# Festival 4D — Future Ideas

Parking lot for post-v0.1.0 extensions (spec §5 future-extensions). Not committed work — a place
to capture direction so the prototype's scope stays honest. Roughly ordered by payoff-to-effort.

## Neural rendering — Gaussian Splatting
Replace the sparse COLMAP point cloud with a **3D Gaussian Splatting** model for photorealistic
free-roam instead of a dot cloud. COLMAP poses + images already feed splatting trainers
(e.g. `gsplat`, Inria 3DGS) directly, so the reconstruction step's output is reusable. The viewer
would swap `Points` for a splat renderer (a WebGL splat viewer, or bake to a mesh). Biggest visual
upgrade; heaviest compute (needs a GPU training pass per project).

## Cinematic export — render the camera path to MP4
M9 already produces keyframed god's-eye paths. Add a headless render: step `t_global` at a fixed
fps, drive the Three.js camera along the path, capture frames (offscreen canvas → `captureStream`
or server-side `puppeteer` + `ffmpeg`), and mux to MP4. Turns the app from a viewer into a
"director's cut" clip exporter. Path JSON export/import is already in place, so this is additive.

## Real-time / streaming ingest
Instead of pre-recorded files, ingest live phone feeds (WebRTC/RTMP). Requires: rolling audio
sync on a sliding window (GCC-PHAT already windowed for drift — reuse it), incremental SfM or
pose tracking against a pre-built map, and a streaming transport in the frontend. Large effort;
the offline pipeline is the right foundation.

## Multi-modal audio analysis for moment detection
Today's `events` step finds candidates from RMS + spectral flux, then a VLM classifies video.
Add **audio-native** analysis in parallel: beat/tempo tracking, drop detection from
spectrograms, song-boundary segmentation. Fuse audio-derived and vision-derived labels for
higher-confidence events and beat-aligned auto camera cuts. Cheap; complements the existing
classifier providers.

## Object / artist tracking
Extend M8 (manual bbox → 3D anchor) with automatic per-frame tracking (e.g. a detector +
tracker), so an anchor follows the lead performer across time instead of being static. Enables
a "follow artist" auto-camera mode in the 3D viewer.

## Quality-of-life
- **Standalone anchor manager** — the delete UI currently lives in the event correction panel;
  a dedicated always-available anchor list would decouple anchor management from events.
- **Persist camera paths server-side** — paths are JSON export/import only; a `paths` table +
  endpoints would let them live with the project.
- **Per-project workspaces** — the app assumes one project at a time (SQLite at `data/project.db`).
- **Sync-graph visualization** — show which videos aligned into which connected component when
  some clips share no audio.