rawvid: fix parsing frame and aspect ratii (fixes #13532)
rawvid: fix parsing frame and aspect ratii (fixes #13532)

(cherry picked from commit c25d1cefc350a39ef76d1f3481879b27459816a7)

jomanmuk/vlc-2.2,jomanmuk/vlc-2.2,jomanmuk/vlc-2.2,jomanmuk/vlc-2.2,jomanmuk/vlc-2.2,jomanmuk/vlc-2.2,jomanmuk/vlc-2.2