Opening h264 videostreams via http significantly delayed when "Realtime-Scans - Internet" is active

Hi, when opening a streaming h264 video on a website over http (does not occour via https!) we get this message:

When we disable "Realtime-Scanning" -> "Internet" the video plays fine.

Can anyone guide me on how to prevent the delayed playback/warning message for certain clients while leaving the realtime scanning on?

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[edited by: Qoosh at 10:45 PM (GMT -7) on 4 Jul 2022]