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When creating an animation and rendering it afterwards as a FFmmpeg video with MPEG-4 as container and H.264 as video codec, I get a black thumbnail/poster frame. For example, after uploading to a website as slack.com. Examining the file with ExifTool reveals that the Quicktime tag Postertime is set to 0s.

Is it possible to set a posterframe or to change the postertime setting?

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