vaapipostproc: when negotiates DMABuf with glimagesink only two frames are rendered

vaapipostroc, when negotiates DMABuf with glimagesink only renders two frames

old message: (which now is invalid)

VC1 decode crash while running below command:

gst-launch-1.0 filesrc location=Cactus_1920x1080_5.6mbps_30fps_Advanced_L3.wmv ! asfdemux ! vaapivc1dec ! vaapipostproc ! glimagesink

Debug crash logs attached gst-vc1-segfault-12feb.txt