A 263 file extension is related to H.263 video codec designed for low bitrate communication. A 263 file stores encoded video with h.263.

Detailed description

Software that works with 263 file extension

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263 file - H.263 encoded video

What is 263 file? How to open 263 files?

File type specification:

Digital video and movie file type icon Digital video and movie file type

The 263 file extension is associated with H.263 is a provisional ITU-T standard, it is due to be published sometime in 1995/1996. It was designed for low bitrate communication, early drafts specified datarates less than 64 Kbits/s, however this limitation has now been removed. It is expected that the standard will be used for a wide range of bitrates, not just low bitrate applications. It is expected that H.263 will replace H.261 in many applications.

The coding algorithm of H.263 is similar to that used by H.261, however with some improvements and changes to improve performance and error recovery. The differences between the H.261 and H.263 coding algorithms are listed below. Half pixel precision is used for motion compensation whereas H.261 used full pixel precision and a loop filter. Some parts of the hierarchical structure of the datastream are now optional, so the codec can be configured for a lower datarate or better error recovery. There are now four optional negotiable options included to improve performance: Unrestricted Motion Vectors, Syntax-based arithmetic coding, Advance prediction, and forward and backward frame prediction similar to MPEG called P-B frames.

H.263 supports five resolutions. In addition to QCIF and CIF that were supported by H.261 there is SQCIF, 4CIF, and 16CIF. SQCIF is approximately half the resolution of QCIF. 4CIF and 16CIF are 4 and 16 times the resolution of CIF respectively. The support of 4CIF and 16CIF means the codec could then compete with other higher bitrate video coding standards such as the MPEG standards.

This 263 file type entry was marked as obsolete and no longer supported file format.

This type of file is no longer actively used and is most likely obsolete. This is typically the case for system files in old operating systems, file types from long discontinued software, or previous versions of certain file types (like documents, projects etc.) that were replaced in higher versions of their original programs.

Updated: May 28, 2018

The default software associated to 263 file type:

VLC media player icon

VideoLAN Project Team logoVLC media player  Microsoft Windows software

Company or developer:
VideoLAN Project Team

Very popular multimedia player developed for Windows, Apple Mac, Linux, Unix and various other operating systems and platforms.

VLC can playback many of the video formats (AVI, MKV, OGV, WMV, ASF, MOV...) and audio formats (MP3, AAC, M4A, OGG, FLAC...) as well as support of subtitles for video. It can also be used as a streaming server and multimedia transcoder.

Help how to open:

Use compatible tools to playback *.263 files.

How to convert:

Probably can be exported to other video formats.

Related links:

H.261 player

List of recommended software applications associated to the .263 file extension

Recommended software programs are sorted by OS platform (Windows, macOS, Linux, iOS, Android etc.)
and possible program actions that can be done with the file: like open 263 file, edit 263 file, convert 263 file, view 263 file, play 263 file etc. (if exist software for corresponding action in File-Extensions.org's database).

  • Play 263 file

263 file players - programs that can play 263 file - H.263 encoded video

Programs supporting the exension 263 on the main platforms Windows, Mac, Linux or mobile. Click on the link to get more information about listed programs for play 263 file action.

Microsoft Windows:

Apple macOS / Mac OS X:

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261 file extension

File-Extensions.org > Digital video and movie file types

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