Common Options

• Multi-pass encoding
  Encode in multiple passes, which is useful for bitrate-based encoding. This can be achieved by putting a semicolon between options for differenc passes, for example:
  

  bitrate=??? pass=1; bitrate=??? pass=2

• Multi-threading
  For encoders that support multi-threading (using multiple processor cores simultaneously), you can use a special variable which will be replaced by the number of CPU cores.
  

  %(threads)s

  If an encoder has the option threads then this would look like:
  

  threads=%(threads)s