usage: mp4encode [-o output] [-p preset] [-b bitrate] [-m bitrate] video-file... [-avconv-opts]
usage: mp4encode -q video-file
options: -o  single output file
         -p  preset profiles: fast, medium, slow
         -b  average video bitrate in kb/s
         -m  convert audio to mp3 in kb/s
         -q  query video file
         -avconv-opts  see https://trac.ffmpeg.org/wiki/Encode/H.264