Video/sound sync problem

Occasional Visitor
Hi everyone,

It's my first time posting here so I hope I'm doing it correctly :)

I had trouble today during a live event. As soon as we started it we experienced a video/sound sync problem with up to 4s offset. Signal is sent via an extron smp350 encoder.

I doubt that the problem is from the encoder because the rec is absolutely fine.

Perhaps you have an idea?

Many thanks for your help,
Tom
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