Take the 2-minute tour ×  I'm parsing h264 NAL Units. In my
sequence - there are NAL Units with picture parameters set,
sequence parameters set, I frames (they are also IDR) and P
frames (I and P frames consits of single slice). (No B frames at
all)  So I have the stream of NAL Units looks like:  [SPS] [PPS]
[I(IDR)] [P] [P] [P] ... [P] [P] [SPS] [PPS] [I(IDR)] [P] [P]
[P] ....  Each I frame in my stream is also IDR frame, so its
frame_num is 0 (acording to h.264 standart).  Also each P frame
has frame_num per unit greater than the previous frame.  But,
I'm confused about pic_order_cnt_lsb.  What does
pic_order_cnt_lsb represents?  In my sequence:    • if P frame
has frame_num==2 its pic_order_cnt_lsb==4   • if P frame has
frame_num==3 its pic_order_cnt_lsb==6   • if P frame has
frame_num==4 its pic_order_cnt_lsb==8   • etc... (in my
situation pic_order_cnt_lsb == 2*frame_num)  And why there is
such correlation between frame_num and pic_order_cnt_lsb?
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