Digital Video Basics


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  • The recording and editing of sound has long been in the domain of the PC, but doing the same with moving video has only recently gained acceptance as a mainstream PC application. In the past, digital video work was limited to a small group of specialist users, such as multimedia developers and professional video editors, who were prepared to pay for expensive and complex digital video systems. It was not until 1997, after several years of intense technological development, that the home PC was up to the job. It has also helped that many video editing software packages have become affordable or, in some cases, even free.
    N matter how you plan to present your files, this is the most the Web can handle.
    Video can be stored in many different formats.
    The AVI Format
    The AVI (Audio Video Interleave) format was developed by Microsoft.
    The AVI format is supported by all computers running Windows, and by all the most popular web browsers. It is a very common format on the Internet, but not always possible to play on non-Windows computers.
    Videos stored in the AVI format have the extension .avi.
    The Windows Media Format
    The Windows Media format is developed by Microsoft.
    Windows Media is a common format on the Internet, but Windows Media movies cannot be played on non-Windows computer without an extra (free) component installed. Some later Windows Media movies cannot play at all on non-Windows computers because no player is available.
    Videos stored in the Windows Media format have the extension .wmv.
    The MPEG Format
    The MPEG (Moving Pictures Expert Group) format is the most popular format on the Internet. It is cross-platform, and  supported by all the most popular web browsers.
    Videos stored in the MPEG format have the extension .mpg or .mpeg. MP4 technology works by compressing the files, making the overall size much smaller, in a similar way to that of MP3 technology, although much more advanced and complex. The introduction of MP3s made music and audio files more accessible to the consumer and MP4s are set to do the same for the video market. t is a video format meant for digital streaming over the internet
    The QuickTime Format
    The QuickTime format is developed by Apple.
    QuickTime is a common format on the Internet, but QuickTime movies cannot be played on a Windows computer without an extra (free) component installed.
    Videos stored in the QuickTime format have the extension .mov.
    The RealVideo Format
    The RealVideo format was developed for the Internet by Real Media.
    The format allows streaming of video (on-line video, Internet TV) with low bandwidths. Because of the low bandwidth priority, quality is often reduced.
    Videos stored in the RealVideo format have the extension .rm or .ram.
    The Shockwave (Flash) Format
    The Shockwave format was developed by Macromedia.
    The Shockwave format requires an extra component to play. This component comes preinstalled with the latest versions of Netscape and Internet Explorer.
    Videos stored in the Shockwave format have the extension .swf.
    All swf's have a frame limit. once you hit that limit the movie stops cold turkeyflv does not have frame limits. so it is ideal for long movies, broadcast etc. FLV, as a Flash video format, is also very popular on the web. You can always see the videos on the website like YouTube, Google Video, MySpace TV. Full-motion video,
    Go no bigger than 320 x 240 pixels at 10 frames per second.
  • Video is measured by the horizontal pixel dimension by the vertical pixel dimension, e.g., 320x240
    640x480 (720x480 non-square pixels like DV) is referred to as "full frame"
    The greater the frame size, the wider the pipeline must be in order for the movie to play smoothly.
  • The random access and nonlinear fashion in which you can compose a word document is similar to the processes in using desktop nonlinear editors for video and audio.
    Tape-to-Tape editing was a linear process (although under computer control). If a section in the middle of a program needed to be changed or replaced, the entire tape had to be re-edited from the new insertion point. With nonlinear editors, you can copy, paste, rearrange, and output the new version to tape or compress it for Web distribution.
  • It is important to select the appropriate settings to optimize your video for the desired distribution method. Settings such as video dimensions, file size, and file format are important when creating a videoResulting lecture should be no more than about 15 minutes in length. Longer lectures The shorter your video sequence, the smaller the
    resulting file size will be. Try making multiple clips using Camtasia Recorder.
    One method to minimize file size is to limit the size of the application window being captured.
    It's a fairly safe assumption that most people are now running at 800x600 or better. The video should
    be small enough to be completely displayed on the screen without scaling, and still have room for the
    player window frame and controls.
    • As a general rule, never record a larger area of the screen than necessary. Recording unnecessary
    screen area, aside from the aforementioned considerations, also results in larger file sizes, reduced
    capture frame rates, and in some cases can cause playback problems on slower systems.
  • Digital Video Basics

    1. 1. Tools to produce digital video Digital Camcorders Digital Cameras (with video capabilities)
    2. 2. Digital Video: File Formats .MPEG4 .MOV .WMV .AVI (not for web) .RM or .RAM . FLV: flash video  .SWF
    3. 3. Video File Size Data rate for every second of the movie (measured in fps: frame per second) Duration of the movie (measured in seconds) Video dimension Compression and Codec (Formats) The quality and compression of the audio track.
    4. 4. Digital Video: Video Editors The most popular video editing software Window Movie Maker (free on Windows) iMovie (free on Mac) Final Cut Pro Adobe Premiere QuickTime Pro Camtasia Studio
    5. 5. Video Editor  Video editing is Nonlinear editing 1. Capture 2. Edit video and audio in the timelines  Titles  Transitions  Effects  Still images  Narration  Music 1. Save or export to one of the web video format
    6. 6. Digital Video: Add video to web <embed src=“” width=320 height=240 autoplay=false controller=true pluginspage=" me/download/”> The “pluginspace” tag will prompt the user to download the player if they do not already have it.
    7. 7. Recommended guidelines Limit the length of the videos within 15 minutes. Dimensions: 640x480 maximum. .mp4 for web video format. Provide printable formats, caption or transcripts for your video.
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