computer science e-1cdn.computerscience1.net/2013/spring/lectures/5/lecture5.pdf · name extension...
TRANSCRIPT
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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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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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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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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