cuvid: activate double-rate deint for formats without header timing info as well
Update ffmpeg
Enable slice threading for YADIF
Use av_cpu_count
Support for FLIC

Signed-off-by: Hendrik Leppkes <h.leppkes@gmail.com>
Cosmetics: Fix some typos

Signed-off-by: Hendrik Leppkes <h.leppkes@gmail.com>