Video cannot be played when the folder name begins with '#'

[n1lsB]

Expected behaviour

Video should start to play as usual.

Actual behaviour

The video player crashes, probably because it does not correctly encode the '#' when calling the webdav/remote.php api. The server responds '503 Service Unavailable'.

Steps to reproduce

1. Create a video inside a folder that has a '#' at the beginning of its name. (like #Test)
2. Try to play that video.

Tested on nextcloud 19.0.4 with video player 1.8.0. I have also reproduced this behaviour on try.nextcloud.com
Tested with Firefox 81.0.

[fechnert]

I can reproduce this issue with nextcloud 20.0.7 and video player app version 1.9.0

[tgressly]

Same when the # character is anywhere in the filename.