Video Playback Considerations

The typical video application will have a playlist combined with either a popup or inline video player. Within the CloudTV HTML5 platform, all video must be positioned as follows:

  • <video> element must have a left that is a multiple of 16
  • <video> element must have a top that is a multiple of 16
  • <video> element must have a width that is a multiple of 16
  • <video> element must have a height that is a multiple of 16
This has to do with the way that MPEG video is encoded in macroblocks, being a multiple of 16 is required in order for video to be efficiently merged together with the other content in your application (buttons, text, images, etc).
 

How to load video

To load a video, use the standard HTML 5 video tag, or use JavaScript to set the src such as document.getElementById('video1').src = "http://www.someserver.com/my/video.mp4" :

<video src="http://www.someserver.com/my/video.mp4" id="video1" />

Video format guidelines

Video must meet some standard requirements to be playable within the CloudTV platform. The overall architecture provides just-in-time transcoding for videos loaded from remote servers. 

  1. Use MPEG or MPEG4 video for best quality transcoding.
  2. Do not use bitrates well above or well below the anticipated streaming bitrate, so if you are loading a 320x240 video, that should not be encoded at 20Mbps at the source.
  • Thursday, 03 November 2011
  • Posted in: Advanced
  • Number of Views: 2485

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