File FormatsLesson 8

Lesson Goals

Know file formats used for images, audio and video

Understand pre-production and final product file formats

Be able to describe properties and limitations of file formats

#limitation#property

Playing Audio and VideoDescribe the different devices that could be used…

Audi

oVi

deo

File Formats

Because there are so many different audio and video playback devices and different ways to distribute files various file formats are required.

Some people will sacrifice quality for smaller file sizes while others may required top quality files regardless of file size.

Audio file formats can vary in: File Size Quality DRM Compression

#limitation#property

Know image, audio and video filesBe able to describe file formats

Video file formats can vary in: File Size Quality Resolution Compression

Audio Files

When comparing the file size of a 3 minute music track saved in different file formats you can clearly see the effect of audio compression:

#limitation#property

Know image, audio and video filesBe able to describe file formats

WAV 30.4mb

WMA 15.6mb

MP3 4.2MB

MP31.4mb

192kbps

64kbps

Video Files

Different file formats render videos in different ways showing a variation:

The OGG file tends to look a little bit dark compared to an MP4 but has the benefit of being a much smaller file size.

#limitation#property

Know image, audio and video filesBe able to describe file formats

OGG MP4

File Formats

When researching file formats remember the following points:

Compression may have good and bad consequences: Properties – Small file sizes would upload quickly. Limitations – File would be a lower quality.

#limitation#property

Know image, audio and video filesBe able to describe file formats

More Compression

Lower Quality Files

Smaller File Sizes

Quicker Upload Speed

File Formats

File formats you could research for your work include:

Know image, audio and video filesBe able to describe file formats

Audio VideoCompressed

Uncompressed

avi

wmv mov

mpg mp4swf

flv

aiff wav

mp3 wma

aacoggflac

Your Task

Create a table showing properties and limitations for audio and video: Big or small file size? Common file or not? Where is it used?

State if the file is compressed or uncompressed.

Know image, audio and video filesBe able to describe file formats

File Properties Limitations Compression

#limitation#property

The following website may help:www.file-extensions.org

Key Words

File Format

Properties

Limitations

The standard way that a digital media file is stored on a computer

Features of the file format such as the size and quality of the file

Something that is a restriction on what you are doing or want to do