Merge commit '6e7b50b4270116ded8b874d76cb7c5b1a0341827'

* commit '6e7b50b4270116ded8b874d76cb7c5b1a0341827':
  mpegvideo_enc: drop support for reusing the input motion vectors.

Conflicts:
	libavcodec/motion_est.c

Merged-by: Michael Niedermayer <michaelni@gmx.at>

diff --cc libavcodec/motion_est.c
Simple merge

diff --cc libavcodec/mpegvideo_enc.c
Simple merge