video help

[nymph4]

H264 is for video encoding but what is H263p

Is it an Old verson and what is the p   for

[Salmon Trout]

H.263 is a video compression standard originally designed as a low-bitrate compressed format for videoconferencing. It was developed by the ITU-T Video Coding Experts Group (VCEG) in a project ending in 1995/1996 as one member of the H.26x family of video coding standards. P is one of the annexes to the H263 standard. It covers reference picture resampling. H263 is often used in phones.

http://en.wikipedia.org/wiki/H.263

[nymph4]

I thought the   p   was for  Pragrasive scan

[Salmon Trout]

I thought the   p   was for  Pragrasive scan

If you mean "progressive", then, no, the P in H263P, H263 P, H263(P) H263-P or h263p does not stand for that. Since the original ratification of H.263 in March 1996[12] (approving a document that was produced in November 1995), there have been two subsequent additions which improved on the original codec by additional optional annexes (extensions). For example, the H.263v2 added a deblocking filter via Annex J.

The original H.263 specified the following annexes:

    * Annex A - Inverse transform accuracy specification
    * Annex B - Hypothetical Reference Decoder
    * Annex C - Considerations for Multipoint
    * Annex D - Unrestricted Motion Vector mode
    * Annex E - Syntax-based Arithmetic Coding mode
    * Annex F - Advanced Prediction mode
    * Annex G - PB-frames mode
    * Annex H - Forward Error Correction for coded video signal

In March 1997, an informative Annex I describing Error Tracking — an encoding technique for providing improved robustness to data losses and errors, was approved to provide information for the aid of implementers having an interest in such techniques.

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
    * Annex X - Profiles and levels definition