On Fri, 4 May 2012 12:16:42 +0200 (CEST)
"Florian Kemmer (florian.kem...@hs-furtwangen.de)"
<florian.kem...@hs-furtwangen.de> wrote:

> What is the intended behavior here and/or how do I get the number of FPS that
> are seen in VNC? If possible at all.

There is no such thing as frames per second in VNC. Actually, there is no such
thing as a frame in the RFB protocol: it actually deals with damage regions
which may be (much) smaller than the full frame.

Also, even if you actually had a number of frames per second, it wouldn't be
enough to say that a solution is better than another. You have latency to take
into account, as well as image quality.

As a result you are trying to measure the following values:

- FPS - doesn't exist in RFB but you have updates per second
- latency - nearly impossible to measure
- image quality - there is no objective measurement representing the
  degradation felt by the user

while what you really want is to estimate:

- overall user experience

The latter is a function of the former, but it's in the brain of each user, and
it's different (some users care more about quality than latency, and so on).

This explains why I claim that benchmarking remote visualization solutions is a
lost cause. The most efficient way is to make people actually use it and ask
for their opinion.

For what it's worth, there are some things that you can benchmark - for example
the required bandwidth at a given perceived image quality. But it's not going
to be an objective measurement.



-- 
Greetings, 
A. Huillet

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