Live preview mode & system specs

[wannabepvr]

I have 2 machines running GBPVR.

#1 - P4 2.0GHz, 400FSB, 512 MB, MX440 64MB - monitor display
#2 - Cel 2.55GHz, 533FSB, 512 MB, Fx5200 128MB - CRT TV display

Similar speed. Both have separate HDD for OS and PVR data. Both record flawlessly and playback recorded video without an issue. However live TV is where they start behaving differently.

on #1 I can use live preview mode.
on #2 I cannot use live preview as it is VERY jerky.

So on #2 I use timeshift mode. Audio is flawless - video looks like it is dropping frame when the image moves quickly. Just enough to loose WAF points.

Question: What has a greater effect on live preview/timeshift - CPU, grahics, or other? Could re-scalling to TV out be the issue?


PS. Sub, Live preview is set on the 'misc' tab of the config utility, but the delay is controlled on the 'playback' tab. Should they be together - or is this to satisfy your sense of humour?

[sub]

PS. Sub, Live preview is set on the 'misc' tab of the config utility, but the delay is controlled on the 'playback' tab. Should they be together - or is this to satisfy your sense of humour?

The delay is only relevant when in timeshift mode, so it doesnt really make sense to relate them together. When you're in live preview mode, GB-PVR effectively hooks the output of the capture device to the input of the renderer with no additional buffering or delay added by GB-PVR.

[sub]

I have 2 machines running GBPVR.

#1 - P4 2.0GHz, 400FSB, 512 MB, MX440 64MB - monitor display
#2 - Cel 2.55GHz, 533FSB, 512 MB, Fx5200 128MB - CRT TV display

Similar speed. Both have separate HDD for OS and PVR data. Both record flawlessly and playback recorded video without an issue. However live TV is where they start behaving differently.

on #1 I can use live preview mode.
on #2 I cannot use live preview as it is VERY jerky.

So on #2 I use timeshift mode. Audio is flawless - video looks like it is dropping frame when the image moves quickly. Just enough to loose WAF points.

Question: What has a greater effect on live preview/timeshift - CPU, grahics, or other? Could re-scalling to TV out be the issue?

Its probably worth comparing the list of directshow filters from gbpvr.exe-native.log on both of the machines. This is most like to show the difference.

[wannabepvr]

Thanks - I will check them out when I get home.

[wannabepvr]

Filters are as follows:
(I did a lot of early try-out on machine 1 so it has all sorts or rubbush left over)

I get confused about MUXs, renderers, filters, demultiplexers etc. So I have zipped and attached the logs in case.

Machine #1.
[HTML]17:05:43.296 VERBOSE getSetting(ListGraphFilters)
17:05:43.296 VERBOSE Graph contains the following filters:
17:05:43.296 VERBOSE - CyberLink Audio Decoder
17:05:43.296 VERBOSE - InterVideo Video Decoder
17:05:43.296 VERBOSE - Default WaveOut Device
17:05:43.296 VERBOSE - Video Renderer
17:05:43.296 VERBOSE - BDA MPEG2 Transport Information Filter
17:05:43.296 VERBOSE - GB-PVR PSI Parser
17:05:43.296 VERBOSE - ffdshow Audio Decoder
17:05:43.296 VERBOSE - Elecard MPEG2 Video Decoder
17:05:43.296 VERBOSE - MPEG-2 Demultiplexer
17:05:43.296 VERBOSE - DTV-DVBT 878 Digital Capture Filter
17:05:43.296 VERBOSE - DTV-DVBT 878 Digital Tuner Filter
17:05:43.296 VERBOSE - Microsoft DVBT Network Provider
17:05:43.296 VERBOSE getSetting(SaveGraphFiles)[/HTML]

Machine #2.

[HTML]08:09:57.093 VERBOSE getSetting(ListGraphFilters)
08:09:57.093 VERBOSE Graph contains the following filters:
08:09:57.093 VERBOSE - Video Renderer
08:09:57.093 VERBOSE - Default WaveOut Device
08:09:57.093 VERBOSE - MPEG Audio Decoder
08:09:57.093 VERBOSE - InterVideo Video Decoder
08:09:57.093 VERBOSE - GB-PVR Parser
08:09:57.093 VERBOSE - SOURCE
08:09:57.093 VERBOSE getSetting(SaveGraphFiles)[/HTML]

[sub]

You probably want to compare logs when the two machines are trying to do the same thing, either both doing live preview or both doing timeshift. Instead your logs show one doing each, so its not easy to compare differences between the two. I hope you get my drift.

[wannabepvr]

ok, logical problem solving is it?

Attached are logs with both machines are set to live preview. Timeshift is also initiated towards the end after a few channel changes.

The live preview judder wasn't as bad as I remembered on machine #2. Although sync was really out.