Center-crop preview video to 720x720, preserving 50 FPS and duration

SHA256SUMS

@@ -7,8 +7,8 @@ e5b5bfb4e5fe8320584a20d12d729081a8c29980919be9540e8256d0a3d0fee5  eval/backflip.
 d2478a39f6d03018d830be78c9d72a7322e755932f21e0c307305220ab890396  eval/onnx-parity.json
 8e3b3fc4530883b403c5f6bec48371e04985b6a3c3957a02bcedd99896c38ba3  eval/render-20260929.json
 a0c92f27287602cd7983d16957890584ce8b9d323a10ffc1aad1b1a60283a52a  eval/summary.json
-c3de8687b897e3dc50944c76d72f30c1597937bb81d1aab0563d9ef9f4cbeca2  manifest.json
-e0b3e1e17f68151dff05dc019999c0053bf6820cad6e44b2e80e305d799a36bd  media/preview.mp4
+f19a7286d44bc186512abc4655f195a3a67d0e48c8683e47dd79aeea49ec2adb  manifest.json
+22437bb1847d1a4637ad9a22adbb4d2c2b2ca76025434634e457ab3d253c0eec  media/preview.mp4
 841e4eebfbe9946145f88cf01ce3f8f8a501b6b9312b0f037f2b4e0a5f91a48c  media/social-preview.jpg
 b4d780ee2a2bf7aab5b33358124fd079b17a329412d496574296919dbc5b6ee0  media/social-preview.png
 59dd61ea1e8566a3bad9f8b24dd18530664906c33964b1c05e6ed6e821e16a24  policy.onnx

manifest.json

@@ -31,14 +31,23 @@
   "robustness_claim": false,
   "media": {
     "preview": "media/preview.mp4",
-    "preview_sha256": "e0b3e1e17f68151dff05dc019999c0053bf6820cad6e44b2e80e305d799a36bd",
+    "preview_sha256": "22437bb1847d1a4637ad9a22adbb4d2c2b2ca76025434634e457ab3d253c0eec",
     "source_montage_sha256": "60626e213e5513b85ed6d7a84988040c782e83ebbae84e326529a7f25e7c782c",
     "interval_s": [
       7.42,
       11.46
     ],
     "edited_research_montage": true,
-    "exact_checkpoint_seed_mapping_verified": false
+    "exact_checkpoint_seed_mapping_verified": false,
+    "center_crop": {
+      "width": 720,
+      "height": 720,
+      "x": 120,
+      "y": 0
+    },
+    "fps": 50,
+    "frames": 200,
+    "uncropped_excerpt_sha256": "e0b3e1e17f68151dff05dc019999c0053bf6820cad6e44b2e80e305d799a36bd"
   },
   "additional_policy_switching": false,
   "onnx_export_path": "scripts/export.py",

media/preview.mp4

@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:e0b3e1e17f68151dff05dc019999c0053bf6820cad6e44b2e80e305d799a36bd
-size 330792
+oid sha256:22437bb1847d1a4637ad9a22adbb4d2c2b2ca76025434634e457ab3d253c0eec
+size 314190