Merge commit 'f64d1100'

* commit 'f64d1100':
  avconv: Flush output BSFs when encode reaches EOF
  vf_deinterlace_vaapi: Add support for field rate output
  pthread_frame: Propagate sw_pix_fmt across threads

This commit is a noop, see
ebce1332
bff7bec1
bc4e33ce

Merged-by: James Almer <jamrial@gmail.com>