[Coco] An OT video format question

[Dave Kelly]

What paper/list/tutoral do I read to find out what codec produces which 
video format?

For instance, in the command line below,  how do I know that mpeg4 
produces .avi formated video? And  what audio format is pcm_s16le?


ffmpeg -r 25 -s 384x288 -b 5000 -ar 44100 -vd /dev/v4l/video0 -qmin 2 
-vcodec mpeg4 -me zero -acodec pcm_s16le -ac 1 -y -t 3600 foo.avi