[mythtv-users] Video input problems

Jonathan Keane jkeane at gmail.com
Wed Jan 16 22:19:28 UTC 2008

I've setup MythTV (for the first time) on an Intel Core 2 Duo 6300  
(1.86GHz) system with a pcHDTV HD-5500 card in it. It's hooked up  
directly to my cable provider, and I receive the standard analog  
channels as well as a handful of digital, HD channels. The location of  
Myth's recording directory is a pair of SATA drives in a RAID 0  

MythTV is setup and is in general working, but on at least the analog  
channels (I haven't tested the digital channels as much) I get video  
tearing very often. In investigating it I am pretty sure it's a  
problem with the capture. When I record a show it will always tear in  
the same location time and time again on both the frontend/backend  
server and a remote frontend. I also exported the recording using  
nuvexport (under very light system strain), and the resulting file  
tears in the exact same location as well. It's possible this is a  
display issue across both computers, and the exported file - but it  
doesn't seem likely.

  I have attempted to change the bit rate on the audio in an attempt  
to lower the amount of data coming out of the capture card, with no  
success. I attempted to mess with the pci latency (http://www.mythtv.org/wiki/index.php/PCI_Latency 
) but it appears that the bus the hard drives are on is PCIe. I  
attempted to turn on DMA with hdparm and both hard drives seem to not  
accept it (I've found conflicting reports about SATA drives and DMA  
with google).

I can't think of anything else to do. I'm going to try to build myth  
from source maybe this weekend to see if that possibly improves the  
performance. Does anyone have any ideas what this could be?


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