Encoder libvpx [libvpx VP8]:
    General capabilities: delay threads 
    Threading capabilities: auto
    Supported pixel formats: yuv420p yuva420p
libvpx-vp8 encoder AVOptions:
  -auto-alt-ref      <int>        E..V..... Enable use of alternate reference frames (2-pass only) (from -1 to 2) (default -1)
  -lag-in-frames     <int>        E..V..... Number of frames to look ahead for alternate reference frame selection (from -1 to INT_MAX) (default -1)
  -arnr-maxframes    <int>        E..V..... altref noise reduction max frame count (from -1 to INT_MAX) (default -1)
  -arnr-strength     <int>        E..V..... altref noise reduction filter strength (from -1 to INT_MAX) (default -1)
  -arnr-type         <int>        E..V..... altref noise reduction filter type (from -1 to INT_MAX) (default -1)
     backward                     E..V.....
     forward                      E..V.....
     centered                     E..V.....
  -tune              <int>        E..V..... Tune the encoding to a specific scenario (from -1 to INT_MAX) (default -1)
     psnr                         E..V.....
     ssim                         E..V.....
  -deadline          <int>        E..V..... Time to spend encoding, in microseconds. (from INT_MIN to INT_MAX) (default good)
     best                         E..V.....
     good                         E..V.....
     realtime                     E..V.....
  -error-resilient   <flags>      E..V..... Error resilience configuration (default 0)
     default                      E..V..... Improve resiliency against losses of whole frames
     partitions                   E..V..... The frame partitions are independently decodable by the bool decoder, meaning that partitions can be decoded even though earlier partitions have been lost. Note that intra predicition is still done over the partition boundary.
  -max-intra-rate    <int>        E..V..... Maximum I-frame bitrate (pct) 0=unlimited (from -1 to INT_MAX) (default -1)
  -crf               <int>        E..V..... Select the quality for constant quality mode (from -1 to 63) (default -1)
  -static-thresh     <int>        E..V..... A change threshold on blocks below which they will be skipped by the encoder (from 0 to INT_MAX) (default 0)
  -drop-threshold    <int>        E..V..... Frame drop threshold (from INT_MIN to INT_MAX) (default 0)
  -noise-sensitivity <int>        E..V..... Noise sensitivity (from 0 to 4) (default 0)
  -undershoot-pct    <int>        E..V..... Datarate undershoot (min) target (%) (from -1 to 100) (default -1)
  -overshoot-pct     <int>        E..V..... Datarate overshoot (max) target (%) (from -1 to 1000) (default -1)
  -cpu-used          <int>        E..V..... Quality/Speed ratio modifier (from -16 to 16) (default 1)
  -speed             <int>        E..V.....  (from -16 to 16) (default 1)
  -quality           <int>        E..V.....  (from INT_MIN to INT_MAX) (default good)
     best                         E..V.....
     good                         E..V.....
     realtime                     E..V.....
  -vp8flags          <flags>      E..V.....  (default 0)
     error_resilient              E..V..... enable error resilience
     altref                       E..V..... enable use of alternate reference frames (VP8/2-pass only)
  -arnr_max_frames   <int>        E..V..... altref noise reduction max frame count (from 0 to 15) (default 0)
  -arnr_strength     <int>        E..V..... altref noise reduction filter strength (from 0 to 6) (default 3)
  -arnr_type         <int>        E..V..... altref noise reduction filter type (from 1 to 3) (default 3)
  -rc_lookahead      <int>        E..V..... Number of frames to look ahead for alternate reference frame selection (from 0 to 25) (default 25)


