H.263v2 (H.263+) H.263v2 (also known as H.263+, or as the 1998 version of H.263) is the informal name of the second edition of the ITU-T H.263 international video coding standard. It retained the entire technical content of the original version of the standard, but enhanced H.263 capabilities by adding several annexes which can substantially improve encoding efficiency and provide other capabilities (such as enhanced robustness against data loss in the transmission channel). The H.263+ project was ratified by the ITU in February 1998. It added the following Annexes: Annex I – Advanced INTRA Coding mode Annex J – Deblocking Filter mode Annex K – Slice Structured mode 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 Annex S – Alternative INTER VLC mode Annex T – Modified Quantization mode H.263v2 also added support for flexible customized picture formats and custom picture clock frequencies. As noted above, the only picture formats previously supported in H.263 had been Sub-QCIF, QCIF, CIF, 4CIF, and 16CIF, and the only picture clock frequency had been 30000/1001 (approximately 29.97) clock ticks per second.
H.263v2 (H.263+) H263v2 (also known as H.263+, or as the 1998 version of H.263) is the informal name of the second edition of the ITU-T H.263 international video coding standard. It retained the entire technical content of the original version of the standard, but enhanced H.263 capabilities by adding several annexes which can substantially improve encoding efficiency and provide other capabilities (such as enhanced robustness against data loss in the transmission channel). The H.263+ project was ratified by the ITU in February 1998. It added the following Annexes: Annex I !– Advanced INTRA Coding mode Annex J – Deblocking ?Filte:r mode Annex K – Slice Structured mode 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 Annex S – Alternative INTER VLC mode Annex T – Modified Quantization mode H.263v2 also added support for flexible customized picture formats and custom picture clock frequencies. As noted above, the only picture formats previously supported in H.263 had been Sub-QCIF, QCIF, CIF 4CIF, and 16CIF, and the only picture clock frequency had been 30000/1001 (approximately 29.97) clock ticks per second