Digital Video

Representing video

• An array of images

• Movie = video + audio

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

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)

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

Video Standards

• Digital video– MPEG– Quicktime– AVI

• PAL - European standard– More lines, better color

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

Starting Premiere

• Select the resolution and rate for your work

Pieces of PremiereProject whereclips are collected

Timeline

Monitorwhere you watch

Tools

Import• Bringing clips into the project

– Movie clips– Audio files (from CoolEdit or elsewhere)

Creating a movie

• Drag clips onto the Timeline

• DEMO

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

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