YouTube live videos won't autoplay due to missing "mute" url parameter

Thanks for this! I added a couple other parameters for YouTube when it's used as background image to suppress the controls, set the loop and a playlist param so it continues to play.

Patch attached.

Fixed patch.

Applied the patch, but the background YouTube video is still not autoplay :-(
Using Drupal core 10.2.3 with Media oEmbed Control 2.0.0-beta3.

The problem is in HTML::load(), HTML::saveHTML().
The "allowfullscreen" attribute becomes allowfullscreen="" and farther replacement doesn't work.

I've added a small change to make the patch work, although I'd like to have it reviewed in case anyone has a better solution.

The patch works for me, the video is playing automatically now. Thank you!

EDIT: Actually, it depends on the video, if there is any special character like quote in the video, then it does not work.
It is due to the replacement.>
For example using this video: https://www.youtube.com/watch?v=UKcWushnRpQ

In the old tag, it will be:
title="Amir - États d'amour (Clip officiel)"
In the new tag, it will be:
title="Amir - États d'amour (Clip officiel)"

So the replacement doesn't work and the autoplay will not apply. I had a hard time to find the reason, I was becoming crazy. So happy I found the origin of the issue.

I'm working on a patch, coming soon...

Ok changes pushed to the merge request branch.

EDIT: I am not sure what's going on with the dev branch 2.x but impossible to pull it through composer.

Ok I pushed a new change reverting the encoding to use a single replace instead. It seems some characters like & are already & but the apostrophe is not. So the previous change broke videos with other special characters.

If we were directly using $dom->saveHTML then the issue would not even occur but since it creates problems with the css placeholders we cannot get rid of the str_replace approach and use saveHTML.

So I went down the road to use another replace to handle that case. The code for the apostrophe is not even ' but ' which I find strange as well.

The str_replace approach might have unexpected issues that we are not aware of, but so far the branch worked very well in that version and I could get all videos that I tested in autoplay.

I've reduced the str_replace to change only the src address, since that is the only thing we are changing on the markup I thought it would be cleaner that way

I can confirm that the https://www.drupal.org/project/media_oembed_control/issues/3380731#comme... works for youtube videos to support autoplaying.

so please merge the https://git.drupalcode.org/project/media_oembed_control/-/merge_requests...

Thank you!