The problem is that rdp and ica are not designed for synchronized audio
and video.
They are designed for low bandwidth usage. Especially ica.
We noticed these problems 6 years ago and even with the biggest muscle
at that time it was not possible to get synchronization within the 100
millisecond range.
So basically this means Sun Ray with ica or rdp are useless in Primary
K12 education. Why?
There are two types of applications which are used quite often.
The first is reading text while highlighting the words on the screen. If
reading is done 4 seconds later than the highlighting it is not very
useful. The second is game oriented applications. They require fast
feedback on mouse movements and also audio feedback.
So since I am a Sun Ray fan we decided to opt for a better solution than
rdp or ica.
We started a project with Mark Silzer (Sun corp.), Manuel Jaffrin (Sun
EMEA), Jose Ling (Sun Netherlands), Leonardo Reiter (Win4lin), Mark
Hinkle (Win4lin) and myself to design and build a better audio and video
solution for running Windows on Sun Ray. After one year of development
we release the nnaudio subsystem for Win4lin. This is a highly optimized
audio subsystem which is specially designed for Sun Ray in a high
bandwidth environment. In order to achieve this Leonardo really used
every trick in the book. Nnaudio has become part of Win4lin terminal
server some years ago. It is still the best synchronization of audio and
video around and it shows it is possible if the design is right.
It is also in production on over 1200 Sun Rays in primary education in
The Netherlands and is serving more than 12.000 users at this time. You
can find the case study at the Sun website:
http://www.sun.com/products-n-solutions/edu/success/pdf/siceroo.pdf
(I moved to raywyse so I am no longer CEO of Siceroo.)
Kind regards,
Ivar
Craig Bender wrote:
This is also one those things where muscle matters. You'll get better
performance the faster your Sun Ray server. You'd see a big
improvement using an Opteron based server. Flash itself is also not
the most efficient thing, so you might even get better performance
under realplayer.
Kevin Burtch wrote:
I just switched over the policy to allow a local JDS Sun Ray login
and tested.
The performance is drastically worse, but the sync is near perfect.
RDP = fairly smooth video + audio lagging 3-4 seconds
JDS = very choppy video (maybe as good as 2 frames/second) + tightly
synced audio.
I'm really surprised at how bad the frame-rate is being the only user
on an idle T1000. I must be missing some tweaks (stock /etc/system
file).
In case you're curious, I just went to youtube, searched for "daily
show", and clicked on "UCONN Daily Show" (just because it's a really
easy one to find with close-up of people talking so you can see the
sync, and it's what I tried on the windows side before).
I haven't tried building anything to play mpegs yet... not sure I'll
have time.
Regards,
Kevin
On 12/6/06, Sangeeta Varma <[EMAIL PROTECTED]> wrote:
Kevin,
Do you see the same issue when you run the same video on a Sun Ray
server without using connector or rdesktop (ie. no windows involved) ?
-Sangeeta
Kevin Burtch wrote:
>
> We are seeing about a 4-second delay in audio output on Sun Ray DTUs
> coming from any Windows system via RDP.
> We've tried with both the current version of the Connector and
rdesktop,
> both have the exact same symptoms so it appears to be an SRSS
problem,
> not a Connector problem.
>
> Playing any video (no matter how small), whether it's mpeg, flash
based,
> etc. - the audio starts 4 seconds after the video, and stops 4
seconds
> after the video - even if the application is closed... it keeps
playing
> for 4 seconds.
> We see this with zero load on the servers, only one person using
one DTU.
>
> I'm told that even playing an audio file has the same effect... the
> scrollbar slides for a while before the audio starts.
>
> It appears the Sun Ray Server software is performing way too much
> buffering of the audio.
> Has anyone else had this experience?
>
> FYI:
> SRSS 3.1 + 120879-05
> T1000 running Solaris 10 1/06
>
>
> For what it's worth, I've seen this work several years ago when I
set up
> a classroom for a local charter school... 30 users on a V210 with no
> sync problems using rdesktop ( 1.2 I think).
>
> Thanks,
> Kevin
>
>
>
>
>
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>
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