Is the SRT to SCC converter free?

Yes, completely free with no sign-up, no watermarks, and files up to 50 MB each. All processing happens in your browser, so your subtitle files are never uploaded to a server.

What frame rate should I use for SCC?

The converter maps timestamps to 29.97 fps frame values in HH:MM:SS:FF timecodes. It does not generate drop-frame timecode metadata; verify the timecode convention required by your recipient.

How does SCC handle the FCC captioning mandate?

The FCC requires closed captions on much US broadcast and online video content, but generating an SCC file alone does not prove compliance. Use the output as part of a workflow that meets the applicable captioning rules and delivery specification.

Can I convert SRT to SCC for Spanish captions?

The broader SCC/CEA-608 ecosystem has character sets for multiple languages, but this converter emits basic printable ASCII only. Spanish accented characters and en-yen are replaced with ?, so review or preprocess non-English text before conversion.

Are SCC files editable in text editors?

SCC files are plain text but contain hexadecimal byte pairs that are not human-readable. While you can open an SCC file in a text editor, you need specialized tools like Mac Caption, CaptionMaker, or InqScribe to edit captions meaningfully.

What is the difference between SCC and CEA-708?

SCC encodes CEA-608 (analog Line 21) captions. CEA-708 is the newer digital television caption standard used in ATSC broadcast. For modern digital broadcast delivery, you may need CEA-708 captions in addition to or instead of SCC.

How large are SCC files compared to SRT?

SCC files are typically similar in size to SRT files or slightly larger. Each caption cue is encoded as a series of hexadecimal byte pairs (4 characters each), so file size depends on the number of cues and characters.

Does SCC support italic text?

SCC can represent some CEA-608 styling controls, but this converter does not map SRT italic formatting to them. Text is emitted as plain pop-on caption content.

Can I batch convert multiple SRT files to SCC?

Yes. Drop several SRT files on this page and they open together in the workspace Batch tool with the SCC format pre-selected, converting every file at once. For converting whole folders at scale, use the Batch Converter page.

Absolutely. All conversion happens client-side in your browser. No subtitle data, file contents, or metadata is ever transmitted to a server.

What file extension does SCC use?

SCC files use the .scc extension, which is recognized by US broadcast systems, caption authoring tools (Mac Caption, CaptionMaker), and video editing software like Adobe Premiere Pro and Avid Media Composer.

How are special characters handled in SCC?

This converter supports basic printable ASCII. Accented characters, symbols, and other Unicode text outside that range are replaced with ?. Review non-English output before delivery.

What are SCC channel assignments (CC1, CC2, CC3, CC4)?

CEA-608 defines four caption channels: CC1 (primary English), CC2 (secondary language, often Spanish), CC3 (alternate primary, often used for secondary audio), and CC4 (alternate secondary). The converter defaults to CC1 for English captions.

Can SCC files be used for streaming video?

SCC is primarily for broadcast television. For streaming platforms (Netflix, Hulu, Amazon), sidecar caption files in SCC format are sometimes accepted, but IMSC (TTML) or WebVTT are more commonly required. Check your platform's delivery specifications.

SRT to SCC (CEA

Encode SubRip subtitles into basic Scenarist Closed Captioning pop-on captions.

Drag & drop your SRT file here

or click to browse

Supports .srt files up to 50 MB

Core Engine Architecture

Free Online SRT to SCC Converter

Our SRT to SCC converter encodes plain-text SubRip subtitles into Scenarist Closed Captioning format, which is widely used in North American broadcast caption workflows. The converter transforms supported basic ASCII text into hex-encoded CEA-608 byte pairs, converts SRT timestamps (HH:MM:SS,mmm) to SMPTE timecodes (HH:MM:SS:FF at 29.97fps), inserts pop-on caption control codes, and adds the required Scenarist_SCC V1.0 header. Review the output before professional caption delivery.

