Re: HDTV motion glitches

From: JW (anonymous_at_Nospam.Iam)
Date: 02/27/05 

Date: Sun, 27 Feb 2005 13:53:18 -0800

The raid ) configuration may actually be slowing you down especially if the
drives are off of the same bus. With the big buffers in today's disk drives
Raid 0 is often not a benefit at all since the data always has to be synched
up between the drives instead of just being pulled from the buffers which
normally try to read ahead and anticipate the next request.
More likely, however, is the fact that NVIDIA has yet to release a fully
supported PureVideo driver for the 6xxx cards. The latest beta driver at
Guru3d.com is 75.90 but there are no release notes to say what improvements
it has over the 67.66 Beta drivers on the NVIDIA Web site.
I expect that the final released drivers will provide better use of the
decoding hardware acceleration capabilities of the different 6xxx chips than
the 67.66 drivers do.

"Doug" <Doug@discussions.microsoft.com> wrote in message
news:523F7559-ECC6-4695-8757-2D7EB09D4513@microsoft.com...
> I'm seeing problems with brief glitches in programs with certain types of
> motion in MCE 2005. This is particularly noticeable on standard
> definition
> programming broadcast via HDTV like local news. In flipping channels, I
> found "Wheel of Fortune" on our local CBS station at 1080i to be an
> excellent
> test case. Periodically the wheel will freeze for just a brief moment.
> Same
> with Vanna walking in front of the letters. This does NOT happen if the
> same
> stream is played back via Media Player.
>
> The system is an Athlon 64 2800+, 1GB RAM, GeForce 6200, NVIDIA DVD
> decoder,
> ATI HDTV Wonder, 200GB system drive, 2x160GB SATA striped RAID capture
> drives. All the latest drivers as of last week. CPU usage is at 40-50%
> during 1080i playback with nothing else running and no spikes according to
> task manager or perfmon. Monitor resolution doesn't matter but I'm
> currently
> at 1600x1200 on a CRT. A benchmarking program will read the stream file
> at
> an average rate of over 90MB/sec. I removed 1 of 3 DIMMs to increase the
> memory bandwidth by ~40% on this socket 754 motherboard but that didn't
> help.
> I can't find any reason why MCE shouldn't be able to play back smoothly,
> especially since Media Player can do it.
>
> I also wrote a little program to read the stream in advance of Media
> Center
> as it's playing in an attempt to get it loaded into the cache before it's
> needed. Media Center appears to be bypassing the XP disk cache so that
> didn't do anything useful.
>
> Has anyone else seen this and perhaps been able to resolve it? I think
> there's a defect in the Media Center buffering implementation. The abuse
> the drives undergo while simulataneously recording and playing also
> indicate
> something not so smart may be going on.

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