[Bug] Unable to preview VHS video (gif can be previewed normally)

[huchenlei]

          ### Unable to preview video (gif can be previewed normally)

The video URL is correct and can be played effectively,

but in the sidebar, it says "Video failed to load"

Originally posted by @mijuku233 in #1174 (comment)

[huchenlei]

Hmmm, probably need a mapping from all VHS format strings to HTML video type format strings.