Computer Science 1033A/B Lecture Notes - Lecture 8: Flash Video, Tempora, Progressive Download

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

Document Summary

Codec piece of code that compresses video/audio as it is created: when displaying it to the user, it decompresses the video/audio, you have to use the same one to compress and decompress, most common codecs. Sorenson spark, h. 264, divx: sometimes depend on the file format. Give info for which codec needs to be used to play back. Compression concepts: temporal compression vs. spatial compression. Spatial compress each frame individually (looks for blocks) Best for high action videos (fast movement) Good when difference between current frame and keyframe is small. Ex. saves background bc bird doesn"t move for a while. Good for jimmy fallon bc not a lot going on. Codecs sorenson video, h. 264: lossy vs. lossless compression. Looks for large blocks of pixels that are the same to do rle. Lossy small file size, doesn"t look as good. Codecs microsoft rle, intel indeo video, cinepak windows, but. Compression based on connection speed need real player.