What framework does YouTube use?

Contrary to popular belief, YouTube was first built with PHP when it started, and not Python. It subsequently got replaced by Python in a piece-meal migration within 3 months after its public launch, using the mod_python Apache module and very likely the mpservlets framework .

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What technologies does YouTube use?

Video technology. YouTube primarily uses the VP9 and H.264/MPEG-4 AVC video codecs, and the Dynamic Adaptive Streaming over HTTP protocol . MPEG-4 Part 2 streams contained within 3GP containers are also provided for low bandwidth connections. By January 2019, YouTube had begun rolling out videos in AV1 format.

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