File size: 2,261 Bytes
42afafb | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 | #!/usr/bin/env python
"""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()
|