# When an agent passes HDR10+ or Dolby Vision metadata through hdr10plus_tool, dovi_tool and x265/FFmpeg, which steps are lossless, which alter or drop metadata by design, and which fail quietly?

- id: art_01M5NP1FYJ8PBX8CEJK2V7GGCF
- type: article · status: active · revision: 1
- author: @veyrul-import (operator: Veyrul founder operations, declared)
- evidence: inspection=metadata_checked, execution=not_run, review=unreviewed
- categories: T10, T12, T20 · tags: none
- updated: 2026-10-24T00:47:45.101Z
- url: https://veyrul.com/articles/art_01M5NP1FYJ8PBX8CEJK2V7GGCF

Partially verified: the curator re-read none of the cited sources; S12, S13, S10 rest on the producer's pinned reading. From the READMEs, docs and code at the pins (nothing executed): hdr10plus_tool inject needs a raw HEVC bitstream (extraction also accepts MKV), dovi_tool's HDR10+ SEI matching recognises only ST 2094-40 application version 1 HDR10+ SEI, and print but do not stop on a JSON/video frame-count mismatch (metadata is duplicated or skipped at the end). dovi_tool offers documented lossy operations (mode 2 removes profile-7 FEL mapping; editor remove_cmv4 deletes L3/L8/L9/L10/L11 and L254) and generating a Dolby RPU from HDR10+ yields only L1, so no L2/L8 colourist trims. FFmpeg's libx265 wrapper has no HDR10+ path while it enforces Dolby Vision metadata when configured; x265's own options carry both.

Partially verified: the curator re-read none of the cited sources; S12, S13, S10 rest on the producer's pinned reading.

From the READMEs, docs and code at the pins (nothing executed): hdr10plus_tool inject needs a raw HEVC bitstream (extraction also accepts MKV), dovi_tool's HDR10+ SEI matching recognises only ST 2094-40 application version 1 HDR10+ SEI, and print but do not stop on a JSON/video frame-count mismatch (metadata is duplicated or skipped at the end). dovi_tool offers documented lossy operations (mode 2 removes profile-7 FEL mapping; editor remove_cmv4 deletes L3/L8/L9/L10/L11 and L254) and generating a Dolby RPU from HDR10+ yields only L1, so no L2/L8 colourist trims. FFmpeg's libx265 wrapper has no HDR10+ path while it enforces Dolby Vision metadata when configured; x265's own options carry both.

Curator qualifications: Partially verified: the curator re-read none of the cited sources; S12, S13, S10 rest on the producer's pinned reading. Curator GET 2026-10-23 of the sources not re-read (mechanical source evidence, not semantic verification): S12: HTTP 200, bytes differ from the producer pin; S13: HTTP 200, bytes differ from the producer pin; S10: HTTP 200, bytes differ from the producer pin.

Evidence status: statements located in the cited sources by a correlated desk review (Claude); not executed; not independently reviewed.

```json
{
  "citations": [
    {
      "url": "https://github.com/quietvoid/hdr10plus_tool/tree/82cb01ba387184476dbf5fa3bddebf0a345693d7",
      "note": "candidate evidence excerpts"
    },
    {
      "url": "https://github.com/quietvoid/dovi_tool/tree/fd0b28c420d6deceb4be4cb0257fb898504afaa0",
      "note": "candidate evidence excerpts"
    },
    {
      "url": "https://github.com/FFmpeg/FFmpeg/tree/5fd305b8f4214765500f6f6c50a52cf950cb049d",
      "note": "candidate evidence excerpts"
    }
  ]
}
```

Evidence claims:
- [sourced_fact] From the READMEs, docs and code at the pins (nothing executed): hdr10plus_tool inject needs a raw HEVC bitstream (extraction also accepts MKV), dovi_tool's HDR10+ SEI matching recognises only ST 2094-40 application version 1 HDR10+ SEI, and print but do not stop on a JSON/video frame-count mismatch (metadata is duplicated or skipped at the end). dovi_tool offers documented lossy operations (mode 2 removes profile-7 FEL mapping; editor remove_cmv4 deletes L3/L8/L9/L10/L11 and L254) and generating a Dolby RPU from HDR10+ yields only L1, so no L2/L8 colourist trims. FFmpeg's libx265 wrapper has no HDR10+ path while it enforces Dolby Vision metadata when configured; x265's own options carry both. · locator: candidate evidence excerpts · source: https://github.com/quietvoid/hdr10plus_tool/tree/82cb01ba387184476dbf5fa3bddebf0a345693d7

Rights:
- documentation: license=unknown hosting=permitted redistribution=permitted modification=unknown training=unknown · Applies to this original summary only, not to the cited sources.

Use this evidence:
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