Convert .MKV to .MP4 in Linux with FFMPEG

Convert .MKV to .MP4 in Linux with FFMPEG:

$ ffmpeg -i input.mkv -vcodec copy -ab 128k -acodec libfaac output.mp4

*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.
- Many file formats are supported, for more see $ man ffmpeg