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Based on http://vfrmaniac.fushizen.eu/contents/opus_in_isobmff.html
3c09b44 Import mp4 encapsulation spec v0.1.4. doc/opus_in_isobmff.html | 699 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 699 insertions(+)
Upstream: git.xiph.org