avconv [input options] -i <input> [output options] <outputfile>

for most options a stream can be specified: -c:a will set the codec for the audio stream

  * -b bitrate (500k, 4M)
  * -c codec (mpeg4)
  * -r framerate (24)
  * -s scale (hd480)
  * -aspect x:y (16:9)

video codecs examples

  * libxvid
  * mpeg4
  * h264

audio codec examples

  * libmp3lame
  * mp2

scale examples

  * hd480
  * hd720