Migration from legacy vhs-decode builds

Legacy JSON metadata

The current version of Decode-Orc (and the ld-decode-tools Decode-Orc replaces) require TBC files with metadata in the current SQLite format (previously ld-decode used JSON rather than SQLite). Although older JSON metadata decodes will be accepted after a warning, they lack some of the newer fields used by Decode-Orc and may cause the tools to emit warnings about missing parameters.

If you have old decodes the recommended course of action is to re-decode the capture with a current version of ld-decode or vhs-decode. Do not rely on post-decoded files as preservation artifacts as the decoder functionality will vary over time and the post-decode artifact is not deterministic (TL;DR - re-decoding is preservation - keeping old TBC files is not).

Separate Y/C sources

Legacy versions of vhs-decode produced TBC Y/C pairs with the format <name>_chroma.tbc and <name>.tbc.

In order to use these files with Decode-Orc you will need to simply rename them. <name>_chroma.tbc should become <name>.tbcc and <name>.tbc should become <name>.tbcy. This is used by Decode-Orc to distinguish composite and separate sources when using features such as "quick project".