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Provision of video

by rcooper — last modified Jun 11, 2010 05:32 AM

(R) Provision of video

Video sharing service/YouTube. Perhaps the easiest and most user friendly way to view videos, is to upload them to the video sharing service, YouTube. YouTube takes care of the file conversion by accepting many video formats including: WMV, AVI, MOV, and FLV. The advantage of using YouTube is that you do not have to worry about converting the movie format yourself and you do not host the video or worry about bandwidth charges. Users may then click and play the video on your website even though the video is stored on YouTube. YouTube limits uploaded videos to 2 GB or 10 minutes in length.

Inserting videos into websites based on IW:LEARN's Toolkit is straightforward. Upload the video to YouTube, then copy the docid from Youtube (e.g. -1645948007344467936 for this particular video - http://video.google.com/googleplayer.swf?docId=-1645948007344467936), then add Google video content in the Toolkit and insert the latter code into the 'docId' field of Google video content (edit tab).

How to upload YouTube videos: http://www.google.com/support/youtube/bin/answer.py?hl=en&answer=57924

Videos can be an important form of visual communication with users and can provide them with a sense of environmental ambience that the written word cannot always do. For example, the experience of watching a speech by a high-ranking policy maker and reading the speech are quite different. The video will show body language and inflection of speech that often reveals more information than the text itself. Videos also can enhance appreciation of the seriousness of an issue, such as water scarcity or lack of sanitation, in a way that words cannot.

Popular formats for Windows-based PC's are Windows Media Viewer (WMV) and Audio Video Interleave (AVI) because the Windows Media Player that is built into the Windows operating system supports them. For Macintosh computers, the QuickTime Movie format (MOV) is a good choice because Apple’s QuickTime Player supports this format. A Windows version of QuickTime is also available. The various formats’ advantages and disadvantages usually involve image quality and file size. If not using an existing video sharing service, and because a variety of video formats are available, it is good practice to make a video file available in a number of common formats for downloading by the user.

Viewing videos on the web browser. An alternative to downloading videos to be viewed offline is to watch them through the Web browser. The Adobe Flash Video (FLV) format may be used on most browsers by downloading a small, free Adobe Flash Player plug-in.

Digital video consists of a sequence of photographic images shown at about 30 frames (images) per second (fps). Full resolution video and audio utilizes enormous amounts of data storage making it impractical, at least for the moment, to use on websites. It is possible to stream video continuously in real time to the desktop but this requires significant data processing power and bandwidth to work smoothly. To be practical, a video clip is usually is compressed, according to a variety of different algorithms, and the audio track down sampled and reduced from stereophonic to monophonic sound. Finally, the video is shown at 15 fps, giving the image a slightly jerky look.

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