Encoder libx264 [libx264 H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10]:
    General capabilities: delay threads 
    Threading capabilities: auto
    Supported pixel formats: yuv420p yuvj420p yuv422p yuvj422p yuv444p yuvj444p nv12 nv16 nv21
libx264 AVOptions:
  -preset            <string>     E..V..... Set the encoding preset (cf. x264 --fullhelp) (default "medium")
  -tune              <string>     E..V..... Tune the encoding params (cf. x264 --fullhelp)
  -profile           <string>     E..V..... Set profile restrictions (cf. x264 --fullhelp) 
  -fastfirstpass     <boolean>    E..V..... Use fast settings when encoding first pass (default true)
  -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
  -a53cc             <boolean>    E..V..... Use A53 Closed Captions (if available) (default true)
  -x264opts          <string>     E..V..... x264 options
  -crf               <float>      E..V..... Select the quality for constant quality mode (from -1 to FLT_MAX) (default -1)
  -crf_max           <float>      E..V..... In CRF mode, prevents VBV from lowering quality beyond this point. (from -1 to FLT_MAX) (default -1)
  -qp                <int>        E..V..... Constant quantization parameter rate control method (from -1 to INT_MAX) (default -1)
  -aq-mode           <int>        E..V..... AQ method (from -1 to INT_MAX) (default -1)
     none                         E..V.....
     variance                     E..V..... Variance AQ (complexity mask)
     autovariance                 E..V..... Auto-variance AQ
     autovariance-biased              E..V..... Auto-variance AQ with bias to dark scenes
  -aq-strength       <float>      E..V..... AQ strength. Reduces blocking and blurring in flat and textured areas. (from -1 to FLT_MAX) (default -1)
  -psy               <boolean>    E..V..... Use psychovisual optimizations. (default auto)
  -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) (default -1)
  -weightb           <boolean>    E..V..... Weighted prediction for B-frames. (default auto)
  -weightp           <int>        E..V..... Weighted prediction analysis method. (from -1 to INT_MAX) (default -1)
     none                         E..V.....
     simple                       E..V.....
     smart                        E..V.....
  -ssim              <boolean>    E..V..... Calculate and print SSIM stats. (default auto)
  -intra-refresh     <boolean>    E..V..... Use Periodic Intra Refresh instead of IDR frames. (default auto)
  -bluray-compat     <boolean>    E..V..... Bluray compatibility workarounds. (default auto)
  -b-bias            <int>        E..V..... Influences how often B-frames are used (from INT_MIN to INT_MAX) (default INT_MIN)
  -b-pyramid         <int>        E..V..... Keep some B-frames as references. (from -1 to INT_MAX) (default -1)
     none                         E..V.....
     strict                       E..V..... Strictly hierarchical pyramid
     normal                       E..V..... Non-strict (not Blu-ray compatible)
  -mixed-refs        <boolean>    E..V..... One reference per partition, as opposed to one reference per macroblock (default auto)
  -8x8dct            <boolean>    E..V..... High profile 8x8 transform. (default auto)
  -fast-pskip        <boolean>    E..V..... (default auto)
  -aud               <boolean>    E..V..... Use access unit delimiters. (default auto)
  -mbtree            <boolean>    E..V..... Use macroblock tree ratecontrol. (default auto)
  -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) (default -1)
  -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) (default -1)
     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) (default -1)
  -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) (default -1)
     none                         E..V.....
     vbr                          E..V.....
     cbr                          E..V.....
  -avcintra-class    <int>        E..V..... AVC-Intra class 50/100/200 (from -1 to 200) (default -1)
  -me_method         <int>        E..V..... Set motion estimation method (from -1 to 4) (default -1)
     dia                          E..V.....
     hex                          E..V.....
     umh                          E..V.....
     esa                          E..V.....
     tesa                         E..V.....
  -motion-est        <int>        E..V..... Set motion estimation method (from -1 to 4) (default -1)
     dia                          E..V.....
     hex                          E..V.....
     umh                          E..V.....
     esa                          E..V.....
     tesa                         E..V.....
  -forced-idr        <boolean>    E..V..... If forcing keyframes, force them as IDR frames. (default false)
  -coder             <int>        E..V..... Coder type (from -1 to 1) (default default)
     default                      E..V.....
     cavlc                        E..V.....
     cabac                        E..V.....
     vlc                          E..V.....
     ac                           E..V.....
  -b_strategy        <int>        E..V..... Strategy to choose between I/P/B-frames (from -1 to 2) (default -1)
  -chromaoffset      <int>        E..V..... QP difference between chroma and luma (from INT_MIN to INT_MAX) (default -1)
  -sc_threshold      <int>        E..V..... Scene change threshold (from INT_MIN to INT_MAX) (default -1)
  -noise_reduction   <int>        E..V..... Noise reduction (from INT_MIN to INT_MAX) (default -1)
  -x264-params       <string>     E..V..... Override the x264 configuration using a :-separated list of key=value parameters


