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Article Type: Definition

Fragmented MP4 (fMP4)

Fragmented MP4 (fMP4) is an MP4 container with its media logically partitioned into moof-mdat pairs (fragments). fMP4 can be one .mp4 file (all fragments) streamed using byte-range requests to the .mp4 file or many .m4s files (one per fragment) streamed using regular requests for each .m4s file.

Encoded Bitrate

Encoded Bitrate is the bitrate of the compressed (i.e. during ABR encode/transcode) audio or video media objects, each Bitrate level representing different quality levels in ABR. The concept of Encoded Bitrate is inherent in various ABR-related definitions: e.g. CMCD br key, e.g. HLS Playlist Variant Stream BANDWIDTH parameter, e.g. DASH . . . Read more

Common Media Server Data (CMSD)

Common Media Server Data (CMSD) is a CTA standard (CTA-5006) published in 2022 defining how Origins and CDNs send status information to downstream workflow nodes (e.g. CDNs, players) with every object response.

Common Media Client Data (CMCD)

Common Media Client Data (CMCD) is a CTA standard (CTA-5004) published in 2020 defining how player clients send playout and error status information to upstream workflow nodes (e.g. CDNs) with every object request.

Common Media Application Format (CMAF)

Common Media Application Format (CMAF) is an Apple-Microsoft standard aiming to simplify workflows by defining concurrent use of multiple ABR methods (e.g. DASH, HLS) while using one set of audio and video media files.