X, Network transparency and ssh

[Lennart Sorensen]

On Fri, Jan 13, 2006 at 08:07:57PM +0200, Peter wrote:
> This is a hardware issue. The way direct X11 (aka overlay - hehe) works 
> with xawtv is, the RISC cpu in the tv capture card is programmed to 
> write data directly into the screen buffer, using the PCI bus. The CPU 
> is not involved. That's why it's fast. For obvious reasons, you can't do 
> this over the network.
> 
> X11 is not fast enough for live video at 50fps and full screen with 
> substandard hardware (like I and many others use - i.e. sub 1G cpus), 
> but the real bottleneck is the network. Do some calculations, yourself. 
> 16bpp with 750x350x50fps*2bytes/pixel = 26Mbytes/sec or twice as fast as 
> the maximum throughput of 100MBps network, run peer to peer under 
> optimal conditions.
> 
> If you run a live encoder and watch the resulting ogg or avi or mpeg 
> through the network with xine, f.ex., then you have better chances to 
> make this work.

Hence why I suggested VLC.  VideoLan is what you want for something like
that.  Fast encoder and fast decoder.  And the decoder running on the
client can write directly to the X display's memory.

Len Sorensen
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