Caption conversion

Convert MCC to SCC

MacCaption 608/708 (MCC) to Scenarist Closed Caption (SCC). Convert in the web app, automate with the REST API, or run it offline with the CLI.

Convert MCC to SCC free How to convert

Converting MCC to SCC extracts the CEA-608 captions from a MacCaption file’s caption distribution packets and writes them as a standard Scenarist file. This is useful when a platform or encoder accepts only SCC, or when you need to review or edit the 608 track in tools that do not read MCC.

What carries over

CEA-608 caption data: text, control codes, positioning and styling
Caption modes: pop-on, roll-up and paint-on
Timing, converted to 29.97 fps SCC timecode

What changes

CEA-708 services and 708 window styling are not carried over, because SCC holds 608 only
An MCC timed at 23.976, 25 or 59.94 fps is re-timed to 29.97 fps SCC timecode
MCC header metadata, such as the UUID and creation program, is not part of SCC

How to convert MCC to SCC

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 .mcc file and select MacCaption 608/708 as the source profile.
Select Scenarist V1.0 as the target profile.
Review the recommended settings for this conversion.
Run the conversion and download your .scc file.

With the API

POST /jobs

curl -X POST https://api.closedcaptionconverter.com/jobs \
  -H "x-api-key: YOUR_API_KEY" \
  -F "source=@input.mcc" \
  -F 'config={
    "job_type": "convert",
    "source_profile": "MacCaption 608/708",
    "target_profile": "Scenarist V1.0",
    "target_frameRate": 29.97,
    "target_dropFrame": true
  }'

See API Getting Started for authentication and response handling.

With the CLI

Command line

ccconverter \
  --source input.mcc \
  --target output.scc \
  --source_profile "MacCaption 608/708" \
  --target_profile "Scenarist V1.0" \
  --target_frameRate 29.97 \
  --target_dropFrame true

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

Recommended settings

Source frame rate	Read from the MCC `Time Code Rate` header. Set it explicitly only if the header is wrong.
Target frame rate	29.97 fps, drop-frame, for standard SCC.

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

MCC to SCC questions

Only data SCC cannot store, which is CEA-708 services and 708-specific styling. The 608 captions convert exactly.

The converter calculates each caption’s real-time position and writes it as 29.97 fps timecode, so captions stay aligned with the same moments in the video.

Yes. See SCC to MCC, which is useful when a delivery requires 708 captions or a native frame rate.

Learn more about these formats

Source

MacCaption 608/708 (MCC)

What an MCC (.mcc) caption file is, how it carries CEA-608 and CEA-708 data at any broadcast frame rate, and how to convert MCC to SCC, SRT and more.

Target

Scenarist Closed Caption (SCC)

What an SCC (.scc) caption file is, how CEA-608 hex codes, 29.97 drop-frame timecode and pop-on/roll-up modes work, and how to convert SCC files.

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