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mpeg2dec: drop frame on open gop

Stéphane Cerveau requested to merge dabrain34/gst-plugins-ugly:dab_mpeg2_drop_first_frames into master

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 http://col.la/1920X1080IXDCAMEX5MIN, the first frames should not be dropped as we are in a closed GOP situation.

Edited by Stéphane Cerveau

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