Payload & Syntax Inspector

SRT to SCC Code Syntax & Structure Inspection

Side-by-side code inspection illustrating header definitions, timestamp syntax, and cue payload formatting

Millisecond Sync

input.srt

SRT SOURCE

1
00:00:01,000 --> 00:00:04,000
Hello, world!
 
2
00:00:04,500 --> 00:00:08,000
This is a subtitle file.
 
3
00:00:08,500 --> 00:00:12,000
Converted locally!

output.scc

SCC RESULT

Scenarist_SCC V1.0
 
00:01:00	9420c8e5ececef2c20f7eff2ec64a180942f
00:04:00	942c
00:04:15	94205468e97320e973206120737562f4e9f4ece520e6e9ece5ae942f
00:08:00	942c
00:08:15	942043ef6e76e5f2f4e56420ecefe361ecec79a1942f
00:12:00	942c

Specification Sheet

SRT vs SCC Technical Specifications

Standard Compliant

Input Format

SRT

SRT (SubRip) is the most universally supported subtitle format. Each entry has a sequential index number, a timestamp line in HH:MM:SS,mmm --> HH:MM:SS,mmm format (comma before milliseconds, arrow separating start and end), and subtitle text. SRT files are plain text and recognized by virtually every media player, smart TV, video editor, and streaming platform.

Output Format

SCC

SCC (Scenarist Closed Captioning) is a long-standing format for delivering closed captions to North American broadcast television and some streaming workflows. SCC files encode CEA-608 (Line 21) caption data as hexadecimal byte pairs, paired with SMPTE timecodes in HH:MM:SS:FF format (hours:minutes:seconds:frames at 29.97 fps). The file starts with a header line (Scenarist_SCC V1.0) followed by timecode-tab-data triplets. Because caption text is hex-encoded, SCC files are not human-readable without a decoder.

Format Differences

SRT stores text as readable UTF-8 characters; SCC encodes text as hexadecimal byte pairs.

SRT uses HH:MM:SS,mmm timestamps; SCC uses SMPTE timecodes HH:MM:SS:FF at 29.97fps.

SRT has no file header; SCC requires the Scenarist_SCC V1.0 header on the first line.

SRT entries are numbered sequentially; SCC entries are identified by their timecode position.

SRT has no caption mode; SCC uses pop-on, roll-up, or paint-on modes encoded via control codes.

SRT supports the full Unicode character set; SCC is limited to the CEA-608 character table (mostly ASCII with limited accents).

Conversion Troubleshooting & Gotchas

Practical solutions for player compatibility, character encoding, and timing synchronization

4 Common Gotchas

GOTCHA #1

Subtitle timing drifts or appears out of sync on media players

Video files frequently differ in framerate (e.g., 23.976 fps vs 25 fps). If the timing drifts steadily, use our Subtitle Sync tool to adjust the global offset or framerate stretch.

GOTCHA #2

Characters appear as garbled symbols or question marks (Mojibake)

Legacy files saved in Windows-1252, Shift-JIS, or GBK may render incorrectly. Our exporter standardizes output to clean UTF-8. Use our Subtitle Encoding Converter if the source file is corrupted.

GOTCHA #3

Overlapping captions when multiple speakers talk simultaneously

Different formats handle overlapping dialogue differently. If your target player cannot render stacked cues cleanly, open the file in our Subtitle Editor to adjust individual cue timings.

GOTCHA #4

Video editing software (Premiere, DaVinci, Final Cut) rejects the file

Professional NLE software enforces strict syntax rules. Our converter eliminates malformed line breaks and non-standard tags, producing clean, standardized files.

Features

Encodes supported basic ASCII text into CEA-608 hexadecimal byte pairs

Converts cue line breaks to spaces in the caption data

Converts SRT timestamps (HH:MM:SS,mmm) to SMPTE timecodes (HH:MM:SS:FF at 29.97fps)

Inserts CEA-608 pop-on caption control codes for proper display

Adds the required Scenarist_SCC V1.0 file header

Marks unsupported Unicode characters with ? in the ASCII caption stream

Outputs basic .scc pop-on caption files for SCC-aware workflows

Why Convert?

