# HyperTwist Phase 4R Packet 4R-F remotion Media-Export Implementation

Created on `2026-05-13`

## Status

`Phase 4R / Packet 4R-F` is now `closed`.

This packet converts the retained boundary-sensitive `remotion-dev/remotion` row from a queued commercially sensitive media-export and explainer sidecar candidate into a landed first-party HyperTwist media-export, embedded-playback, parser, explainer-studio, and compliance-boundary lane.

It does not reopen `Phase 0R`, `Phase 1R`, `Phase 2R`, `Phase 3R`, or `Phase 4R-A` through `Phase 4R-E`.

Those earlier packets still own:

- source-value extraction
- retained-set routing
- ownership and acceptance boundaries
- landed permissive owner decisions
- landed classic-cubing, legacy `4D`, shared-assets, PostHog, and screenpipe boundary-sensitive decisions

This packet owns the next question instead:

- what first-party media-export implementation actually landed
- how the retained Remotion value was reduced to embedded playback, render orchestration, media parsing, explainer-studio preview/output registration, and package-split compliance boundaries
- how the commercial license boundary stayed explicit
- what validation was completed
- what the next bounded move is after this landing

## Authority order

For future work on the Remotion boundary-sensitive lane, read in this order:

1. this packet for landed media-export scope, package-split boundary result, and validation result
2. [HYPERTWIST_LIVE_LANES_SOURCE_AND_PRESERVATION_AUDIT_2026-05-13.md](C:/HyperTwist/docs/HYPERTWIST_LIVE_LANES_SOURCE_AND_PRESERVATION_AUDIT_2026-05-13.md:1) for live-lane preserve posture
3. [HYPERTWIST_PHASE_1R_RETAINED_SET_CONTRACT_AND_HANDOFF_2026-05-13.md](C:/HyperTwist/docs/HYPERTWIST_PHASE_1R_RETAINED_SET_CONTRACT_AND_HANDOFF_2026-05-13.md:1) for retained-set routing
4. [HYPERTWIST_PHASE_0R_PACKET_0R_C_EVALUATION_2026-05-12.md](C:/HyperTwist/docs/HYPERTWIST_PHASE_0R_PACKET_0R_C_EVALUATION_2026-05-12.md:1) for source-value extraction and non-promotion rationale
5. [HYPERTWIST_MODEL_A_MAX_VALUE_EXTRACTION_MODUS_OPERANDI_2026-05-13.md](C:/HyperTwist/docs/HYPERTWIST_MODEL_A_MAX_VALUE_EXTRACTION_MODUS_OPERANDI_2026-05-13.md:1) for the canonical interpretation rule that keeps future `Model A` extraction rich rather than shallow
6. [REPO_LICENSE_TRACKING.md](C:/HyperTwist/docs/REPO_LICENSE_TRACKING.md:1) for package-license, commercial-boundary, notice, and provenance obligations

## Packet licensing snapshot

Owner row widened by this packet:

- `remotion-dev/remotion`: custom two-tier commercial license at repo level; `@remotion/studio` exposes `MIT`, while `@remotion/player`, `@remotion/renderer`, and `@remotion/media-parser` still point back to the broader checked Remotion license posture

Checked local notice and package-boundary surfaces:

- [LICENSE.md](C:/Workspaces/HyperTwist/mirrors/restrictive/remotion-dev/remotion/LICENSE.md:1)
- [package.json](C:/Workspaces/HyperTwist/mirrors/restrictive/remotion-dev/remotion/package.json:1)
- [packages/player/package.json](C:/Workspaces/HyperTwist/mirrors/restrictive/remotion-dev/remotion/packages/player/package.json:1)
- [packages/renderer/package.json](C:/Workspaces/HyperTwist/mirrors/restrictive/remotion-dev/remotion/packages/renderer/package.json:1)
- [packages/studio/package.json](C:/Workspaces/HyperTwist/mirrors/restrictive/remotion-dev/remotion/packages/studio/package.json:1)
- [packages/media-parser/package.json](C:/Workspaces/HyperTwist/mirrors/restrictive/remotion-dev/remotion/packages/media-parser/package.json:1)

Checked retained source surfaces:

