Convert MCC to SRT
Decode MacCaption MCC ancillary-data files into clean, timed SRT subtitles. Checksums validated, all documented frame rates supported.
Convert your files
Drop files here
Drag & drop or browse · MCC (MacCaption) caption filesConverted in your browser. Files never leave your device.About an hour of footage is free. Larger files: $3 each, or Pro $9/month for everything up to 50 MB.
up to 2 files · 5 MB each
free to start · project to project: $5 · every other conversion: $3 · Pro $9/month · pricing
Converting as a guest. A free account has no monthly cap on files within the free size limit.
How to convert MCC to SRT
Convert MCC to SRT online. CutConvert parses MacCaption MCC ancillary-data files: it 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.
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.
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.
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 $3 conversion 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
Convert a batch within your allowance and download a single ZIP, or one file if that is all you need.
Made for editors
Whole timelines from Premiere, Final Cut and Avid with transitions, markers, titles, keyframes, levels, nests and bins; captions that keep their italics, colour, placement and speakers across SRT, VTT, ASS, TTML, iTT, SCC and STL, any of them in, any of them out; transcripts into Premiere with the words the engine timed. Frame rates and timecode handled the way post expects.
Private by design
Files are converted in your browser. Queued files can be saved locally to restore your job after checkout. Conversion metadata helps us diagnose errors; file contents are not uploaded.
Questions, answered
Where are my files processed?
In your browser. The converter runs on your own machine and the file never leaves it; the site only records that a conversion happened. CutConvert never sees, stores, sells or shares your media.
Is it free? Do I need an account?
About an hour of footage per file is free, on every converter: 100 KB of subtitles or captions, 500 KB of Word transcript, 2 MB of transcript JSON, 1 MB of Resolve project, 5 MB of Final Cut XML, with Premiere projects and Avid AAF a little under the hour. Guests get five conversions a month, a free account has no monthly cap within those sizes, and above that project-to-project transfers are $5 per file. Every other conversion is $3, including project files to captions, reports or cut lists, and captions or transcripts into an editor. Pro is $9 a month ($90 a year) for every file type up to 50 MB; Studio is $19 a month ($190 a year) for files up to 500 MB. Paid-file access lasts 24 hours.
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 get that one file back, no ZIP. Tick extra formats under the output chips and the same ZIP carries every one of them, and a file counts as one conversion whatever it is written to.
Which formats are supported?
Timelines: Premiere .prproj, DaVinci Resolve .drp (as exported, or gzip- or Zstandard-wrapped), Avid AAF and Final Cut FCPXML in; FCP7 XML, FCPXML, Resolve .drp, CMX 3600 EDL and shot-list CSV out. A Premiere or Final Cut edit travels with its transitions, markers, titles, opacity and scale keyframes, clip volume, speed changes, nested sequences, bins, audio channel routing and each file's own frame rate, wherever the output has a place for them; an Avid AAF brings its transitions, markers, clip levels with their keyframes, muted tracks, nested stacks and each clip's own rate. Captions and transcripts, read and written: SRT, WebVTT, SBV, ASS, TTML, DFXP, iTT, SCC, MCC (a second 608 channel comes out as its own file), EBU-STL, Avid caption TXT, CapCut drafts of any size, timed CSV, Word, plain text, Whisper, WhisperX, AssemblyAI, Deepgram, Rev.ai and CapCut JSON, TwitchDownloader chat logs as a chat replay, Premiere transcript JSON and .prtranscript, Rev, Otter and Word-style transcripts, with italics, colour, placement and speakers kept where the output can hold them and measured word timing into Premiere. EDLs become event CSV reports. The capability table lists what every pair keeps.
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.