I have built a 24 input to 4 output video matrix for a tv studio. The 
input signals come from 24 IP to video complex transcoders which 
receive their stream from remote cameras spread around the town. The 
cost to put 24 frame synchronizers  is huge so I figured out if I can 
synchronize the video outputs of the IP transducers will allow for 
the same effect with less money. The IP transducers are small and I 
will mount them in a 2U rack case so they are close together.
I have opened one and the video output IC is a VT1622A digital TV 
encoder. So far so good but I cannot find the datasheet for this IC. 
I have found the datasheet for the VT1621 and this accepts an 
external VSync signal to lock to, so this would be superb.
  So my first question is: does anyone has the datasheet for the VT1622 chip?
  If not, what do you think of this: If i remove the local 
oscillators for the VT1622 chips and feed all of them from one single 
oscillator and I reset all the transducers at the same time, is there 
a chance to have them in sync from that point on?

Thank you,

Mircea Chiricuc

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