ffmpeg shortcuts

# Convert Video to audio
    ffmpeg -i video.mp4 -c:a pcm_s16le audio.wav 

# Concatenate 2 or more video files
    ffmpeg -i concat: "part1.avi | part2.avi | part3.avi" output.avi
    
# Crop the video
    ffmpeg -i input.avi -ss 00:00:25 -t 00:00:10 -async 1 ouput.avi
                                          where, -i:      input
                                                 -ss:     start time
                                                 -t:      time interval
                                                 -async:  asynchronous
                                                 
# Convert one form to another: avi-->mp4, dat-->avi, etc.,
    ffmpeg -i input.dat -y output.avi -loglevel panic