Youtube video is not playing.

[danielwang24139212]

I installed Mozilla hubs as well as reticulum and spoke on my local machine.
They work well. But got one problem.
Video element on spoke returns error.
I set youtube_api_key in dev.exs file.
Are there additional settings for video playing?

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Tenor gifs are working perfectly.
Just youtube videos go on failing.

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And what is ytdl_host?
Is this a necessary setting for playing youtube videos?
I think I should install the extra server for a youtube downloader.

Please help me to add a video element to my local spoke.
thanks.