Frames greater than 8K treated as impossible

We routinely work with videos with at least one dimension greater than 8K. This is making impossible to use them in libvlc. Furthermore, we are well beyond 8K in a while :)

See his commit from 2014 which causes the problem: https://github.com/videolan/vlc/commit/bd467e94d1c7e5d64b9df31e760c01b390c184d4

(marked this as defect/bug for obvious reason)