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M
@Mlipka No, it's not enabled:
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Opera's autoplay policy may mute background MP4 videos. Try adding user interaction elements to play sound or check your video tag for a "muted" attribute. If that doesn't work, consider re-encoding the video file.
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Wie wäre es mit einem Beispiels-Link? dann könnte man das zumindest eingrenzen.
Hier noch einige Anregungen, zwar für ältere Version (das mit den Plugins geht nicht mehr), aber vielleicht trifft ja etwas zu:
https://praxistipps.chip.de/opera-spielt-keine-videos-ab-daran-kanns-liegen_51677
Topic closed as solved. If in up until to a month the author needs the thread to be reopened, just report it. briefly explaining the reason.