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[Reely340]

Has anybody got an idea where the interference in the center of that video snapshot might originate from?

I'm amazed by the almost digital look of the bright/dim changes and the very sharp vertical boundary of the interference.

At app. 120 black/white changes per line, the frequency would be: 625 (PAL) x 25 fps x 120 = 1.875 MHz
given the vertical span of 1/10 of 576 visible lines the duration is 625/(576/10) x 1/25 = 3,5ms interference duration.

1.875MHz for 3.5ms, does that ring any bells?

The setup: test inside residential building,
distance 8 yards, one wall in between, signal quite strong
200mW, f=980MHz e.g. not inside Austrian 900MHz cell phone band (890-960)

[Mr.RC-Cam]

It is external interference of some kind. Could be anything: something located near or far from the flying location, or something you bring with you to the field.

Also, don't ignore any RF sources that are not on your exact frequency. Strong RF that has a frequency that is vastly different from your Rx's RF channel can still affect your system.

BTW, when it comes to recognizing noise issues, a high quality video recording is much more useful than a still photo.