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mpeg2dec: drop frame on open gop

Enhance open gop detection to drop B-frame which are invalid before the first reference frame.

In stream such gst-integration-testsuites/medias/defaults/mxf/op2b-mpeg2-wave_hd.mxf, the two first frames must be dropped as we detect an open GOP situation.

But in another media, such as, the first frames should not be dropped as we are in a closed GOP situation.

Edited by Stéphane Cerveau

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