A presentation on the digital preservation of audiovisual materials, including a brief history of media formats and file types, among others. It's a bit of a rushed work, I admit, plus the text designs are not as smooth as before I converted the PPT to PDF format.

1. preserving
materials

2. what are
materials?

3. audiovisual
are surrogate

4. history

5. 2’’ Quad (1956)
TCR 100 Quad (1969)
UV 340 (1964)

6. Panasonic video cartridge (1969)
Philips video recorder (1970)
U-Matic(1971)

7. V-Cord (1972)
Betamax(1975)
VHS (1976)

8. D-2 (1988)Hi8 (1989)
Digital betacam(1993)

9. Digital –S (1995)

10. -2 (1988)
Hi8 (1989)Digital betacam(1993)

11. -2 (1988)
1992

12. -2 (1988)
1997 : RM

13. -2 (1988) VOBASF

14. 2001- present
OCGMP4
FLVMOV
MKV3GP

15. indigital

16. signal recording of a signal onto a carrier

17. digitization digital preservation of the digitized signal

18. via

19. you

20. computer
playback device video cassette recorder

21. LEFT: The Avid Dazzle Video Creator Plus HD ($89/P4500) captures video. RIGHT: Pinnacle’s Studio MovieBoxHD ($100/P5000) is a similar capture device.

22. LEFT: The Avid Dazzle Video Creator Plus HD ($89/P4500) captures video. RIGHT: Pinnacle’s Studio MovieBoxHD ($100/P5000) is a similar capture device.

23. LEFT: The Avid Dazzle Video Creator Plus HD ($89/P4500) captures video. RIGHT: Pinnacle’s Studio MovieBoxHD ($100/P5000) is a similar capture device.

24. LEFT: The Avid Dazzle Video Creator Plus HD ($89/P4500) captures video. RIGHT: Pinnacle’s Studio MovieBoxHD ($100/P5000) is a similar capture device.

25. LEFT: The Avid Dazzle Video Creator Plus HD ($89/P4500) captures video. RIGHT: Pinnacle’s Studio MovieBoxHD ($100/P5000) is a similar capture device.

26. properties

27. resolution-number of pixels present in the images of the video-determines whether your video is standard definition or high def.

28. size-pixel dimension of the frame

29. aspect ratio-Ratio of width to height

30. frame rates
-speed at which the frames are captured and intended for playback

31. bit rate-or data rate-amount of data used to describe the video portion of the file

32. bit rate-typically measured in per second units then in KB,MB,GB-higher bit rate, better quality (in general)

33. codec

34. properties

35. sampling rate-how often the audio is sampled when convertedfrom analog to digital

36. number of channelsEither coming from single (mono) or multiple channels (stereo)

37. codec

38. what is a

39. container VS
codec

40. Describes structure of the file

41. Short for coder/decoder
Compressor or decompressor
-Way of encoding video
into a stream of bytes
-Chief determinatorof quality

43. … Container as the file itself. Codec as its contents. Impt. to realize: -most good container formats can hold many codecs

44. Describe both!
Example:
MOV file containing H.264 data

45. Problem: Common use of terms Confusion and imprecision

46. Even more confusing:
-both describes codec and container
Example:
“mpeg-4”

48. Windows media video
-can be streamed across the internet
-when WM server: viewed before entire file
-windows media player
-internet streaming server

49. Audio video interleave
-Windows Player (ex. WMP)
-uncompressed: high quality video
-internet: entire file must be downloaded
-stored on local hard disk or CDROM

50. Apple QuicktimeMovie-Apple QuicktimeMovie Player-viewed before entire file-streamed across internet-depends on compression

51. Motion Picture Experts Group
-provide VHS quality movies or better
-MPEG player
-entire file must be downloaded

52. -
Mpeg1 = VHS
Mpeg2better than VHS; used for DVD
Mpeg4best quality

53. Real Media
-RealPlayer
-viewed before the file
-high compression but at a cost to quality

55. -makes a file smaller
-decoded file is unaltered after decompression has taken place
-by using a scheme known as “run length encoding”

56. Example: -Animation codec (which is typically used for archiving or transferring files), have a low compression ratio-Usually, it’s no more than 2:1.

57. -you lose some image, video, or audio information. -bit tricky because good lossycompression is a balancing act between quality, data rate/file size, colordepth, and fluid motion-Almost every video compression scheme is lossy

58. -Lossycompression schemes like H.264 (used on Canon video DSLRs) can have compression ratios of more than 100:1. -With video workflows, compression can be applied (or removed) at several stages.