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-vo vaapi command line help:
Example: mplayer -vo vaapi:gl

Options:
  dm
    0: use least-recently-used VA surface
    1: identify VA surface with MPI index
    2: auto-detect use of direct surface mapping (default)
  deint (all modes > 0 respect -field-dominance)
    0: no deinterlacing (default)
    1: only show first field
    2: bob deinterlacing
  colorspace
    0: guess based on video resolution
    1: ITU-R BT.601 (default)
    2: ITU-R BT.709
    3: SMPTE-240M
  scaling
    default: use implementation default (default)
    fast:    use fast scaling, but possibly with less quality
    hq:      use high-quality scaling, but possibly slower
    nla:     use non-linear anamorphic scaling
  gl
    Enable OpenGL rendering
  glfinish
    Call glFinish() before swapping buffers
  tfp
    Use GLX texture-from-pixmap instead of VA/GLX extensions
  reflect
    Enable OpenGL reflection effects
  xrender
    Enable Xrender rendering, thus vaPutSurface() to a Pixmap