A video is a series of images displayed quickly with sound. This lesson explains how video is stored on computers and lists common file extensions for sound, images, video, and text. Some key file extensions covered are MIDI, which stores musical instrument commands instead of audio signals, and MP3, WAV, JPEG, GIF, PNG, BMP, AVI, MP4, and MOV for different audio, image, and video file types.

1. Computer Science
CIE-Syllabus 2210
Lesson 18
Video/File-extensions
Tutor: Suraj Motee

2. Learning outcomes
By the end of this lesson, you should be able to :
a) Explain how video is stored on the computer.
b) List common file extensions for sound, images, video & text.

3. What is a video?
A series of images displayed quite fast enough
with a combination of sound.

4. File Extensions-Sound

5. MIDI
• stands for Musical Instrument Digital Interface. It is an agreed
protocol from the early 80s that allows computers, digital
musical instruments and other hardware to communicate
musical instructions, regardless of manufacturer.
• Unlike other audio formats that transmit representations of
musical sounds, MIDI only stores or transmits commands
about the music (the notes etc), and not audio signals.