parameters as the currently desired codec settings. Thus it is
  important not to fiddle with the streams if you want to keep the
  old data.
* Fix it so that the ?buffer= paramter can be larger than 40 minutes or
  so. Why is this good? So I can use ?buffer=43200 and get video from
  12 hours ago (i.e. when it is daylight outside)

Originally committed as revision 829 to svn://svn.ffmpeg.org/ffmpeg/trunk