Lecture 5: CSCI E-1 Spring 2013 - Speaker Deck

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Computer Science E-1 Lecture 5: Multimedia

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Exam I

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http://www.cnn.com/2013/03/10/ tech/web/grumpy-cat-sxsw

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http://www.theonion.com/video/ youtube-contest-challenges-users- to-make-a-good-vi,14288/

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Multimedia

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File Formats

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http://download.microsoft.com/download/0/B/E/ 0BE8BDD7-E5E8-422A-ABFD-4342ED7AD886/ Word97-2007BinaryFileFormat%28doc %29Speciﬁcation.pdf

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Interpreting Bits

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Raster Graphics

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Pixels

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Colors

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Additive Color Mixing

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Color Depth

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RGB

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#FF0000

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#0088FF

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http://www.html-color-names.com/ color-chart.php

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Subtractive Color Mixing

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CMYK

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Bitmaps

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Magic Numbers

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0x42 0x4D

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Metadata

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xxd

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Resolution

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http://www.youtu.be/Vxq9yj2pVWk

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Compression

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Lossless Compression

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Lossy Compression

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Hey wat r u doin tmrw? I wntd 2 go 2 c Ben.

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Hey, what are you doing tomorrow? I wanted to go see Ben.

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JPEG

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Alpha

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Animated GIFs

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http://whatshouldwecallme.tumblr.com/

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Name Extension Compression Color Alpha Bitmap .bmp No 24-bit No GIF .gif Lossless 8-bit No JPEG .jpg, .jpeg Lossy 24-bit No PNG .png Lossless 24-bit Yes

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Vector Graphics

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http://en.wikipedia.org/wiki/ File:Virtual_Private_Network_over view.svg

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Icon Fonts

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http://fortawesome.github.com/ Font-Awesome/

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Seam Carving

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Energy

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Sound

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Amplitude

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Wavelength

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Interference

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Analog to Digital

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Sampling Rate

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Bitrate

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MP3

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PCM

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Psychoacoustics

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20 Hz - 20 kHz

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Frequency Masking

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Fast Fourier Transform

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Spectrogram

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Frames

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ID3

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Audio Formats

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Audio Formats • AAC • MIDI • MP3 • WAV • WMA

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Audacity

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3D Graphics

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Wireframe

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Polygon Mesh

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Subdivision

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http://www.subdivision.org/demos/ demos.html

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3D Scenes

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Clipping

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Culling

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Video

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Codecs

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Video Codecs

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Video Codecs • H.264 • Theora • VP8

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Containers

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Video Containers

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Video Containers • AVI • MKV • MP4 • MOV • Ogg • WebM

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Compression

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http://youtu.be/d1JA-nh0IfI

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Streaming

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Buffering

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Resolution

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Aspect Ratio

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Adaptive Bitrate Streaming

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GPUs

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http://youtu.be/-P28LKWTzrI

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http://youtu.be/mWUf-H1Qjd8

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Flash

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Problem Set 5

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http://www.cafepress.com/make/ personalized-gifts

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Computer Science E-1 Lecture 5: Multimedia