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| Poor Video Quality http://forums.linhes.org/viewtopic.php?f=1&t=112 |
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| Author: | gumby [ Thu Nov 13, 2003 2:43 am ] |
| Post subject: | Poor Video Quality |
I have jsut settup knoppmyth for the first time and it went pretty much without a hitch. I have a problem however with the video quality that is being output. I have tried this with both an ATI Remote Wonder VE as well as an older Hauppauge WinTV Go. When watching live tv the video quality is very jumpy/choppy and grainy. The picture of a recorded show is quite a bit less jumpy however the picture is still grainy and horizontal lines appear when there is a fast action on the screen. Has anyone else experienced this or does anyone have a solution? I know my hard drive may be a culprit here as I just set knoppmyth on a 6GB 5400 ATA33 drive. I have checked and DMA is enabled on both the motherboard and the drive itself. My CPU is an Athlon Xp 1700+ and I have 512mb PC2700 DDR. Its not the speediest machine but in windows it works great in every PVR application I have tried (Including SnapstreamPVS which is a great windows alternative providing you are willing to pay for it) If anyone else can lend a hand as to why my video might be the way it is it would be of great help. Thx in advance Gumby |
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| Author: | Xsecrets [ Thu Nov 13, 2003 9:23 am ] |
| Post subject: | |
I don't know how fast the hard drive has to be, but I would think that even a ATA33 drive that is using dma properly should be able to run one stream. and I know the computer is fast enough. I am running a athlonxp 1700+ with ddr2100 ram and I can record two streams and play another one back. granted I do have one pvr250 hardware card. for the jerky video I would double check that the harddrive is using dma and 32bit disk acces. at a root prompt type Code: hdparm -c -d /dev/hda
hda is standard ide drive on primary master anything else and you have to change the line appropriately. As for the horizontal lines when there is action in mythtv go to setup->tv->playback and make sure deinterlace playback and jitter reduction are both on. |
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| Author: | tomservo [ Thu Jan 22, 2004 2:43 pm ] |
| Post subject: | |
One thing to try is setting DefaultDepth = 24 in your XFree86-4 file. Mine was on 16 bit and look horrid. |
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| Author: | cesman [ Thu Jan 22, 2004 6:09 pm ] |
| Post subject: | |
You may need to speciify card and tuner type. |
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| Author: | freddyman [ Sat Feb 28, 2004 6:05 pm ] |
| Post subject: | horizontal lines durning fast action |
I know this is an old thread, but hunted it down because I had the same probelm with the horizontal lines when watching on my tv. I've got jitter reduction on, but the deinterlace is unchecked. My X11 settings use 24 bit. Just for a try, I turned checked deinterlace even thought I am using a tv. No change. I'm using a pvr-350 with a 352X480 res at 5500/8000 just to rule out bitrate problems. /var/log/messages and /var/log/mythtv/ have no errors in them. Any ideas? Cesman, as for the card and tuner type specs you are talking about, are you talking about setup in X11? I've got settings for ntsc, and spec the nvidia card in X11. |
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| Author: | cesman [ Sat Feb 28, 2004 6:15 pm ] |
| Post subject: | |
I'm referring to the TV tuner. |
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| Author: | freddyman [ Sat Feb 28, 2004 6:54 pm ] |
| Post subject: | where do you specify the tuner? |
You mean specify the tuner in XF86Config-4 or where? |
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| Author: | Xsecrets [ Sat Feb 28, 2004 7:51 pm ] |
| Post subject: | |
that really only pertains to the bttv cards not to a pvr250/350, so you should be fine on the tuner settings. |
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