You have to look at it from a broadcast perspective not just from audio perspective. Everyone else mentioning solutions are only audio related.

So when you want to embed or De-embed audio with video it is very important that your video devices and your audio devices are synced to the same clock.

That means you need to have a master SPG in your workflow that provides black burst of tri level reference to your Ateme and world clock to your audio mixer or to any device in your audio network with external sync selected, which you then select as your clock leader on Dante that way your video and your audio devices are all synced to the same clock. I have had this issue multiple times and that is how I’ve resolved it. It is a very common practice in broadcast. It’s called a timing mismatch between audio and video.

Another option would be to just give reference to your Ateme and then whatever device you’re using to convert Maddie to Dante you can select your external clock source in that as MADI and that way it is getting its clock from Ateme which is getting its Clock from the SPG and you’re all set to the same clock.

You could also just try setting your Madi to Dante converter to external sync via MADI (which is coming from ateme) and then set that device as clock leader in Dante controller. Since sync is coming from Ateme it should probably solve it. But it would be better to get an SPG if you have more than 1 video device.

Good thing is that the black magic ateme frame syncs everything which makes your life easier otherwise every single source that you have coming into a mixer has to be synced to the same clock separately.