h264_qsv encoder AVOptions:
  -async_depth       <int>        E..V.... Maximum processing parallelism (from 0 to INT_MAX) (default 4)
  -avbr_accuracy     <int>        E..V.... Accuracy of the AVBR ratecontrol (from 0 to INT_MAX) (default 0)
  -avbr_convergence  <int>        E..V.... Convergence of the AVBR ratecontrol (from 0 to INT_MAX) (default 0)
  -preset            <int>        E..V.... (from 1 to 7) (default medium)
     veryfast                     E..V....
     faster                       E..V....
     fast                         E..V....
     medium                       E..V....
     slow                         E..V....
     slower                       E..V....
     veryslow                     E..V....
  -vcm               <int>        E..V.... Use the video conferencing mode ratecontrol (from 0 to 1) (default 0)
  -rdo               <int>        E..V.... Enable rate distortion optimization (from -1 to 1) (default -1)
  -max_frame_size    <int>        E..V.... Maximum encoded frame size in bytes (from -1 to 65535) (default -1)
  -max_slice_size    <int>        E..V.... Maximum encoded slice size in bytes (from -1 to 65535) (default -1)
  -bitrate_limit     <int>        E..V.... Toggle bitrate limitations (from -1 to 1) (default -1)
  -mbbrc             <int>        E..V.... MB level bitrate control (from -1 to 1) (default -1)
  -extbrc            <int>        E..V.... Extended bitrate control (from -1 to 1) (default -1)
  -adaptive_i        <int>        E..V.... Adaptive I-frame placement (from -1 to 1) (default -1)
  -adaptive_b        <int>        E..V.... Adaptive B-frame placement (from -1 to 1) (default -1)
  -b_strategy        <int>        E..V.... Strategy to choose between I/P/B-frames (from -1 to 1) (default -1)
  -cavlc             <int>        E..V.... Enable CAVLC (from 0 to 1) (default 0)
  -idr_interval      <int>        E..V.... Distance (in I-frames) between IDR frames (from 0 to INT_MAX) (default 0)
  -pic_timing_sei    <int>        E..V.... Insert picture timing SEI with pic_struct_syntax element (from 0 to 1) (default 1)
  -single_sei_nal_unit <int>        E..V.... Put all the SEI messages into one NALU (from -1 to 1) (default -1)
  -max_dec_frame_buffering <int>        E..V.... Maximum number of frames buffered in the DPB (from 0 to 65535) (default 0)
  -look_ahead        <int>        E..V.... Use VBR algorithm with look ahead (from 0 to 1) (default 1)
  -look_ahead_depth  <int>        E..V.... Depth of look ahead in number frames (from 0 to 100) (default 0)
  -look_ahead_downsampling <int>        E..V.... (from 0 to 2) (default unknown)
     unknown                      E..V....
     off                          E..V....
     2x                           E..V....
  -int_ref_type      <int>        E..V.... Intra refresh type (from -1 to 65535) (default -1)
     none                         E..V....
     vertical                     E..V....
  -int_ref_cycle_size <int>        E..V.... Number of frames in the intra refresh cycle (from -1 to 65535) (default -1)
  -int_ref_qp_delta  <int>        E..V.... QP difference for the refresh MBs (from -32768 to 32767) (default -32768)
  -recovery_point_sei <int>        E..V.... Insert recovery point SEI messages (from -1 to 1) (default -1)
  -trellis           <flags>      E..V.... Trellis quantization (default 0)
     off                          E..V....
     I                            E..V....
     P                            E..V....
     B                            E..V....
  -profile           <int>        E..V.... (from 0 to INT_MAX) (default unknown)
     unknown                      E..V....
     baseline                     E..V....
     main                         E..V....
     high                         E..V....
  -a53cc             <int>        E..V.... Use A53 Closed Captions (if available) (from 0 to 1) (default 1)