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Post-production file converter

Convert MCC to SRT

Decode MacCaption MCC files into timed SRT subtitles. Checksums are validated and all documented frame rates work.

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browseMCC (MacCaption) caption filesConverted in your browser. Files never leave your device.About an hour of footage is free. Bigger files: $3 a file, or Pro.

up to 2 files · 5 MB each

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Converting as a guest. A free account has no monthly cap within the free size cap.

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How to convert MCC to SRT

Convert MCC to SRT online. CutConvert parses MacCaption MCC ancillary-data files and decodes the caption track into numbered SRT subtitles. It expands the byte-run aliases, checks every packet checksum and walks the CEA-708 caption distribution packets.

  1. Add your MCC file

    Drag the .mcc onto the drop zone. The converter reads V1.0 and V2.0 headers and every documented timecode rate: 24, 25, 30, 30DF, 50, 60 and 60DF.

  2. Convert MCC to SRT

    Press Convert. The converter checks each line's ancillary packet checksum and pulls the 608 caption pairs from the CDPs. The caption state machine then rebuilds display and erase timing.

  3. Download your result

    Download the converted file, or one ZIP when you convert a batch.

MCC caption file and SRT subtitles, explained

An MCC file is a frame-by-frame dump of broadcast caption packets. The hex data is wrapped in aliases and unreadable without a real decoder. This converter runs the full chain: alias expansion, SMPTE 291 checksum validation, CDP section parsing, and a CEA-608 state machine for the caption track. We tested it against Comcast caption-inspector's reference decodes of real broadcast MCC files, and 96 of 96 captions matched exactly.

Decode MacCaption MCC files into timed SRT subtitles. Checksums are validated and all documented frame rates work. It is free to start, encrypted in transit, and converts a whole batch into one ZIP — sign in when you need large, high-volume jobs.

MCC to SRT FAQ

Which caption track is decoded?

The CEA-608 field-1 compatibility track inside the CDPs, which carries the captions in standard broadcast workflows. Files with only native 708 captions are rare and would decode empty. A warning notes when 708 service data is present.

What frame rates are supported?

Every rate the MCC format documents: 24 (23.976), 25, 30, 30DF (29.97 drop-frame), 50, 60 and 60DF. Timing is converted at the exact pull-down rates, so SRT times land on the right milliseconds.

What happens with corrupt lines?

The converter checks every line's SMPTE 291 checksum. Lines that fail are skipped and counted in a warning, so they can't corrupt the output.

Does it handle roll-up news captions?

Yes. The shared 608 state machine decodes pop-on, roll-up and paint-on styles. The SCC converter uses the same engine, verified against reference decodes.

Is it free?

Free to try on short files. MCC stores a packet per frame, so even a few minutes of program makes a sizable file. Full-length files need a one-time $3 conversion or a paid plan.

Guides for this workflow

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Questions, answered

Where are my files processed?

In your browser. The file never leaves your computer, and CutConvert only records that a conversion happened. We never see, store, sell or share your media.

Is it free? Do I need an account?

Files up to about an hour of footage convert free on every converter. CapCut projects are free up to 500 KB. Guests get five conversions a month; a free account has no monthly cap within the free size caps. Bigger files are $3 each, or $5 for a project conversion from one program to another. Pro is $9 a month ($90 a year) for files up to 50 MB. Studio is $19 a month ($190 a year) for files up to 500 MB.

What do I get when I convert multiple files?

One ZIP with every converted file. A single file comes back on its own. Press + to add more output formats: they go in the same ZIP, and each file still counts as one conversion.

Which formats are supported?

Projects in: Premiere .prproj, DaVinci Resolve .drp, Avid AAF and bins, Final Cut FCPXML, CapCut drafts and Audition sessions. Projects out: FCP7 XML, FCPXML, Resolve .drp, AAF, CapCut and REAPER, plus CMX 3600 EDL and shot-list CSV. Transitions, markers, titles, keyframes, levels, speed changes and nested sequences carry over wherever the target app can hold them. Captions: SRT, WebVTT, SBV, ASS, TTML, DFXP, iTT, SCC, MCC, EBU-STL, Avid caption TXT, timed CSV, Word and plain text. Transcripts: Whisper, WhisperX, AssemblyAI, Deepgram, Rev.ai and CapCut JSON, Premiere transcript JSON and .prtranscript, and Rev, Otter and Word-style text. Styling, placement and speakers come along where the output supports them.

Can I pick a frame rate?

Yes. For EDL and Avid caption output, choose 23.976, 24, 25, 29.97 or 30 fps, or let CutConvert detect it from your source.