H236各个版本的区别总结

H.263 versions

H.263
# Annex A - Inverse transform accuracy specification
# Annex B - Hypothetical Reference Decoder
# Annex C - Considerations for Multipoint
# Annex D - Unrestricted Motion Vector mode (无限制运动质量模式)
# Annex E - Syntax-based Arithmetic Coding mode (以及基于句法的算术编码模式(SAC))
# Annex F - Advanced Prediction mode (高级预测模式)
# Annex G - PB-frames mode
# Annex H - Forward Error Correction for coded video signal (前向纠错编码)
# Annex I - Advanced Intra Coding with Alternate VLC
# Annex J - Deblocking Filter

H.263v2 (H.263+ or H.263 1998)
# Annex I - Advanced INTRA Coding mode
# Annex J - Deblocking Filter mode
# Annex K - Slice Structured mode ( Slice结构 )
# Annex L - Supplemental Enhancement Information Specification
# Annex M - Improved PB-frames mode
# Annex N - Reference Picture Selection mode
# Annex O - Temporal, SNR, and Spatial Scalability mode
# Annex P - Reference picture resampling
# Annex Q - Reduced-Resolution Update mode (see implementors'guide correction as noted below)
# Annex R - Independent Segment Decoding mode (独立分割解码)
# Annex S - Alternative INTER VLC mode
# Annex T - Modified Quantization mode

H.263v2 specified a set of recommended modes in an informativeappendix (Appendix II, since deprecated):
|Level 1|Level2 |Level 3
Advanced INTRA Coding | Yes | Yes | Yes
Deblocking Filter | Yes | Yes | Yes
Supplemental Enhancement Information (Full-Frame FreezeOnly) | Yes | Yes | Yes
Modified Quantization | Yes | Yes | Yes
Unrestricted Motion Vectors | No | Yes | Yes
Slice Structured Mode | No | Yes | Yes
Reference Picture Resampling (Implicit Factor-of-4 ModeOnly) | No | Yes | Yes
Advanced Prediction | No | No | Yes
Improved PB-frames | No | No | Yes
Independent Segment Decoding | No | No | Yes
Alternate INTER VLC | No | No | Yes
|Level 1|Level 2|Level3

H.263v3 (H.263++ or H.263 2000)
# Annex U - Enhanced reference picture selection mode (增强的参考图像选择)
# Annex V - Data-partitioned slice mode (数据分割)
# Annex W - Additional supplemental enhancement information specification (增强的补充信息)
# Annex X (originally specified in 2001) - Profiles and levels definition