TiXL Meetup 2026-06-15 / Per-Parameter Snapshots, FFmpeg Clips, MIDI Recording & DMX Lighting

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A 4h45m TiXL 4.2-alpha developer meet-up with live Q&A: a reworked per-parameter snapshot/preset control, the FFmpeg-based video / audio / data clip system with MIDI & OSC recording and playback, an equirectangular 360° dome workflow, guided feature tests, and a hands-on look at driving Art-Net / DMX stage lights from points.

🆕 new feature · 🛠️ improvement · 📘 operator · 📝 walkthrough · 🧠 deep dive · 🍿 showcase · 🎯 planned · 💬 discussion · ⚠️ heads-up

Chapters

• 0:00 📝 Improvised intro graph (LineTextPoints, lines, noise)
• 4:33 🆕 Per-parameter snapshots: expose single parameters
• 8:11 🧠 Overshooting, reverting, and stepping/blending presets
• 14:50 📘 ChromaticDistortion as a snapshot-indexed post effect
• 16:00 🆕 The snapshot control view as a scene overview
• 22:13 ⚠️ Grouping into a new symbol breaks the snapshot mapping
• 31:40 💬 A 2D preset landscape via t-SNE dimensionality reduction
• 39:46 🧠 Why per-parameter capture stays flat by default
• 43:00 🎯 Preset groups, auto-transitions and VJ automation
• 50:00 🍿 Building a VJ scene with calm/shake snapshots
• 1:02:50 🧠 Snapshot vs. preset: who owns the saved values
• 1:06:30 ⚠️ Gradients blend only with matching step counts
• 1:14:00 🎯 Number-key bookmarks for snapshots, graphs and pins
• 1:18:00 ⚠️ 4.2 snapshot backward-compatibility notes
• 1:32:50 🆕 Guided feature tests and the SkillQuest tour
• 1:33:50 🛠️ Markdown help links and versioned alpha folders
• 1:51:00 🧠 Moving video playback from Media Foundation to FFmpeg
• 1:55:50 🆕 VideoClip: pooled players, auto-collect and crossfade
• 2:03:00 🧠 Fast-seek cache vs. GPU playback-performance mode
• 2:08:30 💬 Why slow seeking is the encoding (GOP size) + FFmpeg rant
• 2:22:40 📘 PlayVideo on FFmpeg with override-time-in-seconds
• 2:23:40 📝 Dropping an MP3 to make an audio clip with spectrum
• 2:27:00 🆕 Recording and replaying MIDI / OSC into data clips
• 2:34:00 📝 MIDI key ranges and the AnalyzePianoMidi operator
• 2:48:00 🛠️ Exporting and cleaning recorded data channels as CSV
• 2:54:00 ⚠️ Per-project meta folder for snapshots, thumbnails, backups
• 3:06:00 🍿 Driving a 360° projection dome via equirectangular Spout/NDI
• 3:08:00 🧠 SliceViewport: skip shading unused regions
• 3:10:13 🧠 Raymarching the visible band by changing the projection
• 3:18:00 🛠️ Disabling a face camera and feeding a black texture
• 3:23:20 💬 What a Shader Resource View actually is
• 3:25:00 ⚠️ Fixing billboard distortion with point orientation
• 3:29:00 📘 DrawRayLines for lines that cross the camera plane
• 3:34:00 💬 Supporting the project (server boosts)
• 3:37:40 🆕 Control+Shift+D: duplicate with connections
• 3:40:00 🧠 Dev workflow: git worktrees and a second TiXL instance
• 3:55:00 📝 Authoring SkillQuest levels live
• 4:09:00 🍿 The motorized microscope rig (ESP32) and stage lighting
• 4:14:00 🧠 How Art-Net and DMX actually work
• 4:23:00 📘 PointsToDmxLights: each point becomes a fixture
• 4:30:00 💬 Aiming moving heads and surprisingly cheap fixtures
• 4:36:00 💬 Wrap-up and next steps