Computer Science 1033A/B Lecture Notes - Lecture 10: Video Codec, Sorenson Media, Key Frame

• School: Western University
• Department: Computer Science
• Course: Computer Science 1033A/B
• Professor: Laura Reid

Document Summary

Lecture #10 intro to video (part 2) 1440 x 1080 pixels 1,555,200 pixels per frame. 1,555,200 x 24 bits per pixel (for color) = 37,324,800 bits per frame. 37,324,800 * 30 frames per second * 1 second= 1,119,744,000 bits/8 = 139,968,000 bytes =133mb. 133mb + 188kb =~ 133mb lots of storage for just 1 sec. Thus a dvd could hold 35 seconds of uncompressed video. Recap: in order for video to be used in a multimedia application: One thing to think about: what we did to an image to make it smaller. If it was 640 by 480, change it to 320 by 240, less pixels! 2. lower the frame rate of the video (frames/sec) Changing the frame rate by (say 20 fps to 10fps) - will generally the file size. Compresses video or audio as it is created (exported from the editing software) And then when displaying (playing) it to the user decompresses the video or audio.