What is the format name to have a MP4 video as output in ffmpeg?

The following command ffmpeg -f alsa -ac 2 -i plughw:0,0 -f video4linux2 -s vga -i /dev/video0 -f ogg - > video.mp4 Does not produce a .mp4 video. I want to replace -f ogg with -f where ` is the right format to generate a video in .mp4`. To make thinks clear, I want to have: # file video.mp4 video.mp4: ISO Media, MP4 Base Media v1 [IS0 14496-12:2003] ----------------------------------------------------- PS: I want to use pipe, since it is used for other pipe operations