msdkh264dec: when playing 1080P 60fps it shows lots of frames dropped, comparing vaapih264dec in same hardware

Submitted by lon..@..el.com

Link to original bug (#797040)

Description

Created attachment 373489
GST_DEBUG log

When using msdkh264dec, fpsdisplaysink and glimagesink in pipeline, there are a few frames dropped when playing 1080P media by msdk, especially during the starting period.
Test command:
gst-launch-1.0 filesrc location=./1080P_HOBIT3_1920x1080_2700frames.yuv_cbr_bt2000_ipb.h264 ! h264parse ! msdkh264dec ! fpsdisplaysink video-sink=glimagesink

Attachment 373489, "GST_DEBUG log":
msdk_45framesdropped.zip