Composite Image + Video Generation → Final Merge

Three phases: composite scene images → video clips → merged final animation.

All shots are processed concurrently — for 15 shots the total runtime is roughly the time for one composite + one video, not 15× that.

Setup: .env

Same .env as Step 3 — if it already exists in your project directory from running generate_images.py, no extra setup is needed. Only KIE_API_TOKEN is used by this script (IMGBB_API_KEY is ignored here).

If no .env is present, the script auto-creates a template and exits:

KIE_API_TOKEN=your_kie_api_key_here
IMGBB_API_KEY=your_imgbb_api_key_here