Videoconferencing – picture quality

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Videoconferencing – picture quality

What picture quality does videoconferencing deliver?

The videoconferencing systems at JCU are set up with the ability to deliver two concurrent video streams, one of the presenter and one of the presentation while receiving one stream (far end view).

Bandwidth & Resolution

Click here for a table showing the relationship between bandwidth and resolution

Presenter

The presenter camera stream is provided by a camera pointed at the presenter. The quality of this video stream is dependent upon the camera hardware, videoconference codec compression techniques and available bandwidth, delivering a video quality of the presenter, ranging from good to excellent.

Presentation

The source of the presentation can be a computer file (power point presentations are not uncommon), a DVD disc, VHS tape (being phased out) or a document camera/visualizer view. This video stream is referred to as the duo video or second video stream and is in some rare cases due to videoconferencing hardware and projectors, restricted to the XGA screen resolution (1024 x 768 pixels). However the good news is that these restrictions are slowly being removed as VAVS progressively is replacing the ‘older’ codecs and cameras with HD capable devices thereby bringing videoconferencing to the high definition stage.

Bear in mind particularly when showing a DVD as the presentation, the picture quality at the Far End will be nowhere near the original due to the restrictions outlined above.

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Future Developments

Ongoing network improvements and the progressive replacement of out-dated codecs now effectively support videoconferencing rates of up to 6Mbits/sec in all the videoconference enabled JCU meeting rooms. Connecting two Cisco C-series endpoints equipped with high definition cameras, results in a picture quality of 1080p@30fps in other words, true high definition.