juanpablob

## extract audio from .avi as .aac (conversion from another audio codec)
ffmpeg -i foo.avi -acodec aac -ab 128k -strict experimental bar.aac

## extract audio from .avi as .mp3 (no conversion, just copy)
ffmpeg -i foo.avi -acodec copy bar.mp3

## convert .mp3 to .aac
ffmpeg -i foo.mp3 -acodec aac -ab 128k -strict experimental bar.aac

## extract single frame as image from .mp4