just skip back a second or so and the stuttering stops.

[sub]

Could I test this Sub? Thanks, Dale

You'll have to wait until the next release. My current release is no longer binary compatible with v0.98.8, so I'm not able to provide a patch.

[csy]

FFDSHOW
Reclock (to do jitter correction -- otherwise things won't sync -- this is NOT the problem -- with DirectSound/Waveout the same issue occurs).

Never ever use Reclock. It definately causes catch-up skips at a regular interval. It is fundamentally flawed for LiveTV because the master clock originates from the broadcaster and DirectShow MUST sync to the incoming frame-rate. Reclock is not required for GBPVR. You need to find the root-cause of your sync issues without using Reclock.

FFDShow is very prone to cause Directshow problems.

I strongly recommend you uninstall both FFDShow and Reclock, then start diagnosing from there.

edit:
Just thinking further, the audio renderer is tied-in with directshow timing, so make sure GBPVR audio renderer is "system default"

[sub]

Yeah, I'd have to agree with csy. I've seen nothing but problems come out of reclock. ffdshow is also a common cause of problems for users.

[netdale]

Good advice; Removing FFDSHOW and ReClock cleared up the problem but I don't have the up mix to 5.1. Using GraphEdit I confirmed its going from the demultiplexer to the standard MPEG-2 decoder. The reason I used FFDSHOW is that I want to take the stereo and mix it so all speakers (.8 in the back 2 channels, and .6 from each side for the center channel). The other problem is my speaker set needs this all via the SPDIF so FFDSHOW did this....with the delay. Any other utilities that exist where I could mix but won't cause the sound delay issues? AC3Filter creates the same delay issues after a few minutes. Ideas? Thanks for the new release Sub.

Dale