document the release process
lavc,lavfi: fix calculating the plane size in the AVBufferRef wrappers

It is supposed to be height * linesize, not width * linesize.
Thanks to Hendrik Leppkes for pointing out the bug.
Merge commit '23f4c5acc438366d84cacf49e33b0bcd72f04937'

* commit '23f4c5acc438366d84cacf49e33b0bcd72f04937':
  document the release process

Merged-by: Michael Niedermayer <michaelni@gmx.at>
Merge remote-tracking branch 'qatar/master'

* qatar/master:
  lavc,lavfi: fix calculating the plane size in the AVBufferRef wrappers

Merged-by: Michael Niedermayer <michaelni@gmx.at>
ffplay: remove unused variable "codec"

Fix warning:
ffplay.c: In function ‘video_thread’:
ffplay.c:1890:21: warning: unused variable ‘codec’ [-Wunused-variable]
ffplay: remove options skiploop, skipidct, skipframe

The corresponding codec options (skip_loop, skip_idct, skip_frame) can be
set in a more flexible way.

This technically causes a user interface break, but since the options
were not even documented and we just released a major version that should
not be a serious issue.
lavfi/swapuv: remove deprecated base field use
h264_refs: fix typo in refs fallback check

Fixes regression since 01a0283
Fixes Ticket2371

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