[mythtv] Re: Whats wrong with myth

[Thomas M. Pluth]

Think latency.  The HD-2000 has a small FIFO and overruns occur quite
easily.

-----Original Message-----
From: Brad Templeton [mailto:brad+mydev at templetons.com] 
Sent: Sunday, March 20, 2005 3:53 PM
To: tpluth at surewest.net; Development of mythtv
Subject: Re: [mythtv] Re: Whats wrong with myth

On Sat, Mar 19, 2005 at 09:02:13PM -0800, Thomas M. Pluth wrote:
> Also, HDTV cards, because of the data rate involved, are very selective
> about the PCI chipset of the motherboard.  They seem to work best on Intel
> based boards (845, 865, 875 chipsets).   They are very sensitive to PCI
bus
> latency and loading.  I had trouble running multiple HD cards in one
server,
> because I also had numerous HDD controllers in that server as well.

This makes no sense.  The data rates of HDTV tuner cards are quite small,
in the range of 19 megabits, a fraction of what any ethernet card or
disk controller or many other cards do.   There is no reason for what you
describe.

Playing back hi-res video on the other hand does take a lot of data
movement,
about 500 megabytes/second, which is why only AGP cards (or pci express)
really
can cut it in that department.