Videoconferencing – picture quality

VAVS Home Help 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.

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). Bear in mind particularly when playing a DVD that the picture quality at the Far End will be nowhere near the original due to these restrictions.

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.

Future Developments

Network improvements in 2011 and the progressive replacement of out-dated codecs (commenced 2012) now effectively support videoconferencing rates of up to 4Mbits/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.