What type video are you switching - Composite, Component, DVI ? Google 
for crosspoint switches. I have a similar problem, with either Component 
or DVI. 4 inputs and 4 outputs. Have been looking for a way to use cat-5 
cable, or something inexpensive. Main stumbling block has  been matching 
impedance of items. Typical cable length would be under 50 feet. I was 
going to start a thread on sublect in near future, trying to clear the 
deck first. :)

Electron wrote:
> Hi!
> I'm at component identification phase without satisfactory success so far
> for an IC that could multiplex from at least 3 video composite sources,
> without noticeable loss of quality, and that (even better) could either
> tell my microcontroller which of its inputs are active (i.e. video signal
> is valid) or automatically switch back (following a priority, e.g. channel
> 0 has the highest priority) to the lower priority channel in case the video
> signal on the selected input is absent.
>
> In short what I want to do is to freely switch at least 3 input video sources,
> but since I will be recording without any visual feedback of what's being
> recorded, and the sources could fail, then I want to make sure that I am
> recording something anyway (so I thought that another possible way could be
> to check just the output of the multiplexer for "video good" signal, and act
> on the multiplexer accordingly).
>
> If no chip exists can can do that, could you please at least suggest a good
> composite video multiplexer (possibly from TI catalog)?
>
> Thanks a lot,
> Mario
>
>   
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