| |
| """Compose truth | sim... side-by-side comparison video with labels. |
| |
| Usage: |
| python compose_video.py --world work/B_03/world \ |
| --sims work/B_03/out_p1 work/B_03/out_p2 \ |
| --labels "mu=0.5 e=0.05" "mu=0.02 e=0.9" \ |
| --out work/B_03/compare_B_03.mp4 |
| """ |
| import argparse |
| import json |
| from pathlib import Path |
|
|
| import cv2 |
| import numpy as np |
|
|
|
|
| def read_frames(path): |
| cap = cv2.VideoCapture(str(path)) |
| frames = [] |
| while True: |
| ok, f = cap.read() |
| if not ok: |
| break |
| frames.append(f) |
| cap.release() |
| return frames |
|
|
|
|
| def main(): |
| ap = argparse.ArgumentParser() |
| ap.add_argument("--world", required=True) |
| ap.add_argument("--sims", nargs="+", required=True) |
| ap.add_argument("--labels", nargs="+", required=True) |
| ap.add_argument("--truth-label", default="truth (reference)") |
| ap.add_argument("--out", required=True) |
| args = ap.parse_args() |
| assert len(args.labels) == len(args.sims) |
|
|
| spec = json.loads((Path(args.world) / "spec.json").read_text()) |
| W, H = spec["video"]["width"], spec["video"]["height"] |
| fps = spec["video"]["fps"] or 24.0 |
|
|
| panels = [(args.truth_label, read_frames(Path(args.world) / "render.mp4"))] |
| for sim, lab in zip(args.sims, args.labels): |
| panels.append((lab, read_frames(Path(sim) / "sim.mp4"))) |
|
|
| n = min(len(f) for _, f in panels) |
| canvas_w, canvas_h = W * len(panels), H |
| writer = cv2.VideoWriter(str(args.out), cv2.VideoWriter_fourcc(*"mp4v"), |
| fps, (canvas_w, canvas_h)) |
| font = cv2.FONT_HERSHEY_SIMPLEX |
| for i in range(n): |
| row = [] |
| for k, (lab, frames) in enumerate(panels): |
| f = frames[i] |
| if f.shape[:2] != (H, W): |
| f = cv2.resize(f, (W, H)) |
| tag = f"{lab} [{i+1}/{n}]" |
| cv2.rectangle(f, (0, 0), (W, 34), (0, 0, 0), -1) |
| cv2.putText(f, tag, (10, 24), font, 0.62, (255, 255, 255), 2, cv2.LINE_AA) |
| if k: |
| cv2.line(f, (0, 0), (0, H), (255, 255, 255), 2) |
| row.append(f) |
| writer.write(np.hstack(row)) |
| writer.release() |
| print(f"wrote {args.out} ({n} frames, {canvas_w}x{canvas_h})") |
|
|
|
|
| if __name__ == "__main__": |
| main() |
|
|
