Re: [Vnc2swf-users] Project Future

[Reid E. <ra...@tn...>]

Well as mentioned before, we should be recording some sort of  
compressed (gzip?) vnc stream, and then converting the data  
afterwards. Actually, we could spawn a second thread that just  
converts the data stream to whatever format the user has selected. In  
this day of multi-core CPUs, this surely makes sense.

Reid

On Apr 16, 2009, at 19:15, Yusuke Shinyama wrote:
> Hi,
>
> To create a speed-efficient recorder, we really need faster byte  
> operations.
> Probably the most expensive part in the current pyvnc2swf  
> implementation is
> just to convert the whole bitmap into another format.
>
> More specifically, look at line 61 in image.py:
>
> def create_image_from_string_argb(w, h, data):
>  data = ''.join([ data[i+1]+data[i+2]+data[i+3]+data[i] for i in  
> xrange(0, len(data), 4) ])
>  return pygame.image.fromstring(data, (w, h), 'RGBA')
>
> Now imagine a VNC server sends you a 1600x1200 bitmap (7.6MBytes)
> That's a lot of data for doing this kind of operation for each frame.
>
> For some time I was thinking of writing some external functions in  
> C, which
> would be hundred times faster to do this kinda stuff. But it breaks
> the beauty of platform-independentness.  This is the point where I  
> was stuck.
> People would need to install a C compiler to build pyvnc2swf.
> Perhaps it's not a big problem in Linux or *BSD, but I was afraid it  
> brings
> some extra trouble. I certainly expect complaints from Windows/Mac  
> folks.
>
> So... how do you guys think? Maybe I should ask people what kind
> of platform they are using. If cross-platform is not a concern, I
> think this is the way to go.
>
> Yusuke
>
>
> On Thu, 16 Apr 2009 22:33:16 +0200 (CEST), Olivier Hervieu <oli...@wa... 
> > wrote:
>> Great,
>>
>> TheAmigo, i think that our needs are the same ... we have to record  
>> several (more than 2!!) vnc session on the same computer...
>>
>> your idea to write a ffmeg plugin is great that might interressed  
>> people who wants to have an authoring/transcoding tool shipped with  
>> pyvnc2swf.
>>
>> So for the next week i propose that everybody interressed in the  
>> project of a safe and fast vncrecorder to send on this mailing list  
>> what should and shouldn't be the the vncrecorder.
>>
>> I propose the same for people who are interressed in an authoring  
>> tool to send here what should be this vncauthoringtool.