Broken Gallery in Documentation

[COLABORATI]

The Gallery page in the docs does not show soem videos, instead it triggers the browser to as to download multiple files, with then can not be downloaded because of a network error. I assume some mime type related webserver configuration error.

[levimatheri]

It seems that the rel=0 parameter for youtube url's are being updated or are simply no longer in use. That seems to be the problem: Check out the page source code: http://zulko.github.io/moviepy/_sources/gallery.txt

I searched for the Cup Song Cover Mix edited by this software. I think it's this one:
https://www.youtube.com/watch?v=rIehsqqYFEM
Notice it doesn't have the 'rel' parameter.

[keikoro]

The rel parameter does not seem to be an issue. It just defines if once the video has stopped playing, related content is shown, see the Youtube IFrame Player API.

When I open the gallery, I don't get prompted to download the files but I don't see the videos either. I tried to reproduce the issue and one problem seems to be that the embeds use a deprecated URL scheme ("AS3 player" instead of "IFrame embed", see this section of the YT docs).

The download prompt seems to be caused by browsing the http version of the gallery containing the old URLs. Changing the URLs to https and the right scheme seems to make them display both on the secure and the non-secure version of the gallery?

Btw. @levimatheri, I'm not entirely sure about this but thought the moviepy docs are located in the gh-pages branch of this repo. (?!)