Compression

Lesson Instructions

Watch and follow the YouTube video, the lesson contains three parts:

Key Information and content - all you need to do here is watch and listen
Learning activity - this activity involves answering different questions about Compression
Consolidation - these are past exam question and are for deliberate practice to check your understanding.

Compression Full Lesson Video.mp4

Task - Lossy Vs Lossless

Task - Exam Questions - Deliberate Practice

Exam Questions - Web

Mark Scheme

Question 8 (a)

Reduce the size of the file
Transmits more quickly / uses less bandwidth - Accept other advantages to do with sending files.

Question 8 (b) (i)

Lossless compression
The code has to be exactly as it was originally written...
...Or else it will not work

Question 8 (b) (ii)

Lossy compression
Achieves higher compression / smaller file size / faster streaming than lossless
Video can still be viewed at a lower quality (from the data compressed)

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