Initial snapshot: hand motion pipeline (Dyn-HaMR + dex-retargeting + SPIDER)

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

scripts/verify_dex_video.py

@@ -0,0 +1,18 @@
+"""Decode and verify the complete exported LEAP replay."""
+import json
+import subprocess
+from pathlib import Path
+
+root = Path(__file__).resolve().parents[1] / 'output/dex_2047635068'
+video = root / 'leap_right_replay.mp4'
+result = subprocess.run(['ffprobe', '-v', 'error', '-select_streams', 'v:0',
+                         '-count_frames', '-show_entries',
+                         'stream=width,height,avg_frame_rate,nb_read_frames',
+                         '-of', 'json', str(video)], check=True, capture_output=True, text=True)
+stream = json.loads(result.stdout)['streams'][0]
+assert int(stream['nb_read_frames']) == 1333
+assert stream['avg_frame_rate'] == '30/1'
+assert (stream['width'], stream['height']) == (1280, 480)
+subprocess.run(['ffmpeg', '-v', 'error', '-xerror', '-i', str(video), '-f', 'null', '-'], check=True)
+(root / 'video_validation.json').write_text(json.dumps(dict(stream=stream, full_decode_pass=True), indent=2))
+print('PASS: 1333 frames, 30 fps, 1280x480, full decode')