Choosing the Right Codec - A Practical Guide to Video and Audio Compression - page 183

Table 8-3 Coding Formats for Different Applications

Description Potential coding formats

DVD MPEG-2, H.264

DVD-ROM MPEG-1, MPEG-2, H.264

Offline DVCAM, DV

CD-ROM MPEG-1, MPEG-2, MPEG-4 part 10, Sorenson, H.264

Internet - dialup MPEG-1, H.264, Sorenson, Real Networks, Windows Media

Internet broadband MPEG-2, H.264, Flash, Windows Media, Real Networks, Sorenson

Video conferencing H.261, H.263, H.264, H.320, H.323 and H.324

Mobile devices H.264

(3GPP & 3GPP2)

Table 8-4 Video Conferencing Standards Recommended by the ITU

Standard Category Description

G.72x Audio The ITU standards for audio compression.

H.261 Video An ITU standard for videoconferencing video streams. H.261

uses the Discrete Cosine Transform (DCT) algorithm to
compress video to fit within a bandwidth of 64 Kbps to 2 M bps.

H.263 Video Another ITU video conferencing standard, that offers better

compression than H.261. This is particularly well suited to
compression down to the low bit rate available through
dial-up modems.

H.264 Video The telecommunications companies are experimenting with this

codec for delivery of video content to mobile phones. For this
application the codec must be used in a low latency real-time
encoding mode.

H.320 Integration A higher bit rate ITU standard for videoconferencing via ISDN

or through a reserved portion of the bandwidth available on a
T1 connection.

H.323 Integration This is an ITU standard for videoconferencing that takes place

over networks that don't guarantee an available bandwidth. The
Internet is such a network where the traffic may be transferred
in bursts and must be interleaved with traffic following
completely different point-to-point connections. Compliant
implementations must also support H.261 video content.

H.324 Integration An ITU standard that describes video conferencing taking place

over standard telephone lines with modems.