The VideoLAN Forums

i have found our topics about using a multidesktop system to project one videofiles over 2 screens.. very interesting..

i am trying to setup up a videowall system using a 4 monitors (a,b,c,d)..
I want to show for example:
-with the first compu the top-half of the movie to monitor a and b
-the other compu to the under-half of the movie to monitor c and d

i am using:
compu 1:
pentium 2600
nvidia agp 64 mb , old 4 mb pci Sis , w2k
streaming mulicast
receiving multicast

compu 2:
pentium 2600
matrox g550 w2k
recieving multicast

I am going to explain...
I want to play one quarter of the video window fullscreen on one monitor , send an other quarter to the next monitor.. And send the other 2 quarters towards the next computer to do the same trick..

Network-wise everything is working perfectly !
Streamingwise everything is working perfectly !
After that , i have to possibilty's to show the video...
Possibilty 1:
use two vlc media players , cut out their quarters , and show them fullscreen...
Possibilty 2:
use one vlc media player , cut out one half , and show it using the wall filter...

Both ways give me problems...
Rescaling videowindows (especialy gdi) doesn't give me rescaled videoplayback..

How do i cut out a quarter or an half or , even better a fifth of the video ?
And how could i control that in a live situation (because when you would adjust your projectors in 1 min,you also have to move your quarter a little to the left or to the right)

Putting multiple videowindows fullscreen with a fullscreen-button for window a/b/c is not really supported..

DirectX doesn't show my video on the seconday cards..
GDi shows my video on the secondary cards , but it doesn't support rescaling..

And how are these problems with linux ?

Your program has huge potential in my working field..
http://www.lichtjes.nl
http://www.photonicvisuals.nl

Your problems are interesting but
seem to me very specialized.

I ma not involved in vlc development but I think it is too much to expect that somebody will develop solution as public project spending free time on it
for such specialized application.
Especially if the result will be used commercially.

We should cheer developers and appreciate their time and effort
meaning that they should be concentrated on mainstream problems.

Actually, this should be possible with VLC. It may even work on some platforms, on many it will not. The technology is in place, it just needs to be finished up, so it can actually be used. Problem is that this stuff is usually never finished because noone is actually in this particular situation. I suggest you find someone who has a bit of coding experience. Give him VLC and your actual setup, let him work on it for 2 days and I think you can get this running.
When you have enough processing power, i think the wall filter should work best. (though not when you split it in more than 4 displays i guess. would be a lot of GPU's

Oh, and the GDI output is slow and only a sort of test and fallback option. It's not really intended to be used. DirectX is the way to go.