A circuit I designed uses the ADV7182 application circuit as set out in the datasheet.
I've noticed that on first power-up, the chip is very slow to achieve lock with any known good video signals - up to several minutes.
I've checked the clock frequency and tried driving it with multiple sources, but the problem persists.
Once the circuit has been running for a few minutes it locks to any video signal immediately, no problem: there's only an issue in the first few minutes after powering-up.
Enabling "fast lock" as described in the application note has no effect.
Any ideas on what would be causing this are greatly appreciated.