JVET-AE0134 item 2: add repeated inference of NNPF for creating pictures corresponding to input pictures at the end of a bitstream or a CLVS under some conditions
JVET-AE0134 item 2: At the end of a bitstream or a CLVS, add repeated inference of NNPF for creating pictures corresponding to input pictures when the purpose indicated by nnpfc_purpose does not include picture rate upsampling and when there are multiple input pictures.