Is your feature request related to a problem? Please describe.

So I tried testing a few NSFW subreddits, and it looks like NSFW subreddits that use redgifs for videos have no audio. (The DASH and HLS manifests don't contain them) The official website seems to just embed these. A lot of other clients can't play these, though I've seen some mobile clients able to.

Describe the feature you would like to be implemented

Redgifs extraction support/audio for it

Describe alternatives you've considered

We could allow embedding iframes? I personally don't like this idea, however.

Additional context / screenshot

This could be marked as a low priority issue.
Example URL: https://libreddit.kavin.rocks/r/porn (Warning: NSFW content)
dash.js would be necessary for loading these, we could probably replace hls.js while at it.