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.

This application reads an ld-decode JSON metadata file, typically as produced by ld-process-vbi, and exports information in standard formats that other tools can read. At present, it can export:

• Per-frame signal quality information from the VITS test signals, as CSV
• Per-frame LaserDisc VBI control signals, as CSV
• LaserDisc navigation information, as Audacity labels
• LaserDisc navigation information, as FFMETADATA1 (which FFmpeg can use to add chapter navigation to a video file)
• Closed Captions, as SCC format (which tools like ttconv can read)

Syntax:

ld-export-metadata <options> <input>

Options:
  -h, --help                Displays help on commandline options.
  --help-all                Displays help including Qt specific options.
  -v, --version             Displays version information.
  -d, --debug               Show debug
  -q, --quiet               Suppress info and warning messages
  --vits-csv <file>         Write VITS information as CSV
  --vbi-csv <file>          Write VBI information as CSV
  --audacity-labels <file>  Write navigation information as Audacity labels
  --ffmetadata <file>       Write navigation information as FFMETADATA1
  --closed-captions <file>  Write closed captions as Scenarist SCC V1.0 format

Arguments:
  input                     Specify input JSON file