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MultiView - Flashback Addon

MultiView - Flashback Addon

Merges multiple Flashback replays from the same session into a single unified replay — an “omniscient observer” view combining the union of chunks, players, and events seen from each POV.

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1,081
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Compatibility

Minecraft: Java Edition

26.1.x
1.21.9–1.21.11

Platforms

Supported environments

Client-side

Links

Report issues View source

Tags

Creators

Details

Licensed MIT
Published last month

MultiView — merge multi-player Flashback replays

MultiView is a Fabric add-on for Flashback. Each player records their own POV with Flashback; MultiView fuses those recordings into one unified replay that behaves as if a single omniscient observer had captured the whole session.

  • ✅ Every chunk explored by any POV is included
  • ✅ Every recording player is visible at the same time
  • ✅ Every entity and event seen by at least one POV is kept
  • ✅ Free camera or Spectate Player on the merged replay
  • ✅ Tick-perfect time alignment, atomic rollback on failure

Who is this for?

  • Content creators — SMP recaps, PvP tournaments, machinima with multi-angle coverage from a single replay file.
  • Server staff — multi-angle review of incidents, anti-cheat investigations from every involved player's POV.
  • Cinematographers — free camera through a multiplayer scene with no information loss.

How to merge two replays

  1. Each player records their POV with Flashback during the same session.
  2. Drop the resulting .zip files into <gameDir>/flashback/replays/.
  3. Launch Minecraft with Flashback + MultiView installed.
  4. Click the camera icon → Select Replay.
  5. Tick the checkbox to the right of each replay (minimum two).
  6. Click Merge N Replays in the top-right corner.
  7. The merged replay merged_<timestamp>.zip appears in the list once the progress screen finishes.

Compatibility

Minecraft Flashback MultiView
1.21.9 / 1.21.10 0.39.x 0.3.2+mc1.21.9
1.21.11 0.39.4 0.3.2+mc1.21.11
26.1 / 26.1.1 / 26.1.2 0.40.0 0.3.2+mc26.1

Requires Fabric API. Java 21 on 1.21.x, Java 25 on 26.1+.

Features

  • N-way merge — works from 2 up to many POVs.
  • Tick-perfect alignment via ClientboundSetTimePacket with metadata fallback.
  • Cross-source deduplication — chunks (SHA-256 128-bit content hash), player info, system chat by visible text, entity moves.
  • Multi-dimension — secondary POV dimension changes preserved as markers.
  • Aggregated markers from every POV on a single timeline.
  • Atomic write — .part file + atomic rename; a failed merge never destroys an existing replay.
  • Bounded memory — LRU-capped chat dedup, cryptographic chunk hashing, safe on multi-hour sessions.
  • i18n — French and English.

Known limitations

  • Secondary POVs appear as regular player entities (Flashback only supports one local player; the camera follows the first POV to start recording).
  • 4+ POV merges may produce minor visual artefacts in zones where conflicting chunk versions overlap.
  • Full technical limitations and roadmap in SPEC.md.

Links

License

MIT — free to use, modify and redistribute. Flashback remains under its proprietary license by Moulberry; MultiView is a fully independent add-on and does not redistribute any Flashback code.