last　frame

Extract the last frame of the video。 There is probably a maximum value for video loading。 if it fails 「skip first frames」Please raise 。
if it's a 5 second video using SeaArtUltra, I think it would be lighter if you skip 100 、 10 seconds 250 or so 。
The video may be too large to load. Try skipping first frames by 100 for a 5 second video, or 250 for a 10 second video .