Q. re broadcast synch clocks

[Michel Bardiaux]

In a long run of my capture application, I see, at random moments but on 
average roughly once per houre, either 2 or zero frames in one 40msec 
interval (PAL, 25fps).

This could be due to fluctuations in my system clock (it is NTP'ed but 
nothing is perfect), or in the TV board, or just bad signal from the 
cable company, but I wonder: what is the stability and long-term 
accuracy of the 50Hz synch clock in a broadcast TV signal? Anyone know 
where I can find such information?

--
Michel Bardiaux
Peaktime Belgium S.A.  Bd. du Souverain, 191  B-1160 Bruxelles
Tel : +32 2 790.29.41
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