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Audio and Video Compression and it’s importance on the internet

Audio and Video Compression and it’s importance on the internet. Brian Dillinger May 3, 2010. What is compression?. A reversible conversion of data that requires fewer bits using codecs. Audio and Video Codecs.

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Audio and Video Compression and it’s importance on the internet

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  1. Audio and Video Compression and it’s importanceon the internet Brian Dillinger May 3, 2010

  2. What is compression? • A reversible conversion of data that requires fewer bits using codecs

  3. Audio and Video Codecs • A codec is a device or software that allows for COmpression and DECompression of video and audio

  4. Audio Standards MP3 • MP3 file format is the most common • With increased quality comes increased file size • CBR vs VBR • ID3 tagging through metadata

  5. Audio Standards FLAC • FLAC file format is most commonly used for lossless compression • High bitrate 768 kBit/s • Large file size • Song length of 4:31 • MP3 V0 9.12MB • FLAC 32.3MB

  6. Audio Compression Software • Exact Audio Copy (Powerful Accurate and FREE) • FLAC, WMV, MP3 and Ogg support • MP3 ripping capable of both VBR and CBR using Lame 3.98 • Free CD lookup • iTunes • MP3 and Apple Lossless • Apple Lossless has limited playback

  7. VIDEO Standards XviD • Standard Definition standard • Follows MPEG-4 part 2 standards • Lossy encoding • PAL video requires ~100GB per hour • Compressed at 200:1 XviD requires ~500MB per hour

  8. Video Standards H.264/x264 • Standard for High Definition video • Follows MPEG-4 part 10 standards • Allows for half the file size for the same video as XviD standards

  9. Video Compression Software • bitRipper • Very simple way to convert DVD video using the XviD codec and avi container • Adobe Encore • Expensive Professional Suite • Extremely fast and efficient • Voice to text for adding subtitles

  10. Why use compression? • Disc space is increasing but not infinite • Online streaming for both audio and video is a growing trend • Video conferencing and video chats

  11. References • www.xvid.org • www.hydrogenaudio.com • www.id3.org • www.flac.sourceforge.net • www.matroska.org/

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