AS-11 X4:

MXF Program Contribution - HD Long GOP (23.98p (24/1.001p), 59.94p (60/1.001p))

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This is a Specification in the AS-11 family of Specifications.  It defines an MXF file format for the delivery of finished HD programs.

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See the specification - Full Specification on GitHub

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At present, there is no Certification program set up for this specification.