Re: [Vnc2swf-users] VNC Timestamp to SWF FrameRate

[<lfk...@ya...>]

Hi,

First I would like to tell you that I'm not a developer of vnc2swf.  I'm just a
user trying to help the project.
Do you know anything about Flash or the swf file?
Well, the framerate tells how many changes per second you can have.  Movies for
cinema are recorded at 24 frames/sec.
Most Flash animations are built with 12 frames/sec (or close to it).  Usually
this gives smooth movements.
Unlike movies that have a still image on each frame, flash animations work with
objects on stage.  Think of them as actors.
You only have to tell when to place it on stage, when to move it around and
when to step it out.  No extra information is needed to keep an actor (object)
on stage.
So if you use 10 frames/sec then you can only make 10 changes on a second.
What happens to the changes in between?
The updates between frames are grouped and placed on the next frame.  This
means that if the mouse has moved 5 times between frames than the next frame
will show the mouse only at its last position. It's just as if the screen were
recorded at the framerate.  The only difference is that vnc2swf doesn't take a
screenshot everytime.  It register on the swf only the updates.

Luis Fernando




--- Kraus Blaise <ra...@ya...> escreveu:

> Hi,
>   thank you for the explantion. I did not understand the conversion of  the
> time stamps to the frame rate very well.  If I have for  example a frame rate
> of 10 fps and have olnly 2 Update with time stamps  120 ms and 760 ms within
> a second, how can I synchronise the timestamp  with the framerate?
>   
>   -The movement of the mouse pointers is very fast and one can get  sometimes
> within a second more than 35 update (messages) for the mouse  pointer.  How
> is it handled in VNC2SWF?  (assuming the  framerate is smaller than the
> number of Update)
>   
>   -Wich value can I give to the framerate if I record a Power-Point
> Presentation for instance?
>   - I also want to know how the mouse pointer is represented, as picture?
> rectangular area...?  
>   
>   I would look forward to an answer
> 
>   
> lfk...@ya... a écrit :  Hi,
> 
> The RFB protocol used by VNC is based on framebuffer update messages.  These
> messages basically contain rectangle areas from the remote screen that have
> changed.   
> Theses messages are sent uppon request and contain the areas that need to be
> updated since the last request.
> The SWF file is based on objects on the stage, frames and a framerate.  The
> objects are placed on the stage in a frame and stay on stage (showing) until
> they are removed in another frame.
> Pvnc2swf converts the RFB messages into rectangle objects on the stage in
> SWF.
> The framerate is used to sync the movie with the timestamp of the updates.
> This
> is done by adding the necessary empty frames (without new objects) on the swf
> file (time elapsed/framerate).  The objects are placed on the stage in a
> frame
> that represents that elapsed time.
> The objects on stage that are completely covered (by other objects) are also
> removed during an update.
> Hope it helps.
> 
> Luis Fernando
> 
> --- Kraus Blaise  escreveu:
> 
> >  Hello,
> >   
> >   VNC use timestamp for each message. I want to now how this timestamp  and
> > Message are adapt to SWF-Frame and the fix SWF-framerate.
> >   
> >   Thank u.
> >   
> >   Regard
> >   
> >   Ranrul
> >   
> > 
> >   
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> 
>  
> 
> 
> 
>  
>   
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