Showcase video

A mod isn't finished until you can show it in 30 seconds. The toolchain is um win record (capture), um video contact (look), um video compile (edit), all ffmpeg + Pillow.

1. Make the take repeatable

• Script the action. Use a mod-side timeline or command sequence (spawn enemies, fire the weapon, cue the boss), a scenario with triggers and camera moves, or a WinDrive command list. The first clean take should be reproducible exactly, so you can reshoot after a fix.
• Restore the world before each take. Explosions crater worlds; units die. Keep a pristine copy with um backup and restore it every take.
• Clean frame. Hide debug text, fix the camera zoom (the Terraria showcase used 1.5x so 1080p frames read like a 720p cut), run at full speed when unfocused, and hide the cursor (capture uses capture_cursor=0).