[FFmpeg-user] Usage of -f mpegts option

[m.kamalasubha m.kamalasubha]

Hello Guys,
I am able to generate output file in mp4 format taking input in ts format
using the below command.
 * ffmpeg -f mpegts -i <input.ts> <output.mp4>*

Can you please explain in detail what *-f mpegts* option does internally to
do the conversion ?