first commit

make_animation.py

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+import base64
+from pathlib import Path
+import json
+import subprocess
+import sys
+
+fps = 5
+
+infile = Path(sys.argv[1])
+
+with open(infile) as f:
+    data = json.load(f)
+
+fps = data['fps']
+duration = data['duration']
+frames = data['frames']
+
+print(len(frames))
+for i,frame in enumerate(frames):
+    print(i)
+    pngdir = Path('pngs')
+    pngdir.mkdir(exist_ok=True)
+    filename = Path(f'frame-{i:04d}.png')
+    pngname = pngdir / filename
+    with open(pngname, 'wb') as f:
+        png = base64.b64decode(frame[len('data:image/png;base64,'):])
+        f.write(png)
+
+outfile = Path(infile.name).with_suffix('.mp4')
+subprocess.run(['ffmpeg','-r',str(fps),'-f','image2','-i','pngs/frame-%04d.png','-vcodec','libx264','-crf','25','-pix_fmt','yuv420p','-vf','pad=ceil(iw/2)*2:ceil(ih/2)*2',outfile,'-y']);