Alles anzeigenI'm having similar problems with a little bit different configuration.
I have sk6812 led strip connected to a nodemcu esp8266 with wled, with Hyperion Ng on a Raspi3b+, with the same loop capture card. The raspi has its own PSU, the LEDs and the nodemcu have their own PSU. The nodemcu has connected the D4 pin plus a ground shared with the LEDs stripe.
The LEDs are showing correctly the colors of the image, but from time to time, randomly in time and in amount of times, the LEDs flicker on random colours, even if image is paused.
I've changed the capture card configuration from automatic to the configuration shown in the attached picture, but still flickering.
One note, it was working fine at first, then I disconnected everything and next time it had the annoying flickering effect.
Any help/recommendation?
In this YouTube video you can see the flickering from second 10
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For me, what worked was using the same power source for the Pi and the led strip (common ground) as its explained in this topic. Hope you can solve your problem!