Convert .FLV to .AVI in Linux with FFMPEG

Convert .FLV to .AVI and vice versa in Linux with FFMPEG
(and vice versa)

$ ffmpeg -i input.flv -sameq output.avi

or

$ ffmpeg -i input.avi -sameq output.flv

*NOTES:

- Where input is the source file and output the outcome file.

- the $ sign at the start of the command is to signify the terminal's prompt, no need to type this in.