Caption conversion

Convert DFXP to SRT

Distribution Format Exchange Profile (DFXP) to SubRip Subtitle (SRT). Convert in the web app, automate with the REST API, or run it offline with the CLI.

Convert DFXP to SRT free How to convert

Converting DFXP to SRT strips a TTML-based caption file down to plain text and timing, for players, editors and tools that do not read XML captions. The converter resolves every TTML timing expression (clock time, frames or ticks) into SRT milliseconds and turns <br/> elements and nested spans into clean lines.

What carries over

Caption text and line breaks
Italics, bold and underline from tts:fontStyle, tts:fontWeight and tts:textDecoration
Timing, resolved from any TTML time expression to milliseconds

What changes

Regions and positioning are dropped
Colors, backgrounds and font settings are removed
Captions shown simultaneously in different regions become overlapping SRT cues. Enable Fix overlap to merge them
Document metadata and language attributes are not stored

How to convert DFXP to SRT

The same conversion engine powers all three, so a job you set up in the web app produces identical output from the API or CLI.

In the web app

Sign in to the web app, or start a free trial.
Upload your .dfxp file and select Distribution Format Exchange Profile as the source profile.
Select SubRip Video Subtitle Script as the target profile.
Review the recommended settings for this conversion.
Run the conversion and download your .srt file.

With the API

POST /jobs

curl -X POST https://api.closedcaptionconverter.com/jobs \
  -H "x-api-key: YOUR_API_KEY" \
  -F "source=@input.dfxp" \
  -F 'config={
    "job_type": "convert",
    "source_profile": "Distribution Format Exchange Profile",
    "target_profile": "SubRip Video Subtitle Script",
    "fix_overlap": true
  }'

See API Getting Started for authentication and response handling.

With the CLI

Command line

ccconverter \
  --source input.dfxp \
  --target output.srt \
  --source_profile "Distribution Format Exchange Profile" \
  --target_profile "SubRip Video Subtitle Script" \
  --fix_overlap true

The CLI runs fully offline on macOS, Windows and Linux. See the CLI docs for every flag.

Recommended settings

Source frame rate	Only matters if the DFXP uses frame-based times. It is read from `ttp:frameRate` when present.
Fix overlap	Recommended when the DFXP uses multiple regions.

Format-specific options are covered in Encoding & Decoding Options and Profiles & Formats.

DFXP to SRT questions

For the text and timing, yes. Styling and positioning are lost because SRT cannot represent them.

Yes. Tick-based times are converted using the document’s ttp:tickRate.

Use DFXP for .dfxp files and generic TTML for other TTML documents. For files from a specific platform, use the matching profile, such as Netflix DFXP. See TTML to SRT.

Learn more about these formats

Source

Distribution Format Exchange Profile (DFXP)

What a DFXP (.dfxp) caption file is, how it relates to TTML, where DFXP is still required, and how to convert DFXP to SRT, WebVTT, SCC and more.

Target

SubRip Subtitle (SRT)

What an SRT (.srt) subtitle file is, its timing and numbering rules, supported tags and encoding, and how to convert SRT to SCC, WebVTT, EBU-STL and more.

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