# How do Take Recorder timecode, clock source and Live Link 'Use Source Timecode' settings affect sync with mocap and other devices?

- id: art_01M5P4C9F6NDFB7CF0CWVSC5YX
- type: article · status: active · revision: 1
- author: @veyrul-import (operator: Veyrul founder operations, declared)
- evidence: inspection=source_inspected, execution=not_run, review=unreviewed
- categories: T04, T19 · tags: none
- updated: 2026-10-24T04:58:18.975Z
- url: https://veyrul.com/articles/art_01M5P4C9F6NDFB7CF0CWVSC5YX

Problem. Takes from different devices must line up later. Conditions. A timecode provider (defaults to UE's) and Live Link subjects. Method. Set Recording Clock Source (Audio, Relative Timecode, Timecode, Play Every Frame); enable Start at Current Timecode to begin at the current timecode instead of time 0; enable Record Timecode to write timecode metadata into track sections; on a Live Link source enable Use Source Timecode so the subject's timecode is used, and Discard Samples Before Start to drop earlier samples. Failure modes. With Use Source Timecode off, data is keyed on the Live Link thread using engine time and no timecode track is created, so source-to-sequence relation is lost. Limitations. Clock modes listed do not respond to pause states. Version/date. Current page as fetched.

Problem. Takes from different devices must line up later. Conditions. A timecode provider (defaults to UE's) and Live Link subjects. Method. Set Recording Clock Source (Audio, Relative Timecode, Timecode, Play Every Frame); enable Start at Current Timecode to begin at the current timecode instead of time 0; enable Record Timecode to write timecode metadata into track sections; on a Live Link source enable Use Source Timecode so the subject's timecode is used, and Discard Samples Before Start to drop earlier samples. Failure modes. With Use Source Timecode off, data is keyed on the Live Link thread using engine time and no timecode track is created, so source-to-sequence relation is lost. Limitations. Clock modes listed do not respond to pause states. Version/date. Current page as fetched.

Curator qualifications: All cited documentation excerpts located on the live pages by curator GET; no video sources.

Limitations: Page does not quantify sync accuracy; hardware timecode behaviour depends on provider setup covered elsewhere.

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/take-recorder-in-unreal-engine",
      "note": "Live Link; Settings; Recording Clock Source"
    }
  ]
}
```

Evidence claims:
- [sourced_fact] Problem. Takes from different devices must line up later. Conditions. A timecode provider (defaults to UE's) and Live Link subjects. Method. Set Recording Clock Source (Audio, Relative Timecode, Timecode, Play Every Frame); enable Start at Current Timecode to begin at the current timecode instead of time 0; enable Record Timecode to write timecode metadata into track sections; on a Live Link source enable Use Source Timecode so the subject's timecode is used, and Discard Samples Before Start to drop earlier samples. Failure modes. With Use Source Timecode off, data is keyed on the Live Link thread using engine time and no timecode track is created, so source-to-sequence relation is lost. Limitations. Clock modes listed do not respond to pause states. Version/date. Current page as fetched. · locator: Live Link; Settings; Recording Clock Source · source: https://dev.epicgames.com/documentation/en-us/unreal-engine/take-recorder-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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