[ffmpeg] ffmpeg encode raw audio (pcm) into other formats (mp3, aac, wav, etc)

input raw audio info:

sample rate: 44.1k

sample format: 16bit signed integer, little endian

channel numbers: 2

encoding the raw pcm audio into .wav using ffmpeg, command line:

ffmpeg -f s16le -ar 44.1k -ac 2 -i input_file.pcm output_file.wav

thanks to http://stackoverflow.com/questions/11986279/can-ffmpeg-convert-audio-from-raw-pcm-to-wav