The entire wiki has been moved to a GitHub pages site: ld-decode documentation

The reason for this change is to both modernize the documentation and make it possible for anyone to update, change and correct the documentation through the standard GitHub PR mechanisms. If you are interested in contributing to the documentation please see the instructions available from the ld-decode documentation GitHub

The original wiki page below will be available until 2025-12-20. Do not update this wiki.

December 2022

• AC3 support! (special thanks to Staffan Ulfberg for figuring out the decoding and error correction, and Ian and Leighton Smallshire for the code here)
• Improved ld-analyze UI with more functionality, including a vectorscope
• cmake is now used, allowing builds on many more distributions
• Improvements to disk stacking
• Further improved EFM decoding with better filters and higher accuracy
• ld-process-efm is now a command line tool
• DTS decoding support
• Option for line-locked NTSC analog audio output
• Improved analog(ue) audio decoding quality (but CX still needs work)
• Lots (and lots and lots) of bug fixes

December 22nd 2019

• ld-decode processing speed greatly improved
• ld-decode and ld-decode tool multithreading support
• Direct support for compressed RF disc images in ld-decode
• Lots (and lots) of bug fixes
• Improved TBC
• NTSC Analog audio improvements
• PAL Analogue audio improvements
• PAL Transform chroma-decoder
• Many improvements to the chroma decoder
• New ld-analyse GUI with better UI and improved graphing
• Differential dropout detection
• Improved single-disc drop-out correction
• Greatly improved EFM decoding with better filters and higher accuracy
• Automatic disc mapping and metadata correction
• Improved wiki with more documentation

May 19th 2019

• Improved MTF handling in ld-decode
• EFM demodulation in ld-decode
• EFM digital audio decoding with JSON metadata production
• EFM data decoding (tested with Domesday LD-ROM discs) with JSON metadata production
• VITS (Vertical Interval Test Signal) metadata production in ld-decode
• VITS analysis in ld-analyse including SNR graph
• PAL and NTSC comb filter output dimensions now more ffmpeg friendly
• Support for keyboard shortcuts in ld-analyse
• Fixes (many!) to ld-decode and the tool-chain to improve both quality and robustness
• Drop-out correction support for NTSC discs with pull-down fields
• Improved ld-decode-tools MacOS support

January 28th 2019

Some of the many new features include:

• Accurate dropout detection in ld-decode using pre- and post-filtered decodes
• Improved dropout correction supporting inter-field replacement
• Intelligent line and sub-line video combination (combine video data from multiple disc sources)
• Improved NTSC 3D comb filter
• Improved YIQ to RGB colour-space conversion for NTSC
• Support for black and white only output from NTSC and PAL comb filters
• Capture quality metrics via VITS analysis
• CLV time code support in all post-processing tools
• Multiple improvements to both PAL and NTSC video and analogue audio decoding
• Improved VBI decoding now provides full IEC parameter support for both NTSC and PAL
• NTSC white-flag and 40-bit FM code decoding supported
• VBI auto-correction of time-code and frame number sequences as well as soundmode
• Analogue audio decoding improvements (better audio, more accurate timing)
• New JSON library for better handling of large JSON files (especially for more heavily damaged discs)
• Field order sequencing more robust with sync ‘confidence’ analysis
• Support for disc sources with reversed field order
• Support for non-standard discs with 90 degree colour burst offsets
• Support for NTSC and NTSC-J sources
• Termination and crash handling improved in ld-decode
• Multiple improvements to the ld-analyse GUI:
  • Faster comb filter previews,
  • Whole capture dropout analysis graphs,
  • Scalable video preview
  • Improved VBI analysis
  • Improved dropout analysis
  • Save frame preview as PNG
  • Dropout highlighting in line trace oscilloscope
  • …and many more minor fixes

• June 20th 2017 - Domesday Duplicator 3_0 released
• May 29th 2017 - Domesday Duplicator 2_2 released
• December 14th 2017 - Domesday Duplicator 2_0 released
• October 30th 2017 - First sample published from the Duplicator
• September 11th 2017 - First collaboration suggestion between ld-decode and Domesday86
• January 3rd 2017 - Domesday86.com website launched
• September 2016 - Much discussion about the need for better capture
• May 13th 2015 - First PAL images produced
• January 4th 2014 - First combined TBC and NTSC comb-filter
• November 2nd 2013 - Analog audio decoding starts working
• July 21st 2013 - First 'it's a dumb idea' response post
• April 30th 2013 - Project announced on lddb.com
• April 28th 2013 - Chad creates the ld-decode repo