Merge remote-tracking branch 'qatar/master'

* qatar/master:
  libx265: Only set the SAR if it is valid
  libx265: Use 16-bit SAR
  libx265: Use x265_param_parse to set the SAR

See: 8945dcbb
See: fcc43e02
See: cdd21f1fMerged-by: Michael Niedermayer <michaelni@gmx.at>