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Choppy video
PostPosted: Tue May 01, 2007 6:58 pm Reply with quote
64mgb
 
Joined: 01 May 2007
Posts: 5
Location: Iowa




I have an HD-5500 installed in my Ubuntu (Edgy) test box, running 2.6.19.3 kernel, in MythTV (0.20), 512 MB RAM, 160GB SATA drive, 2.93GHz Celeron processor. I finally got things set up so I can receive the HD channels off my cable, as well as some of the over the air channels. But the video is VERY choppy...even when playing back a recording. Any ideas what I can try to change this?

Also, I can't get any of the NTSC channels...there is no device in /dev and in Myth it says something like "Failed to open card". What could be wrong there?

Thanks,
Rich
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PostPosted: Tue May 01, 2007 7:32 pm Reply with quote
waterhead
 
Joined: 24 Apr 2005
Posts: 299




Is the CPU at 100% when the video is choppy? HD video can put quite a load on the processor.

You don't say what type of video card you have. You may need to pass off the video proceessing to a video card. I use a nVidia 6600GT.

As for MythTV, I don't know why there is no /dev/video, but you can't change anything while the backend is running.

_________________
Mythbuntu 8.04
Intel D875PBZ main board
Pentium4 3.06Ghz
1024GB RAM
nVidia 6600GT
pcHDTV HD-3000
Air2PC PCI
MythTV 0.21
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PostPosted: Wed May 02, 2007 5:20 am Reply with quote
64mgb
 
Joined: 01 May 2007
Posts: 5
Location: Iowa




waterhead wrote:
Is the CPU at 100% when the video is choppy? HD video can put quite a load on the processor.

You don't say what type of video card you have. You may need to pass off the video proceessing to a video card. I use a nVidia 6600GT.

As for MythTV, I don't know why there is no /dev/video, but you can't change anything while the backend is running.

I'll check the cpu usage tonight. As for the video card, I think this pc is using the onboard Via driver for video. It works fine for analog TV using my Diamond PVR-560 card, but maybe it isn't good enough for HD.

Rich
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PostPosted: Wed May 02, 2007 2:23 pm Reply with quote
waterhead
 
Joined: 24 Apr 2005
Posts: 299




On board video usually cannot handle HDTV. My nVidia card wasn't doing the job using the drivers that are native in Fedora and SuSE. It wasn't until I installed the Linux driver from nVidia that I started to see improvement.

nVidia seems to have some pretty good support for Linux. But, not all of their drivers will work properly. Sometimes they fix one thing and wreck another. A while back, I had a pretty good system using the 7676 driver. I decided to upgrade the kernel, only to find the driver would not compile in the new kernel. The newer drivers that did compile sucked!

They finally straightened things out, but I could not watch any HD content for a while, until they did.

_________________
Mythbuntu 8.04
Intel D875PBZ main board
Pentium4 3.06Ghz
1024GB RAM
nVidia 6600GT
pcHDTV HD-3000
Air2PC PCI
MythTV 0.21
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PostPosted: Wed May 02, 2007 7:01 pm Reply with quote
64mgb
 
Joined: 01 May 2007
Posts: 5
Location: Iowa




Yea, it looks like the CPU is pretty much pegged while watching HD. Anything I can do about it?

Rich
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PostPosted: Wed May 02, 2007 10:37 pm Reply with quote
waterhead
 
Joined: 24 Apr 2005
Posts: 299




You would have to add a video card to handle the video. My card is 128MB, and you can get 256MB cards.

This is assuming that you have a slot to put a card into.

_________________
Mythbuntu 8.04
Intel D875PBZ main board
Pentium4 3.06Ghz
1024GB RAM
nVidia 6600GT
pcHDTV HD-3000
Air2PC PCI
MythTV 0.21
View user's profile Send private message
Choppy video
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