What Is an SCC File? Scenarist Closed Captions
What is an SCC file? The Scenarist Closed Captions format explained. Learn how SCC works, its structure, and how to convert SCC to SRT or VTT.
SCC (Scenarist Closed Captions) is a professional subtitle format used primarily in North American broadcast television. It stores CEA-608 closed captions as hexadecimal-encoded data, making it the standard delivery format for TV networks, streaming services, and post-production workflows that require FCC-compliant closed captions.
What Does SCC Stand For?
SCC stands for Scenarist Closed Captions, named after the Scenarist DVD authoring software that popularized the format. It was developed to carry CEA-608 (formerly EIA-608) closed caption data in a plain-text file. The format is mandated by the FCC for U.S. broadcast television and is widely used in the streaming industry for compliance with accessibility regulations.
How SCC Files Work
An SCC file encodes closed caption data as pairs of hexadecimal characters. Each line begins with a timecode in HH:MM:SS:FF format, followed by the caption data encoded in hex. The hex data contains control codes to position captions, switch channels, or send special characters, plus the actual text characters according to the CEA-608 standard. Because captions are position-aware, SCC can place text anywhere on screen and supports pop-on, roll-up, and paint-on display modes.
CEA-608 and the SCC Caption Standard
SCC and CEA-608 are related but not the same thing. CEA-608 (formerly EIA-608) defines the closed-caption data transmitted in analog Line 21: caption channels CC1 through CC4, text channels, display modes, positioning commands, and its limited character set. SCC is the plain-text delivery wrapper that stores those CEA-608 byte pairs with SMPTE timecodes. U.S. FCC rules define when captions are required; the caption file still has to meet the technical specification expected by your broadcaster or platform.
When to Use SCC
SCC is the right choice when you are delivering content to U.S. broadcast television, working with FCC compliance requirements, or interfacing with professional video servers and encoders that expect CEA-608 data. Major streaming platforms like Netflix, Amazon Prime Video, and Hulu also accept SCC as a delivery format. If your workflow involves television production, SCC is almost always required.
SCC File Structure
Scenarist_SCC V1.0 00:00:01:00 9420 9420 94ae 9420 9420 9452 97a2 e3 6c 6c 6f 80 00:00:04:00 9420 9420 94f2 9420 9420 97a2 a3 6f 72 6c 64 80
Advantages of SCC
- FCC-compliant for U.S. broadcast television delivery
- Supports positioned captions with pop-on, roll-up, and paint-on modes
- Carries CEA-608 data expected by professional encoders and servers
- Accepted by major streaming platforms for caption delivery
Limitations of SCC
- Not human-readable without specialized caption editing software
- Limited to the CEA-608 character set (no full Unicode support)
- Frame-based timecodes require knowing the exact video frame rate
- Primarily designed for English; non-Latin scripts need special handling
Players and Platforms That Support SCC
SCC Frequently Asked Questions
How do I open an SCC file?
SCC files are plain text, so you can open them in any text editor. However, the hex-encoded content is not human-readable without caption software. Use a dedicated caption editor like Telestream CaptionMaker or MacCaption to view and edit the decoded captions.
What is the difference between SCC and SRT?
SCC stores CEA-608 closed captions as hex-encoded data with frame-based timecodes and supports positioning and display modes. SRT is a simpler plain-text format with millisecond timecodes and no positioning. SCC is for broadcast delivery; SRT is for general video use.
Is SCC the same as CEA-608?
No. CEA-608 is the closed-caption encoding standard that defines channels, control codes, display modes, and the character set. SCC is a file format used to deliver CEA-608 data as hexadecimal pairs with frame-based timecodes. In short, SCC carries CEA-608 captions.
What is the SCC caption standard used for?
SCC is used to deliver CEA-608 closed captions to North American broadcast systems, playout servers, encoders, and platforms that require FCC-related caption compliance. It is a delivery format, not a general subtitle format, so many teams convert SCC to SRT or VTT for editing and review before creating a broadcast-safe output.
Why does my SCC file show wrong timing?
SCC timecodes are frame-based (HH:MM:SS:FF). If the frame rate in the SCC file does not match your video, captions will drift. Make sure you know the exact frame rate (23.976, 24, 25, 29.97, or 30 fps) when converting between SCC and other formats.
Can SCC files contain non-English text?
SCC uses the CEA-608 character set, which supports basic Latin characters, accented letters, and a limited set of symbols. It does not support full Unicode. For non-Latin languages, consider converting to SRT or VTT after delivery.