Computer Science 1033A/B Lecture Notes - Lecture 1: Digital Container Format, Sorenson Media, Key Frame

• School: Western University
• Department: Computer Science
• Course: Computer Science 1033A/B
• Professor: Vivi Tryphonopolous

Document Summary

Because we need to make the video file a lot smaller. Lower the frame rate of the video (frame/sec) A piece of code or program (sorenson spark, h. 264, divx) If sometimes you get a piece of video on your machine and then not be able to play it, this is because you are missing the appropriate codec! Codecs depend on the file format (there is one particular codec that may be more adaptable than another) Compression strategies: pick a codec that does higher compression, lower the picture quality of the video. Two types of compression strategies: spatial compression (tennis court example, temporal compression (jimmy fallon example) Similarities are encoded by identifying differences: within a frame --- spatial, between frames --- temporal. Spatial: looks for similarity within a frame looks for similarities within a frame. Temporal: identifies differences between frames and stores them relative to a keyframe.