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Post-production file converter

Convert MCC to SRT

Decode MacCaption MCC ancillary-data files into clean, timed SRT subtitles — checksums validated, all documented frame rates supported.

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browseMCC (MacCaption) caption files

up to 3 files · 10.2 KB each

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How to convert MCC to SRT

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

  1. Add your MCC file

    Drag the .mcc onto the drop zone. V1.0 and V2.0 headers and all documented timecode rates (24, 25, 30, 30DF, 50, 60, 60DF) are supported.

  2. Convert MCC to SRT

    Press Convert. Each line’s ancillary packet is checksum-validated, the 608 caption pairs are extracted from the CDPs, and the caption state machine rebuilds display and erase timing.

  3. Download your result

    Download the converted file instantly — or a single ZIP archive when you convert a batch of files.

MCC caption file and SRT subtitles, explained

An MCC file is a frame-by-frame dump of broadcast caption packets — hex data wrapped in aliases, 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. Decoding is verified against Comcast caption-inspector’s reference decodes of real broadcast MCC files — 96 of 96 captions matched exactly.

Decode MacCaption MCC ancillary-data files into clean, timed SRT subtitles — checksums validated, all documented frame rates supported. 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 — the track that carries the captions in standard broadcast workflows. Files with native-708-only captions (rare) would decode empty; a warning notes when 708 service data is present.

What frame rates are supported?

All rates 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?

Every line’s SMPTE 291 checksum is verified; lines that fail are skipped and counted in a warning instead of corrupting 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 same engine used by the SCC converter and verified against reference decodes.

Is it free?

Free to try on short files. MCC is a per-frame format, so even a few minutes of program is a sizable file — full-length files need a one-time $7 pack or a paid plan.

Guides for this workflow

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Why editors trust it

Free to start

Convert everyday batches for free. Create an account when you need large, high-volume jobs.

Batch in, one ZIP out

Drop up to 10 files at once and download a single tidy ZIP — or one file if that is all you need.

Made for editors

EDL, SRT, Avid caption TXT, and Premiere transcript JSON — with speakers, frame rates, and timecode handled the way post expects.

Secure by default

Files are encrypted in transit, converted on managed infrastructure, and never sold or shared.

Questions, answered

Where are my files processed?

Your files are uploaded over an encrypted (HTTPS) connection and converted on CutConvert’s servers, then handed straight back to you as a download. We never sell or share your media.

Is it free? Do I need an account?

Small, everyday batches are free to convert. For large or high-volume jobs you’ll create an account and upgrade — which keeps the free tier fast for everyone.

What do I get when I convert multiple files?

Drop several files and you get back one ZIP archive containing every converted file. Convert a single file and you simply get that one file — no unnecessary ZIP.

Which formats are supported?

You can convert EDL to CSV; SRT and VTT subtitles to each other and to plain text; SRT, TXT, and DOCX/DOC transcripts to Premiere Pro transcript JSON; SRT to Avid Media Composer caption TXT; and Premiere Pro .prtranscript exports to SRT, VTT, or text — with speaker labels preserved. More post-production formats are on the way.

Can I pick a frame rate?

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