codecs: h264decoder: set sys frame num before new_picture()
Derive classes might need to operate on the current frame at their new_picture() vmethod, so it would be needed to set system_frame_number on picture before calling the vmethod.
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Derive classes might need to operate on the current frame at their new_picture() vmethod, so it would be needed to set system_frame_number on picture before calling the vmethod.