Merge commit 'b78c30d7'

* commit 'b78c30d7':
  lavc: Add mpeg2_metadata bitstream filter
  lavc: Add coded bitstream read/write support for MPEG-2
  cbs_h2645: Return error if writing fails
  h264dec: use a large enough field for reference list modification values
  xwddec: support 8bpp grayscale

This commit is a noop, see
b9c94e82
2aff557c
b4c915f4
686e388b
569721acMerged-by: James Almer <jamrial@gmail.com>