pro---studio wrote:Hello Kasper,
thanky for your reply.
But I think you misunderstood me. I don't want to know how fast the videohub will switch.
I want to know if there is any difference in timing regarding the input and the output of the videohub. I mean: will the latency increase when I connect a camera to a videohub and then the videohub to the ATEM switcher?
The ATEM switcher has 1 frame of latency from input to output (if you don't use any DVE). Will that be increased if I use a videohub in front of the ATEM?
Especially for IMAG use you need a low latency setup and any additional frame will mess up your system.
Could you answer that please?
Thank you!
pro
You are asking about he propagation delay throughout the router, so in a switcher like the atem, signals are frame sync'ed therefore a delay occurs, from input to output, as the cust. rep explained in a router they are not frame sync'ed they are switched at the top of the reference frame, this is only while switching. I haven't seen BM publish their system propagation delay, but Ross NK routers which are a Codan product, (australian), very similar architecture , you have a 50ns propagation delay. A typical crosspoint switch FPGA will have a 7ns delay. So once the switch is made and the input to output relationship is established, the delay is no more than a distribution amplifier would be.
An easy enough test would be to use the super out of a deck, run one copy to your atem, and one to the videohub then route to the atem, record the multiview output and compare the timecode burn, on the 2 windows, you can even run the output to the videohub to an input to an output to an input looping it in itself several times and you still wouldnt see the frame difference.