Use fallback Youtube server if local cache is unavailable

[ceyt]

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When Google CDN server peered or hosted by local ISP (blah-blah-blah.googlevideo.com) that holds media files is unavailable, youtube-dl just hangs on TCP connect and returns a system error after a timeout. It's an obvious, straightforward behavior. However, the website (at least default Javascript player served for Firefox) checks if any data from server is available after 5 seconds, and automatically reconnects to a different (global/anycast?) CDN server (in my case, r6---sn-4g57kn6e.googlevideo.com) to play the video. I guess they bothered to handle that case because of the total amount of Google cache nodes, and ubiquitous network problems and misconfigurations.

I think it's a rare case where youtube-dl is less resilient and useful than the official way of watching Youtube.

Steps to reproduce: set iptables to drop packets to CDN servers Google picks for your IP address range, check what player on the website does.

[ghost]

I'm currently having this same problem as of yesterday. The URLs I'm getting (https://r6---sn-bvvbax-hjpe.googlevideo.com/videoplayback?blahblahblah) don't load at all, which would seem to be a problem at Youtube's end. Some kind of option to try for a different mirror would be great, as right now I'm at Google's mercy to fix this particular mirror.

Edit: Looks like there's https://redirector.googlevideo.com, which I'd assume is to redirect you to different mirrors (it's defined as "fallback_host" in https://www.youtube.com/get_video_info?&video_id=_____), but it keeps sending me to the same mirror. Not sure how to make it give me a different one.

[yan12125]

Related: #3721