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