Merge commit '2b1324bd'

* commit '2b1324bd':
  lavf: allow avformat_close_input() with NULL
  dxva: DXVA2_ModeHEVC_VLD_Main10 does not support Main
  caf: add an Opus tag
  hevc: Make sure to update the current frame transfer characteristic

This commit is a noop, see
dc9735eb
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c64da19b
36cd017aMerged-by: James Almer <jamrial@gmail.com>