Release highlights

ld-decode revision 7

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

ld-decode revision 6

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

ld-decode revision 5

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

ld-decode revision 4

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

Other notable dates

• 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