- [packages/player/src/Player.tsx](C:/Workspaces/HyperTwist/mirrors/restrictive/remotion-dev/remotion/packages/player/src/Player.tsx:1)
- [packages/player/src/PlayerControls.tsx](C:/Workspaces/HyperTwist/mirrors/restrictive/remotion-dev/remotion/packages/player/src/PlayerControls.tsx:1)
- [packages/player/src/player-methods.ts](C:/Workspaces/HyperTwist/mirrors/restrictive/remotion-dev/remotion/packages/player/src/player-methods.ts:1)
- [packages/player/src/use-playback.ts](C:/Workspaces/HyperTwist/mirrors/restrictive/remotion-dev/remotion/packages/player/src/use-playback.ts:1)
- [packages/renderer/src/render-media.ts](C:/Workspaces/HyperTwist/mirrors/restrictive/remotion-dev/remotion/packages/renderer/src/render-media.ts:1)
- [packages/media-parser/src/parse-media.ts](C:/Workspaces/HyperTwist/mirrors/restrictive/remotion-dev/remotion/packages/media-parser/src/parse-media.ts:1)
- [packages/media-parser/src/worker-server.ts](C:/Workspaces/HyperTwist/mirrors/restrictive/remotion-dev/remotion/packages/media-parser/src/worker-server.ts:1)
- [packages/media-parser/src/worker/forward-controller-to-worker.ts](C:/Workspaces/HyperTwist/mirrors/restrictive/remotion-dev/remotion/packages/media-parser/src/worker/forward-controller-to-worker.ts:1)
- [packages/media-parser/src/work-on-seek-request.ts](C:/Workspaces/HyperTwist/mirrors/restrictive/remotion-dev/remotion/packages/media-parser/src/work-on-seek-request.ts:1)
- [packages/studio/src/api/save-render-output.ts](C:/Workspaces/HyperTwist/mirrors/restrictive/remotion-dev/remotion/packages/studio/src/api/save-render-output.ts:1)
- [packages/studio/src/api/seek.ts](C:/Workspaces/HyperTwist/mirrors/restrictive/remotion-dev/remotion/packages/studio/src/api/seek.ts:1)
- [packages/studio/src/api/play.ts](C:/Workspaces/HyperTwist/mirrors/restrictive/remotion-dev/remotion/packages/studio/src/api/play.ts:1)
- [packages/studio/src/api/pause.ts](C:/Workspaces/HyperTwist/mirrors/restrictive/remotion-dev/remotion/packages/studio/src/api/pause.ts:1)
- [packages/studio/src/api/visual-control.ts](C:/Workspaces/HyperTwist/mirrors/restrictive/remotion-dev/remotion/packages/studio/src/api/visual-control.ts:1)
- [packages/studio/src/api/update-default-props.ts](C:/Workspaces/HyperTwist/mirrors/restrictive/remotion-dev/remotion/packages/studio/src/api/update-default-props.ts:1)

Boundary result:

- no donor source files were copied into first-party owned Unreal source in this packet
- no claim was made that the whole Remotion authoring shell, template ecosystem, or cloud platform is now live in HyperTwist
- the landed surface is a first-party Unreal media-export contract and runtime API that preserves bounded embedded playback, render orchestration, media parsing, explainer preview/output registration, and explicit commercial-license/package-split compliance boundaries

## Packet result

`4R-F` lands the Remotion row as:

- `remotion-dev/remotion` -> `implemented_live_boundary_sensitive`

Current portfolio effect:

- curated HyperTwist shallow-eval set: `71`
- currently verified live in checked Unreal surfaces: `20`
- live permissive lanes: `13`
- live boundary-sensitive lanes: `6`
- live restrictive clean-room lanes: `1`
- active non-live implementation-board rows: `39`

## First-party landing surfaces

The landed first-party Unreal surfaces are:

- [HyperTwistTrainingMediaExportLibrary.h](C:/HyperTwist/UnrealHyperTwist/Source/UnrealHyperTwist/Public/HyperTwistTraining/HyperTwistTrainingMediaExportLibrary.h:1)
- [HyperTwistTrainingMediaExportLibrary.cpp](C:/HyperTwist/UnrealHyperTwist/Source/UnrealHyperTwist/Private/HyperTwistTraining/HyperTwistTrainingMediaExportLibrary.cpp:1)
- [HyperTwistTrainingRuntimeLibrary.h](C:/HyperTwist/UnrealHyperTwist/Source/UnrealHyperTwist/Public/HyperTwistTraining/HyperTwistTrainingRuntimeLibrary.h:1)
- [HyperTwistTrainingRuntimeLibrary.cpp](C:/HyperTwist/UnrealHyperTwist/Source/UnrealHyperTwist/Private/HyperTwistTraining/HyperTwistTrainingRuntimeLibrary.cpp:1)
- [hypertwist-reference-incorporation-targets.json](C:/HyperTwist/UnrealHyperTwist/Content/HyperTwistTraining/MaterializedCatalog/hypertwist-reference-incorporation-targets.json:1)
- [hypertwist-catalog-materialization-summary.json](C:/HyperTwist/UnrealHyperTwist/Content/HyperTwistTraining/MaterializedCatalog/hypertwist-catalog-materialization-summary.json:1)
- [remotion-dev-remotion-media-export-reference-pages.jsonl](C:/HyperTwist/UnrealHyperTwist/Content/HyperTwistTraining/MaterializedCatalog/raw-extracts/remotion-dev-remotion-media-export-reference-pages.jsonl:1)

