How to convert video to avi with FFmpeg

#!/bin/bash
ffmpeg -i input.mp4 \
    -vcodec libxvid \
    -filter:v scale="640:trunc(ow/a/2)*2" \
    -b:v 1000k \
    output.avi
  • Input: input.mp4
  • Video codec: libxvid
  • Size: 640x
  • Video bitrate: 1000k
  • Output: output.avi