[PR #1913] feat(input): Add native SCC (Scenarist Closed Caption) input support #2705

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claunia · 2026-01-29T17:23:30Z

claunia commented

2026-01-29 17:23:30 +00:00

Original Pull Request: https://github.com/CCExtractor/ccextractor/pull/1913

State: closed
Merged: Yes

Summary

Add native support for reading SCC (Scenarist Closed Caption) files directly, eliminating the need for external conversion tools like SCC2RAW.exe or Perl scripts.

New Rust parser module with SMPTE timecode parsing and CEA-608 hex pair extraction
Auto-detection of SCC format (with UTF-8 BOM handling)
New --scc-framerate option supporting 29.97 (default), 24, 25, 30 fps
Integration following the McPoodle DVD raw pattern

Closes #1293

Implementation Details

Files Added

src/rust/src/demuxer/scc.rs - Core SCC parser with 12 unit tests

Files Modified

Stream mode detection (C and Rust)
FFI exports (ccxr_is_scc_file, ccxr_process_scc)
Command line argument parsing
Integration in raw_loop()

Testing

Round-Trip Test

Verified caption preservation through the SCC format:

Extract CEA-608 captions from video to SRT (original)
Extract same video to SCC format
Convert SCC back to SRT (roundtrip)
Compare both SRT files

Result: 118/118 captions matched (100% accuracy)

=== Summary ===
Matching captions: 118/118 (100.0%)

Additional Tests

✅ Multiple output formats (SRT, WebVTT, transcript)
✅ Frame rate option (--scc-framerate 24)
✅ UTF-8 BOM handling
✅ All 260 Rust unit tests pass

Usage

# Basic usage
ccextractor input.scc -o output.srt

# With custom frame rate (for 25fps PAL content)
ccextractor input.scc --scc-framerate 25 -o output.srt

Test Plan

Round-trip test (video → SCC → SRT matches video → SRT)
Verify SRT output format
Verify WebVTT output format
Verify transcript output format
Test --scc-framerate option
Test UTF-8 BOM handling
Run Rust unit tests
Run full regression test suite

🤖 Generated with Claude Code

**Original Pull Request:** https://github.com/CCExtractor/ccextractor/pull/1913 **State:** closed **Merged:** Yes --- ## Summary Add native support for reading SCC (Scenarist Closed Caption) files directly, eliminating the need for external conversion tools like SCC2RAW.exe or Perl scripts. - New Rust parser module with SMPTE timecode parsing and CEA-608 hex pair extraction - Auto-detection of SCC format (with UTF-8 BOM handling) - New `--scc-framerate` option supporting 29.97 (default), 24, 25, 30 fps - Integration following the McPoodle DVD raw pattern Closes #1293 ## Implementation Details ### Files Added - `src/rust/src/demuxer/scc.rs` - Core SCC parser with 12 unit tests ### Files Modified - Stream mode detection (C and Rust) - FFI exports (`ccxr_is_scc_file`, `ccxr_process_scc`) - Command line argument parsing - Integration in `raw_loop()` ## Testing ### Round-Trip Test Verified caption preservation through the SCC format: 1. Extract CEA-608 captions from video to SRT (original) 2. Extract same video to SCC format 3. Convert SCC back to SRT (roundtrip) 4. Compare both SRT files **Result: 118/118 captions matched (100% accuracy)** ``` === Summary === Matching captions: 118/118 (100.0%) ``` ### Additional Tests - ✅ Multiple output formats (SRT, WebVTT, transcript) - ✅ Frame rate option (`--scc-framerate 24`) - ✅ UTF-8 BOM handling - ✅ All 260 Rust unit tests pass ## Usage ```bash # Basic usage ccextractor input.scc -o output.srt # With custom frame rate (for 25fps PAL content) ccextractor input.scc --scc-framerate 25 -o output.srt ``` ## Test Plan - [x] Round-trip test (video → SCC → SRT matches video → SRT) - [x] Verify SRT output format - [x] Verify WebVTT output format - [x] Verify transcript output format - [x] Test `--scc-framerate` option - [x] Test UTF-8 BOM handling - [x] Run Rust unit tests - [ ] Run full regression test suite 🤖 Generated with [Claude Code](https://claude.com/claude-code)

claunia added the pull-request label 2026-01-29 17:23:30 +00:00

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Reference: starred/ccextractor#2705