title: ffmpeg asyncts usage
body: <p>How can I use the new asyncts in ffmpeg (or avconv)? Which is the right syntax?</p>
  
  <blockquote>
    <p>ffmpeg -i 1.mp4 -i 2.wav -vcodec copy -strict experimental -acodec libmp3lame -ab 128k -f flv -map 0:0 -map 1:0 -filter_complex "asyncts=max_comp" 3.mp4</p>
  </blockquote>
  
  <p>Generates: </p>
  
  <blockquote>
    <p>[asyncts filter @ 0x2a58640] Missing key or no key/value separator
    found after key 'max_comp' [asyncts @ 0x2952380] Error parsing options
    string 'max_comp'. Error initializing filter 'asyncts' with args
    'max_comp'</p>
  </blockquote>