Black bar at the top of video in
UNA13-B2
While the page is loading and the "Play Button" is still Grey the video is formatted perfectly in the window. (more below image)
**** Pasting an image into a post REPLACES the HEADER IMAGE 
As soon as the play controls appear than the "Play Button" turns blue, a black frame gets added to the TOP, LEFT and RIGHT of the Video.
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This happens in "VIEW-VIDEO"
https://una.io/view-video/-test-video
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@LeonidS @Alex T⚜️ @Andrey Yasko
There is still a black bar across the top of the video on the "View-Video" page. The BLACK bar appears when the player controls activate.
UNA 13-b4 (Protean and Artificer)
@MSolutions this appears to be an UNA problem, not related to your water mark.
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Thank you for the report - https://github.com/unaio/una/issues/4133