[Bug 796468] msdk: detail vpp has no expected effect

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=796468

--- Comment #5 from Fei <fei.w.wang at intel.com> ---
I checked sample_vpp_config.cpp in msdk, its usage is create a video filter ID
without setting its value, then link the filter ID to vppdouse, and add
vppdouse into mfxVidoeParam. After that, re-configure the video filter's value,
and add it into mfxVideoParam. I also tested this way in gst-msdk with some
ugly code,it does work. Since remove vppdouse also looks good, I uploaded the
patch first. We may keep this in mind, maybe it's helpful when add query
supported features:)

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