Question / Help Thin black lines on camera input in OBS

Prebstaroni

New Member
I recently had a livestream using a Sony Fs700 connected from its HDMI output via a blackmagic ultra studio mini then in to the Macs thunderbolt input.
Shortly after starting the livestream I noticed some thin black lines on top and in the middle of the screen in OBS (SEE PICTURES ATTACHED). They appeared and reappeared in a sporadic rythm.
When I tested the livestream two days before, I did not have the camera on a tripod a the testing went fine. No thin black lines.

The second day of livestreaming I changed the HDMI cabel but it didnt help much.

The footage in the camera was without the black lines so the problem must be somewhere else.
Any help or tips would be much appreciated.
 

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