vdpau_deinterlace not working with frame interlaced fields

When using vdpau_deinterlace (radeon, gallium) , the result is corrupt.

The output is the same as feeding f1 & f2 as frames and setting current to field.

The VdpVideoMixer documentation refers to fields and VdpVideoSurface outputting fields only for interlaced content. https://http.download.nvidia.com/XFree86/vdpau/doxygen/html/

Seems there's no deinterlace support for non split fields, but we feed only with frames.

This might be implementation specific, so we might need driver blacklist in that case.

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