cinelerra-5.1/ffmpeg/video/faststart_h264.mp4

   1 fmp4 libx264
   2 crf=28
   3 maxrate=20000000
   4 bufsize=20000000
   5 preset=veryslow
   6 profile=high
   7 level=41
   8 bf=8
   9 refs=4
  10 # use framerate for 1 keyframe/sec, needed for seeks
  11 x264opts cabac=1:me_range=24:bframes=8:keyint=60:keyint_min=25:qpmin=0:qpmax=69:qpstep=4