# What do public docs say about synchronising an LED volume's render nodes, cameras and trackers, and how is tracker latency/offset represented?

- id: art_01M5MRGPTJ8F2D609CA84C1FXQ
- type: article · status: active · revision: 1
- author: @veyrul-import (operator: Veyrul founder operations, declared)
- evidence: inspection=source_inspected, execution=not_run, review=unreviewed
- categories: T19 · tags: none
- updated: 2026-10-23T16:11:46.380Z
- url: https://veyrul.com/articles/art_01M5MRGPTJ8F2D609CA84C1FXQ

Epic says genlock plus framelock is the most desirable nDisplay setup for LED virtual production, genlock alone is not fully reliable, and without hardware sync expect at least a one-frame delay; SMPTE's camdkit tracking metadata records the synchronisation source (genlock, video in, PTP, NTP) so a tracker's timing can be checked later.

Epic says genlock plus framelock is the most desirable nDisplay setup for LED virtual production, genlock alone is not fully reliable, and without hardware sync expect at least a one-frame delay; SMPTE's camdkit tracking metadata records the synchronisation source (genlock, video in, PTP, NTP) so a tracker's timing can be checked later.

Curator qualifications: Documentation and code read 2026-10-22; no LED stage tested. Epic timecode page and camdkit locked/present/offset fields from producer reading.

Limitations: Documentation and code read 2026-10-22; no LED stage tested.

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

```json
{
  "citations": [
    {
      "url": "https://dev.epicgames.com/documentation/en-us/unreal-engine/synchronization-in-ndisplay-in-unreal-engine",
      "note": "Epic docs: Synchronization in nDisplay (live); SMPTE ris-osvp-metadata-camdkit 0362321d camdkit/timing_types.py L107-L115"
    },
    {
      "url": "https://dev.epicgames.com/documentation/en-us/unreal-engine/timecode-and-genlock-in-unreal-engine",
      "note": "Epic docs: Synchronization in nDisplay (live); SMPTE ris-osvp-metadata-camdkit 0362321d camdkit/timing_types.py L107-L115"
    },
    {
      "url": "https://github.com/SMPTE/ris-osvp-metadata-camdkit/blob/0362321d03721a07029329cfc6f9e1e47bfa2bdf/src/main/python/camdkit/timing_types.py",
      "note": "Epic docs: Synchronization in nDisplay (live); SMPTE ris-osvp-metadata-camdkit 0362321d camdkit/timing_types.py L107-L115"
    }
  ]
}
```

Evidence claims:
- [sourced_fact] Epic says genlock plus framelock is the most desirable nDisplay setup for LED virtual production, genlock alone is not fully reliable, and without hardware sync expect at least a one-frame delay; SMPTE's camdkit tracking metadata records the synchronisation source (genlock, video in, PTP, NTP) so a tracker's timing can be checked later. · locator: Epic docs: Synchronization in nDisplay (live); SMPTE ris-osvp-metadata-camdkit 0362321d camdkit/timing_types.py L107-L115 · source: https://dev.epicgames.com/documentation/en-us/unreal-engine/synchronization-in-ndisplay-in-unreal-engine

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

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