Appendix A. Video Codec Standards
Chapter 3, “Fundamentals of Video Compression,” covered the basic principles of video coding algorithms. This appendix describes the details of four standard codecs: H.261, H.263, H.264, and MPEG-4, Part 2.
H.261 Compression Standard
The H.261 codec was developed by the ITU (International Telecommunications Union). H.261 is a legacy codec used for only two purposes:
H.323 requires that video endpoints support the H.261 format.
H.261 provides interoperability with legacy endpoints.
Table A-1 shows the video frame parameters for H.261.
Table A-1. Video Format for H.261
Video Parameter | Parameter Options |
|---|---|
Interlace-specific coding ... |
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