title: What is this MIME type 'video/3gpp; codecs=avc1.42E00C, mp4a.40.2"'?
body: <p>I have to process these mime type string.</p>
  
  <p>For "avc1.42E00C", I guess 'avc1' means H.264 codec and '42E00C' specify codec version or profile ?</p>
  
  <p>Where can I found reliable information?</p>
  
  <p>If full specification/list are hard to obtain, only 'avc1' and 'mp4a' related information would be very helpful</p>