SCC is commonly used for closed caption delivery to North American broadcast workflows.

Streaming delivery specifications vary; check whether your platform currently accepts SCC.

Professional captioning workflows in the US television industry use SCC as the standard interchange format.

Broadcast automation systems and playout servers read SCC but not plain-text SRT.

FCC rules govern closed captioning for applicable programming; final compliance requires delivery-specification checks.

SCC preserves frame-accurate timing at 29.97fps, the NTSC broadcast standard.

Converting from SRT provides a basic SCC starting point for caption workflows that require review.

Scenarios

Common Use Cases

Broadcast Caption Delivery

Produce SCC files from SRT subtitles for delivery to television networks, cable operators, and broadcast playout systems that require CEA-608 captioning.

Streaming Platform Delivery

Generate SCC when a streaming platform explicitly accepts it, and confirm the current delivery specification.

FCC Caption Context

Create SCC as part of a caption-compliance workflow; professional delivery requires final specification checks.

Broadcast Automation

Feed subtitle content into broadcast automation and playout systems that read SCC format but cannot import plain-text SRT files.

Caption Archival

Store subtitle content in the broadcast-standard SCC format for long-term archival in professional media asset management systems.

Captioning Pipeline

Integrate SCC encoding into subtitle production pipelines where SRT is used for editing and SCC is required for final delivery.

Format Ecosystem

Related Formats

SRT (SubRip)

The input format: universal plain-text subtitles readable by all media players and editors.

VTT (WebVTT)

The web alternative: if you also need web-ready captions, convert SRT to VTT in parallel with SCC.

STL (Spruce Subtitle)

The Spruce text alternative: use SRT to STL for workflows that expect Spruce STL rather than SCC.

How It Works

1
Upload your .srt file by dragging it into the converter or browsing.
2
The parser reads each SRT entry: index, timestamp, and text.
3
Supported basic ASCII characters are encoded into CEA-608 byte pairs; unsupported characters become ?.
4
SRT millisecond timestamps are converted to 29.97fps SMPTE timecodes.
5
Pop-on caption control codes are inserted, and the Scenarist header is prepended.

moreTools.fromFormat

SRT LRC SRT VTT SRT SBV SRT ASS SRT TXT SRT TTML SRT STL SRT SMI

moreTools.toFormat

VTT SCC ASS SCC LRC SCC SBV SCC SSA SCC TTML SCC STL SCC SMI SCC

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Frequently Asked Questions

Yes. This converter encodes plain-text SRT subtitles into Scenarist Closed Caption (.scc) files adhering to CEA-608 broadcast standards, complete with SMPTE 29.97fps timecodes and pop-on caption control codes.

SRT stores subtitle text as readable plain text with human-readable timestamps. SCC encodes caption data as hexadecimal byte pairs (like 9152 91ae 9120 9120) that represent CEA-608 control codes and characters. The converter translates between these fundamentally different encoding systems.

SRT timestamps (HH:MM:SS,mmm) are converted to SCC timecodes in HH:MM:SS:FF format, where FF is the frame number at 29.97 fps. Millisecond precision is quantized to the nearest represented frame within the second.

SCC (Scenarist Closed Captions) is a standard format for Line 21 closed captioning used in North American broadcast television. It encodes caption data as hexadecimal byte pairs that map to CEA-608 caption commands. Individual networks and delivery systems define their current intake requirements.

CEA-608 (formerly EIA-608) is the North American standard for Line 21 television closed captions. SCC files encode CEA-608 commands including pop-on, paint-on, and roll-up caption modes, channel selection (CC1-CC4), and character sets for English, Spanish, and French.

SCC supports three CEA-608 caption modes: Pop-On (captions appear as complete blocks), Paint-On (characters appear one by one), and Roll-Up (captions scroll up line by line). The converter defaults to Pop-On mode, which is closest to how SRT cues display.

Ready to convert your subtitles?

Drop your SRT file here and convert to SCC instantly.

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