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H.263 is a video compression standard originally designed as a low-bit-rate compressed format for videoconferencing. It was standardized by the ITU-T Video Coding Experts Group (VCEG) in a project ending in 1995/1996. It is a member of the H.26x family of video coding standards in the domain of the ITU-T. 

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H.263 is a video compression standard originally designed as a low-bit-rate compressed format for videoconferencing. It was standardized by the ITU-T Video Coding Experts Group
(VCEG) in a project ending in 1995/1996. It is a member of the H.26x
family of video coding standards in the domain of the ITU-T.

Like previous H.26x standards, H.263 is based on discrete cosine transform (DCT) video compression.H.263 was later extended to add various additional enhanced features in
1998 and 2000. Smaller additions were also made in 1997 and 2001, and a
unified edition was produced in 2005.

Block Diagram of the H.263 Video Codec

The first version of H.263 supported a limited set of picture sizes:

• 128x96 (a.k.a. Sub-QCIF)

• 176x144 (a.k.a. QCIF)

• 352x288 (a.k.a. CIF)

• 704x576 (a.k.a. 4CIF)

• 1408x1152 (a.k.a. 16CIF)

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.

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.

Thanks.

A video codec standard originally designed as a low-bitrate compressed format for videoconferencing. It has been widely adopted as the standard for video streaming over mobile networks.

Standard image sizes specified by H.263 include SQCIF (128 x 96 pixels), QCIF (176 x 144), and CIF (352 x 288) resolutions.

H.263 handles only the visual part of a video stream, the audio is encoded using audio encoders such as AMR.