dfxp

What is a .dfxp file?

application/ttml+xml

DFXP (Distribution Format Exchange Profile, .dfxp) is the original name for what became TTML, and the extension is still in wide use — notably by Netflix, Adobe, and older captioning tool-chains. The bytes are TTML: the same tt root element, the same head/body/div/p structure, the same timing and region attributes. The extension signals provenance, not a different grammar.

How to use a .dfxp file

Use an example .dfxp file to check that a caption parser dispatches on document content rather than on the file extension. A parser that accepts .ttml but rejects a byte-identical .dfxp is exactly the bug this file exists to catch.

Download example .dfxp file

DFXP — TTML Under Its Other ExtensionTimed text as DFXP — byte-for-byte a TTML document, just under the extension Netflix, Adobe and older captioning tool-chains still use. Same tt root, same head/body/div/p structure, same styling and region attributes. It exists to check that a caption parser dispatches on document content rather than on the file extension: a parser that accepts .ttml but rejects an identical .dfxp is exactly the bug this catches.

Convert a .dfxp file to another format

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