Encoder libx264 [libx264 H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10]:
    Threading capabilities: no
    Supported pixel formats: yuv420p yuvj420p yuv422p yuv444p
libx264 AVOptions:
-preset            <string>     E..V.. Set the encoding preset (cf. x264 --fullhelp)
-tune              <string>     E..V.. Tune the encoding params (cf. x264 --fullhelp)
-profile           <string>     E..V.. Set profile restrictions (cf. x264 --fullhelp) 
-fastfirstpass     <int>        E..V.. Use fast settings when encoding first pass (from 0 to 1)
-level             <string>     E..V.. Specify level (as defined by Annex A)
-passlogfile       <string>     E..V.. Filename for 2 pass stats
-wpredp            <string>     E..V.. Weighted prediction for P-frames
-x264opts          <string>     E..V.. x264 options
-crf               <float>      E..V.. Select the quality for constant quality mode (from -1 to FLT_MAX)
-crf_max           <float>      E..V.. In CRF mode, prevents VBV from lowering quality beyond this point. (from -1 to FLT_MAX)
-qp                <int>        E..V.. Constant quantization parameter rate control method (from -1 to INT_MAX)
-aq-mode           <int>        E..V.. AQ method (from -1 to INT_MAX)
   none                         E..V..
   variance                     E..V.. Variance AQ (complexity mask)
   autovariance                 E..V.. Auto-variance AQ (experimental)
-aq-strength       <float>      E..V.. AQ strength. Reduces blocking and blurring in flat and textured areas. (from -1 to FLT_MAX)
-psy               <int>        E..V.. Use psychovisual optimizations. (from -1 to 1)
-psy-rd            <string>     E..V.. Strength of psychovisual optimization, in <psy-rd>:<psy-trellis> format.
-rc-lookahead      <int>        E..V.. Number of frames to look ahead for frametype and ratecontrol (from -1 to INT_MAX)
-weightb           <int>        E..V.. Weighted prediction for B-frames. (from -1 to 1)
-weightp           <int>        E..V.. Weighted prediction analysis method. (from -1 to INT_MAX)
   none                         E..V..
   simple                       E..V..
   smart                        E..V..
-ssim              <int>        E..V.. Calculate and print SSIM stats. (from -1 to 1)
-intra-refresh     <int>        E..V.. Use Periodic Intra Refresh instead of IDR frames. (from -1 to 1)
-b-bias            <int>        E..V.. Influences how often B-frames are used (from INT_MIN to INT_MAX)
-b-pyramid         <int>        E..V.. Keep some B-frames as references. (from -1 to INT_MAX)
   none                         E..V..
   strict                       E..V.. Strictly hierarchical pyramid
   normal                       E..V.. Non-strict (not Blu-ray compatible)
-mixed-refs        <int>        E..V.. One reference per partition, as opposed to one reference per macroblock (from -1 to 1)
-8x8dct            <int>        E..V.. High profile 8x8 transform. (from -1 to 1)
-fast-pskip        <int>        E..V.. (from -1 to 1)
-aud               <int>        E..V.. Use access unit delimiters. (from -1 to 1)
-mbtree            <int>        E..V.. Use macroblock tree ratecontrol. (from -1 to 1)
-deblock           <string>     E..V.. Loop filter parameters, in <alpha:beta> form.
-cplxblur          <float>      E..V.. Reduce fluctuations in QP (before curve compression) (from -1 to FLT_MAX)
-partitions        <string>     E..V.. A comma-separated list of partitions to consider. Possible values: p8x8, p4x4, b8x8, i8x8, i4x4, none, all
-direct-pred       <int>        E..V.. Direct MV prediction mode (from -1 to INT_MAX)
   none                         E..V..
   spatial                      E..V..
   temporal                     E..V..
   auto                         E..V..
-slice-max-size    <int>        E..V.. Limit the size of each slice in bytes (from -1 to INT_MAX)
-stats             <string>     E..V.. Filename for 2 pass stats
-nal-hrd           <int>        E..V.. Signal HRD information (requires vbv-bufsize; cbr not allowed in .mp4) (from -1 to INT_MAX)
   none                         E..V..
   vbr                          E..V..
   cbr                          E..V..
-x264-params       <string>     E..V.. Override the x264 configuration using a :-separated list of key=value parameters

