The following article will briefly discuss video codecs (coder-decoder) algorithms that are suitable for video conferencing applications.
H.261 (also known as Px64) This symmetric real-time codec was specifically developed as a standard for video conferencing. Bandwidth is usually a multiple of 64 kbit / sec. It gives a low quality picture though and is optimized for only static scenes without too much motion in the video. It uses strong interframe compression.
H.263 This is a newer standard and was developed after the H.261 videoconferencing codec. In comparison with the H.261, its image quality is improved and works best with motion compensation and provides a higher coding rate. H.263 was providing a good compression even for low speed 28.8 Kbps modems. Its algorithm is used in MPEG standards (including bi-directional coding).
MPEG-4 video codec is essentially a modification of H.263. This format has a limited resolution . MPEG-4 is Included in the standard distribution of Windows and Mac OS (beginning with QuickTime 3.0).
H.323/H.324 This are the newest standards for video conferencing, which use codecs in the form of plug-ins that allow the user to choose whatever is in his system.
A good video conversion software such as avs4you supports the newest codecs and can also convert between any video format. Here is an avs4you coupon if you are interested to buy this software package.
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