imported mp4 showing as lines and not allowing poster frame
When importing an MP4 the frame no longer shows the first frame image, it shows diagonal blue lines. A poster frame can also no longer be set.
I've tried opening an old Indesign file that had an MP4 with a poster frame set and reimport the exact same MP4 next to it and it seems that the original MP4 works as expected, however the newly imported version of the same file doesn't show an image of the video and a poster frame cannot be set.
Please find an example screenshot of this uploaded, showing the original MP4 working as expected (on the right, imported before the current version of InDesign), and the same file imported in the same way showing only a box with diagonal lines and no ability to set a poster frame (on the left of the uploaded screenshot).
The version of InDesign is 21.0.
Luke
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