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Digitizing Audio and Video for Digital Libraries
- 1. Digitizing and Delivering Audio and Video Jon Dunn Jenn Riley IU Digital Library Program Digital Library Brown Bag Series February 11, 2005
- 5. Typical Audio/Video Workflow Editing/cleaning possible Source Master file Digitization/ Encoding Compressed derivative files for delivery Transcoding
- 9. Digital Audio: Sampling audio sampling quantization noise Barlow, Multimedia Systems , p. 77.
- 13. Audio Compression: Masking Effect Barlow, Multimedia Systems , p. 73.
- 15. MPEG-1 Audio Compression From the MPEG Audio FAQ http://www.tnt.uni-hannover.de/project/mpeg/audio/faq/
- 21. Digital Video Basics 4:2:2 sampling 4:2:0 sampling 4:1:1 sampling 4:2:2 – High End DV (Digital Betacam, DVCPro50) 4:2:0 – MPEG 1 & 2 4:1:1 – DV and DVCAM
- 43. Video E-Reserves Access eres password UITS Streaming Servers eres password course number
Notas do Editor
- All formats have audio as well, of course
- Green can be computed from Brightness (Luminance), Red, and Blue information.
- Y, R, and B are not stored for every pixel 4:2:2 sampling: Y on every pixel, R+B on every other 4:2:0 sampling: Y on every pixel, each of R and B on every fourth pixel 4:1:1 sampling: Y on every pixel, R+B on every fourth pixel
- Reiterate that codec != format != player
- Mention time it took to convert content
- Used both MPEG-4 (QuickTime) and RealVideo in part to help avoid player problems