robere2
commented
1 year ago I think I'd need to see a live example of this, however this could perhaps be solved via the SDI ref/genlock connections. Without a reference, each piece of equipment that your video signal goes through needs to wait up to 1 frame to receive the entire frame's signal from the device before it. If a video signal is going through 10 pieces of equipment before you're injecting the audio signal, the video could be 10 frames behind in the worst-case scenario.
To take advantage of the ref/genlock port, you need a sync generator (cheap one here) which sends a signal to all of the equipment which you want synced. This includes cameras, the switcher, video router, DAs, graphics computer, etc.
My experience and knowledge here is limited, so I am not sure if this is the only problem here, however it's probably at least contributing to the issue. 0.5 seconds sounds like a lot for this to be the sole problem.
During hockey, the time it takes for a video feed to go from the camera through the cables and though the routers and switches to a program out feed it takes around half a second. This means the program out has realtime audio and scoreboard sync but the video is half a second behind.
This is not supercritical except for at the end of the period where a goal may have went in within the last few seconds of play. It may give the view the wrong impression that it was in fact a goal when in reality it was no goal.
One possible solution would be to make an option to toggle just the clock off from the scoreboard. Alternatively, add a controllable delay to the incoming time packets.