The file that I tried to publish was indeed corrupt. Another video was published just fine.

I only received the following error:

Apr 03 11:26:38 [13] /image_transcoder.php?o=bx_persons_gallery&h=208209&dpx=2&t=1743679594 [bx_persons_gallery] ERROR: storeFileLocally_Storage failed, file(208209) wasn't found in source storage (bx_persons_pictures)