Merge commit '45df7adc'

* commit '45df7adc':
  imgutils: add function to clear an image to black
  lavc, lavu: move frame cropping to a convenience function
  rmdec: add missing brackets to compound statement

This commit is a noop, see
65b83ce0
caa12027
463b81deMerged-by: James Almer <jamrial@gmail.com>