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2023-11-19T22:27:32Z

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{{FormatInfo
|formattype=electronic
|subcat=Disk Image Formats
|extensions={{ext|lds}},{{ext|raw}},{{ext|ldf}}
}}

'''Domesday Duplicator''' captures raw [[Laserdisc]] data using a custom FPGA board attached to the player.

It allow high-quality back-ups of the analogue information contained on the laserdiscs by bypassing most of the 30-year-old electronics in the players. Direct RF sampling also allows all information on the LaserDiscs to be stored (unlike conventional RGB sampling of the video output). Since AIV LaserDiscs are a combination of video, pictures, sound and data (as well as numerous VBI streams), direct RF sampling is the preferred method of preservation.

* .lds (Laser Disc Sample) - '10-bit packed unsigned data', smallest possible file size for captures.
* .raw - '16-bit signed scaled data', uses more disk space but is directly compatible with sample editors such as Audacity and is therefore useful when setting up, testing a capture system or analysing results from a capture.
* .ldf - an .lds that's been FLAC compressed with ld-compress

.ldf represents raw LaserDisc RF captured at 40 Million Samples Per Second (MSPS) with each sample being 10-bits.

Lower sample rates and other bit-depths such as 8-bit & 16-bit are possible

== Links ==
* [https://github.com/simoninns/DomesdayDuplicator/wiki/User-Guide Domesday Duplicator User Guide]
* [https://www.domesday86.com/ Domesday86 Project]
* [https://github.com/happycube/ld-decode ld-decode]
* [https://github.com/happycube/ld-decode/blob/main/scripts/ld-compress ld-compress]
* [https://github.com/happycube/ld-decode/wiki/File-formats Format description]
* [https://github.com/happycube/ld-decode/wiki/Disc-images-to-download Sample images]
* [https://www.youtube.com/watch?v=QDlbwl3f39Q Domesday Duplicator - Ultimate LaserDisc Preservation - Tech Tangents] - Youtube video

Domesday Duplicator - Revision history

Parchivist: Created page with "{{FormatInfo |formattype=electronic |subcat=Disk Image Formats |extensions={{ext|lds}},{{ext|raw}},{{ext|ldf}} }} '''Domesday Duplicator''' captures raw Laserdisc data us..."