Convert SRT to MCC
Turn SRT subtitles into MacCaption MCC ancillary-data files — spec-complete CDP packets at 29.97 drop-frame, ready for HD broadcast workflows.
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up to 3 files · 10.2 KB each
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How to convert SRT to MCC
Convert SRT to MCC online. CutConvert encodes your SRT subtitles as a MacCaption MCC ancillary-data file — CEA-708 caption distribution packets carrying the CEA-608 caption track, the format HD broadcast delivery specs ask for.
Add your SRT file
Drag the .srt onto the drop zone. Cues are wrapped to the 32-column caption grid and encoded with the 608 character set.
Convert SRT to MCC
Press Convert. Every video frame gets a checksummed caption distribution packet — frame-rate code, sequence counters, CDP and SMPTE 291 checksums — at 29.97 drop-frame.
Download your result
Download the converted file instantly — or a single ZIP archive when you convert a batch of files.
SRT file and MCC broadcast captions, explained
MCC is the HD sibling of SCC: instead of raw 608 hex, it wraps caption data in the CEA-708 ancillary-data packets that broadcast servers ingest directly. This converter builds those packets the way MacCaption does — one CDP per frame, byte-run alias compression, both checksums — with the caption content carried on the CEA-608 compatibility track that standard broadcast workflows read. The encoding pipeline is verified against Comcast caption-inspector reference decodes of real broadcast MCC files.
Turn SRT subtitles into MacCaption MCC ancillary-data files — spec-complete CDP packets at 29.97 drop-frame, ready for HD broadcast workflows. 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.
SRT to MCC FAQ
What exactly does the MCC contain?
One CEA-708 caption distribution packet per frame at 29.97 fps drop-frame, carrying your captions as channel-1 pop-on CEA-608 data — the compatibility track every broadcast decoder reads. Native 708 service blocks (windows, pen styles) are not generated.
Is the output really spec-compliant?
Each line carries a complete SMPTE 291 ancillary packet: correct DID/SDID, CDP header with frame-rate code and sequence counters, cc_count padding, CDP checksum, and the trailing ANC checksum — the same structure as MacCaption output, validated against real broadcast files.
MCC or SCC — which does my delivery need?
Read the spec sheet: SD and legacy workflows usually ask for SCC; HD/file-based workflows increasingly ask for MCC. The caption content is the same either way, and CutConvert produces both from the same SRT.
Why is the MCC file so much bigger than my SRT?
MCC is a per-frame transport: every video frame gets a packet whether or not captions change, plus the mandatory format-description header. A 30-minute program is a few megabytes — that is normal for the format.
Is it free?
Free to try on short files (about 10 minutes of program). Full-length caption files need a one-time $7 pack or a paid plan — a fraction of desktop captioning software.
Guides for this workflow
- What is an MCC file?The HD caption delivery format decoded: caption distribution packets, checksums, MCC vs SCC, and the converters for both directions.Read guide
- SCC vs MCC vs STLThe broadcast caption decision table: how to tell which format your delivery spec is asking for, what differs under the hood, and one SRT to all three.Read guide
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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.