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Figure 19. Typical MEPG-2 Picture Sequence Showing Picture Types
Since the anchor frame is sent only intermittently, and only changes are sent for
the intervening frames, significant bandwidth savings can be realized, with
minimum degradation of picture quality. It should be noted, however, that
response time may be unacceptably affected in some situations when using full
IPB compression. This can be remedied by using just I and P frames, resulting
in similar delays to M-JPEG but requiring much less bandwidth.
4.6.1.4 Audio Compression
The MPEG-2 system multiplex layer allows for various audio compression
standards to be used, and the definition of a standard compression scheme
ensures compatibility between vendors. In comparison, M-JPEG does not include
an audio standard. Audio is transmitted separately from the video.
4.6.1.5 MPEG Summary
MPEG-2 is superior to M-JPEG because of its ability to multiplex and to
synchronize, to interpret motion and to provide improved compression, and to
transport multiple different audio compression data streams.
Table 4 on page 52 provides a convenient comparison of the two technologies.
Chapter 4. IBM 8285 ATM Modules 51