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Streaming media files over Youtube uses Dynamic Adaptive Streaming over HTTP (DASH). Client side receives a manifest file, from which it chooses what type of video quality will it receive, depending on the throughput the client has.

I ran some youtube video, opened Network tab to see the manifest file that determines video quality(to see the code), but I don't know which file performs this quest. Do you know which file serves as the manifest regarding Youtube videos?

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  • IIRC its a variation on a .m3u file. I think they added another letter to the extension, but I forget at the moment
    – infixed
    Jun 22, 2016 at 16:46
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    You are asking an off-topic question. Web services like Facebook, Twitter and YouTube are off topic. See On Topic. Try Web Applications.
    – DavidPostill ♦
    Jun 22, 2016 at 16:47

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