Inserts long-term picture dynamically in a GOP and uses LT reference for particular picture based on user input.
Sample Gstreamer application cmd line option to insert a longterm picture at frame 10:
>> zynqmp_vcu_encode -w 3840 -h 2160 -e avc -o /run/op.h264 -i /run/input.yuv -d IL:10
Command line option to use LTR for frame 15:
>> zynqmp_vcu_encode -w 3840 -h 2160 -e avc -o /run/op.h264 -i /run/input.yuv -d UL:15