Common Media LibraryShared libraries for web video players

TypeScript implementations of CMCD, CMSD, ISO BMFF, captions, DRM, C2PA, and more. Maintained by the Streaming Video Technology Alliance.

Browse packages

The CML mark

Spec-accurate
Each package implements one specification. No invented extensions.
Tree-shakeable
Import one function and ship only that function.
Typed
Union and literal types guide autocomplete. Incorrect usage fails at compile time.
Peer dependencies stay inside CML
No framework, no runtime, no polyfills.

Packages

Delivery

Containers

Captions

Trust

Core

Who uses CML

Players and tools that build on these packages.

hls.jscml-cmcd, cml-id3, cml-structured-field-values, cml-utils
dash.jscml-608, cml-cmcd, cml-cmsd, cml-dash, cml-id3, cml-request, cml-xml
Shaka Playercml-cmcdPorts the CMCD code from CML into its own source.
Video.jscml-cmcdUses CML in its spf package.
Eyevinn warp-playercml-608, cml-iso-bmff
moq-dev hangcml-iso-bmff

Community

DiscordAsk questions and meet the maintainers.
GitHub DiscussionsLonger threads and proposals.
SVTA Players and Playback groupThe working group that oversees the project.
Contributing guideHow to report a bug or open a pull request.