Video still not quite up to par
jim at winonacotter.org
Thu Jul 19 15:01:10 BST 2007
> I have run full screen video across LTSP5 on feisty using ssh forwarding
> with minimal skipping. Just in case, I presume the problem is still
> present when you turn off LDM_DIRECTX?
Yes, with LDM_DIRECTX=True commented out, my video gets worse. The bypassing of ssh for
video does add improvement, but it is still not as good as with LTSP 4.2 under K12LTSP6.
> It may have something to do with your video card setup. I don't know much
> about this stuff but I think for example that the Xv extension is important
> for video playback. It's possible X is not being configured optimally on
> that client. Do you have thin clients with different hardware and if so,
> do you see it on all of them?
> If you install gxine, on first run it gives a wizard which shows you ways
> to improve video performances (such as Xv).
I was wondering the same thing yesterday. I started messing with video settings in
lts.conf to see if there was any improvement. At this point I am only testing with a
Term150 from Disklessworkstations.com. I am out of town now until Monday but maybe I
will try some other workstations to see if there is any difference. I will also give
the gxine test a shot.
> Not really with feisty in my experience. Although, if a lot of people
> started running full-screen video I can imagine things might start to go
> bad. That's a fundamental issue with sending rendered video across the
> network though. I presume you have a GigE switch at least for the server.
The server has 6 Gig NICs teamed with adaptive load balancing ran into a Gigabit switch
in my Cisco 4006 router. Then another GBIC blade runs a separate gigabit connection to
each wire room feeding no more than 20 clients per Gig uplink. I am certain the network
isn't the problem :-)
> > I would like to try some modifications before testing both the
> > K12LTSP-5.0.0EL 64-bit and 32-bit with PAE. Any suggestions would be
> > appreciated.
I will play around with the video settings next week. There is just too much to be
gained in my opinion by using Edubuntu and LTSP 5 (the future of LTSP) to go back to the
old methods. I don't really care if the students can play youtube videos full screen,
but I want to be certain apps like KStars run smoothly and that editing a text document
that spans more than one page isn't a problem (If I try and highlight text that requires
scrolling up or down in a document, the scrolling is very jerky). I am just fine with
stating that other types of videos simply need to be shrunk down, after all most video
content on the internet gets very pixelated at larger resolutions anyhow.
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