Video

Using video  Carefully planned, well-executed video clips can make a dramatic difference in a multimedia project  Use video only when all other methods (text, still images) are not enough; don’t use it just because it’s possible

Obtaining video clips  Shoot your own clips  Buy footage; this can be a nightmare since the licensing rights and permission may be difficult to obtain  On some projects you have no choice but to pay the price for required footage  Example: Istockphoto Example: Istockphoto

Video compression  A codec is the algorithm used to compress a video for delivery and then decode it in real-time for fast playback  All popular codecs employ lossy compression algorithms  Popular codecs: MPEG, Divx, RealVideo, DVI/Indeo, Cinepak

Typical filename extensions  avi - Audio Video Interleave  mp4 - MPEG-4 Part 14 or MP4 file format  mkv & mka - Matroska Multimedia Container  mpg & mpeg - Moving Picture Experts Group  flv - Flash Video  wmv, wma & asf - Advanced Systems Format  mov - Apple Quicktime Movie  3gp - 3GPP Multimedia File  vob + ifo - Video Object & DVD Information File Wikipedia: Comparison of Container Formats

Use of video in multimedia  Good video is illustrative  Use static video, near shots  Less than 1 min clips  Video is confirming and makes mental images  Divide long video into clips with interactivity

Animation

Computer animation  Computer animation programs typically use layers, keyframes and tweening techniques  These methods are commonly used also with traditional animations that are done without computers  You can usually set your own framerate, but the rate at which changes are computed and screens actully refreshed will depend on the power of your display platform and hardware  The smaller the object, the faster it can move

Animation file formats  Some file formats are designed specially for animations; they can be often ported among applications and platforms  Popular animation formats: 3D Studio Max (.max), Windows Audio Video Interleave (.avi), Machintosh Quicktime (.mov), Motion Video (.mpg), Flash (.swf)

Video vs. animation  Video includes something that is real; an animation has no limits  When to choose video, when animation?  metria/skiaskopia/ metria/skiaskopia/