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134 posts

Master Geek

Topic # 30801 21-Feb-2009 20:27
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TV3 stutters every 5 seconds or so. Cpu usage is 15-20 so I think hardware acceleration is working fine and all the other channels are silky smooth.

My graphics card is an 8800gt 512mb and I am using the PowerDVD 8 codecs. I am on Windows XP.

Anyone know why this is happening?

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30 posts


  Reply # 200496 10-Mar-2009 22:31
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Sounds like you have ruled everything but reception quality out.

Use a program like ScanChannelsDBA_UK.exe to find out what your signal strength is like. Possibly its borderline enough that C4 (and the other channels) are fine but TV3 is stuttery. Its worth looking into, I know I had to mess around with some antenna problems before I got total smoothness on all channels.

490 posts

Ultimate Geek
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  Reply # 200533 11-Mar-2009 09:11
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Signal quality (as suggested by Kelpi) is a good place to start.

If it's not that, then have a play with the timeshifting properties. I adjusted mine away from the defaults because I noticed every couple of minutes some stuttering. Found that more smaller timeshifting files worked better for me. I now only have very rare occasions where I get stuttering/pixelation which is often weather related (I'm on the edge of DVB-T reception range in Auckland).

From memory the defaults were a minimum of 6 files at 256MB each. I changed this to something like 32 files at 64MB each. I have also moved my timeshifting to a separate partition (after a rebuild) to reduce file fragmentation. It may not reduce fragmentation of the timeshifting files, but it does help elsewhere (e.g. recorded TV, videos, music etc).

Other than that, about the only other thing I can think of is possibly video drivers - but then the nVidia ones have always performed well. Maybe play around with EVR enabled/disabled too.

Just rereading your post (to check I hadn't missed anything) you mentioned that CPU usage is 15-20%...but you don't mention what your CPU is.  On a low end CPU that'd suggest hardware accelleration is on, a high end CPU it might not be.  As a comparison my HTPC has a AMD X2 3600 and I get around 15% with hardware accelleration on and watching HD tv.


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Uber Geek
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  Reply # 200982 13-Mar-2009 11:52
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Drop the display res and see if it stops - did for me on the piece of crap ATI card I have in the machine with a DVB card in it.


134 posts

Master Geek

  Reply # 201063 13-Mar-2009 16:25
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My CPU is a Core 2 Duo E6300 at around 2.4ghz.

It seems the stuttering has gone away of its own accord. Not sure what the issue was. Probably worth noting that my CPU now hovers around 8%.

But now (seemingly since updating to 1.0) all sound has gone on every channel! There's sound in other windows apps and I can hear those 'tings' when you move the cursor in mediaportal, and when I record something in Mediaportal and play it back there's sound... Could be a codec issue?

I'll probably make another thread about it unless I get an answer here.

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