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
- Each player records their POV with Flashback during the same session.
- Drop the resulting
.zipfiles into<gameDir>/flashback/replays/. - Launch Minecraft with Flashback + MultiView installed.
- Click the camera icon → Select Replay.
- Tick the checkbox to the right of each replay (minimum two).
- Click Merge N Replays in the top-right corner.
- The merged replay
merged_<timestamp>.zipappears 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
ClientboundSetTimePacketwith 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 —
.partfile + 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.
