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msdk: set the mfx picture structure to MFX_PICSTRUCT_PROGRESSIVE if it is unknown

Haihao Xiang requested to merge haihao/gst-plugins-bad:msdk-force-picstruct into master

The picture structure in the output parameters from MFXVideoDECODE_Query is set to MFX_PICSTRUCT_UNKNOWN for some codecs, so the structure of the corresponding mfx surfaces created for decoding are unknown. The pipeline will be broken when these surfaces are used as the input for msdkvpp.

Example pipeline:

gst-launch-1.0 filesrc location=input_vp8.webm ! matroskademux ! msdkvp8dec ! msdkvpp ! fakesink

Error message:

0:00:00.031568911 14259 0x55b79dc684a0 ERROR msdkvpp gstmsdkvpp.c:728:gst_msdkvpp_transform: MSDK Failed to do VPP ERROR: from element /GstPipeline:pipeline0/GstMatroskaDemux:matroskademux0: Internal data stream error.

This is a workaround for the above issue

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