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It verifies that the beginning of a file is mp4 format. I'm actually running go 1.6 which does have the mp4 sniffing enabled.

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I was under the impression than MP4 could have all of its format specific headers at the end of the file just as well as the beginning according to the spec.

That is correct, however the beginning of the file does have a signature: https://mimesniff.spec.whatwg.org/#signature-for-mp4

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