Digital Video

1
Digital Video
2
Representing video

• An array of images
• Movie video audio

3
How big is a movie

• Frames (pictures) per second
• 32 FPS faster than human eyes
• 24 FPS - OK
• 10 FPS - a little jerky
• How big is a frame
• This screen 1024x768
• TV - 640 x 480

4
How big?

• 640 x 480 x 10 minutes
• 307,200 x 600 sec x 32 fps
• 5.9 billion pixels x 3 (RGB)
• 17 billion pixels
• Audio - 48000 x 10 min x 60 sec/min x 2
• 58 million bytes
• Compression (reduce the size)

5
Video Standards

• NTSC - American Television
• Mostly black and white with a little color added
• 460x360
• VHS - video tapes
• Cheat a lot on the color
• 300x360
• DVD - 720x480
• HDTV - High definition TV
• 1920x1080

6
Video Standards

• Digital video
• MPEG
• Quicktime
• AVI
• PAL - European standard
• More lines, better color

7
Basic video editing in Premiere

• Project
• A collection of clips and cuts of audio and video
• Import
• Bringing in clips
• Tools
• Timeline
• Select
• Razor
• Export Timeline
• Generate an edited movie

8
Starting Premiere

• Select the resolution and rate for your work

9
Pieces of Premiere
10
Import

• Bringing clips into the project
• Movie clips
• Audio files (from CoolEdit or elsewhere)

11
Creating a movie

• Drag clips onto the Timeline
• DEMO

12
Editing

• Razor tool
• Cuts clips into two pieces so that each can be
  used independently
• Select
• Select and moves a clip
• Delete key
• Removes clips from the time line

13
Timeline

• How does the timeline relate to the video and
  audio array?
• Each point on the timeline corresponds to an
  index in each of the arrays
• Not necessarily the same index