## Landed implementation scope

What landed:

- a first-party media-export package ledger covering:
  - root commercial-license posture
  - `@remotion/player`
  - `@remotion/renderer`
  - `@remotion/media-parser`
  - `@remotion/studio`
- a first-party embedded playback contract that records:
  - timeline lifecycle
  - player method surface
  - playback controls
  - bounded embedding seams
- a first-party render orchestration contract that records:
  - render entry points
  - output registration
  - export sequencing
  - replay-explainer render posture
- a first-party media parser contract that records:
  - parse pipeline
  - worker forwarding
  - seek handling
  - bounded metadata and timeline parsing seams
- a first-party explainer-studio contract that records:
  - seek/play/pause controls
  - visual control surfaces
  - default-prop update seams
  - render-output registration posture
- a first-party compliance boundary that keeps:
  - the commercial-license gate explicit
  - the package split explicit
  - the broader authoring shell, templates, and platform ownership excluded
- first-party runtime-library accessors and TSV checklist export for the new media-export bundle
- bundled first-party reference targets and raw source-reference capture for embedded playback, render orchestration, media parsing, explainer studio, and compliance boundaries

What that means in practice:

- `remotion-dev/remotion` now owns the landed boundary-sensitive media-export and replay-explainer preserve lane in HyperTwist
- the landed surface is a first-party Unreal contract and runtime API, not a vague future donor note
- the practical path is bounded media export and explainable playback support rather than whole-product shell inheritance
- the package split and commercial-license boundary remain explicit

## Preserved landed value

The donor value that was actually promoted is:

- embeddable playback and transport-control semantics
- render orchestration and output-registration posture
- media parsing, worker, and seek-handling semantics
- explainer-studio preview and control semantics
- explicit package-split and commercial-license compliance boundaries

## Excluded or non-promotion boundary

Do not promote this packet into:

- blanket Remotion authoring-shell adoption
- template ecosystem ownership
- cloud or serverless render-platform ownership
- generalized browser-app ownership
- misstatement of custom-license packages as plain `MIT`

Rationale:

- the retained value is concentrated in embedded playback, bounded export orchestration, media parsing, studio control semantics, and compliance discipline
- the right legal and architectural posture is a bounded first-party sidecar lane, not broad product adoption
- the package split must stay explicit because `@remotion/studio` being `MIT` does not flatten the main media-export package set into an ordinary permissive donor

## Acceptance markers satisfied

The `0R-C` and `Phase 1R` retained-value markers for this lane are now satisfied in first-party Unreal surfaces:

- a first-party embedded playback contract exists
- a first-party render orchestration contract exists
- a first-party media parser contract exists
- a first-party explainer-studio contract exists
- a first-party commercial-license and package-split compliance boundary exists
- bundled first-party reference targets exist for playback, rendering, parsing, studio controls, and compliance boundaries

## Validation

Validation completed for this packet:

- Unreal build succeeded with:
  - `C:\Program Files\Epic Games\UE_5.7\Engine\Build\BatchFiles\Build.bat UnrealHyperTwistEditor Win64 Development C:\HyperTwist\UnrealHyperTwist\UnrealHyperTwist.uproject -WaitMutex -NoHotReloadFromIDE`
- packet-bearing code compiled after the new `HyperTwistTrainingMediaExportLibrary` and runtime accessors were added
- `git diff --check`
- JSON validation for the updated materialized-catalog files and workspace manifest
- CSV import validation for the four canonical v6.3 ledgers
- final repo status check before commit

Build result:

- `Succeeded` on `2026-05-13`

## Next move

The next bounded move is `Phase 5R-A`:

- preserve the six landed boundary-sensitive lanes through their live-lane audit and packet authority
- open `cubing/alg.js` as the first refreshed clean-room implementation lane from its scrubbed Model A dossier
- keep the optional `Phase 3R-G` browser comparison lane deferred unless the landed browser stack exposes a real gap
