4   multimedia elements - video
Upcoming SlideShare
Loading in...5
×
 

4 multimedia elements - video

on

  • 3,676 views

 

Statistics

Views

Total Views
3,676
Views on SlideShare
3,193
Embed Views
483

Actions

Likes
0
Downloads
48
Comments
0

4 Embeds 483

http://www.itmulti.info 468
http://pmonline.parramarist.nsw.edu.au 10
http://www.weebly.com 4
http://edge.quantserve.com 1

Accessibility

Categories

Upload Details

Uploaded via as Microsoft PowerPoint

Usage Rights

© All Rights Reserved

Report content

Flagged as inappropriate Flag as inappropriate
Flag as inappropriate

Select your reason for flagging this presentation as inappropriate.

Cancel
  • Full Name Full Name Comment goes here.
    Are you sure you want to
    Your message goes here
    Processing…
Post Comment
Edit your comment

4   multimedia elements - video 4 multimedia elements - video Presentation Transcript

  • Video
    Analog Vs Digital
    http://cbdd.wsu.edu/kewlcontent/cdoutput/TR502/page8.htm
    Video combines pictures and sounds displayed over time. Video (as opposed to animation) starts with a continuous event and breaks it up into frames, whereas an animation starts with frames.
  • Video Formats
    Video formats are made up of:
    the container
    the codec(s) used inside that container.The container describes the structure of the file: where the various pieces are stored, how they are interleaved, and which codecs are used by which pieces.  It may specify an audio codec as well as video.A codec ("coder/decoder") is a way of compressing the file to decrease file size, while maintaining quality
  • Examples
    Video Formats (Containers)
    AVI (.avi)
    Quicktime
    WMV (.wmv)
    Video Codecs
    MPEG(Moving Pictures Expert Group)
    RM (Real Media)
    DivX
  • Comparison of Codecs
  • Video Processing
    Analog signals (pictures and audio) are converted to digital signals via a video capture card
    A video or animation is made up of frames: individual pictures that are put together to create the illusion of movement.
  • Video
    Video files are very large, which is an important factor in deciding what hardware to use to store the video files.
    Speed is an issue in video and animation…the frame rate is the number of frames per second that are shown
    Higher frame rate = higher quality, smoother video= more file size needed
  • Frame rates
  • Calculations
    File size in Kb of a 30 minute Simpson’s episode at 24 frames per second.
  • How many frames are there?
    Number of frames=frame rate x time in seconds
  • File size of each frame
    Each frame is 2048 by 872 pixels and a bit depth of 8
  • File Size for the episode
    Number of frames x File size of each frame
  • Why is this important?
    BECAUSE file size will effect the requirements of a system for primary and secondary storage
    Higher file size = greater storage requirements
    Higher file size = greater primary memory requirements (bigger, faster computer)
  • Video – File Types
    MPEG (The Moving Picture Experts Group)
    The MPEG standards consist of different Parts. Each part covers a certain aspect of the whole specification. MPEG has standardized the following compression formats and ancillary standards:
  • Video – File Types
    AVI
    Audio Video Interleave, is a multimedia container format introduced by Microsoft in November 1992 as part of its Video for Windows technology. AVI files can contain both audio and video data in a file container that allows synchronous audio-with-video playback. Like the DVD video format, AVI files support multiple streaming audio and video, although these features are seldom used.
  • Video – File Types
    MP4
    MPEG-4 (1998): Coding of audio-visual objects. MPEG-4 uses further coding tools with additional complexity to achieve higher compression factors than MPEG-2. In addition to more efficient coding of video, MPEG-4 moves closer to computer graphics applications. In more complex profiles, the MPEG-4 decoder effectively becomes a rendering processor and the compressed bitstream describes three-dimensional shapes and surface texture. MPEG-4 also provides Intellectual Property Management and Protection (IPMP) which provides the facility to use proprietary technologies to manage and protect content like digital rights management.
    MPEG-4 is a multimedia container format. It is most commonly used to store digital video and digital audio streams, especially those defined by MPEG, but can also be used to store other data such as subtitles and still images. Like most modern container formats, MPEG-4 Part 14 allows streaming over the Internet.
  • Video
    video editing:
    import/export
    transitions
    Titles
    special effects, eg:
    twisting
    zooming
    rotating
    slow motion
    time lapse
    distorting
    synchronising sound
    filters:
    colour balance
    brightness
    contrast
    blurring
    morphing
    This will be done in class with video software