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If video is being served via HLS (which it probably is in 2018), then the manifests support redundant streams, where multiple hosts can be specified for each stream. [0]

hls.js supports this, as do many other clients. IME it works nicely for providing some client-side switching in case one of your hosts/CDNs goes down.

[0] https://developer.apple.com/library/archive/documentation/Ne...

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Both HLS and DASH support redundant streams (by adding a redundant variant URL in the HLS playlist and multiple BaseURLs in the DASH manifest). It's indeed the simplest way to have the easiest way to have a fallback client-side. If you use it, you should make sure that the player supports it, and that the retry mechanisms are rightly configured (like for instance all the MaxRetry config params in hls.js: https://github.com/video-dev/hls.js/blob/master/docs/API.md#... )

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