Remove audio tracks from privacy-processed videos

raw_videos/README.md

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+# SparseVideoNav Privacy-Processed Videos
+
+This directory provides one privacy-processed MP4 for every released BVN and IFN episode.
+
+- Most files are EgoBlur-processed versions of the original recordings and retain their original video resolution.
+- When a matching readable original-resolution EgoBlur file is unavailable, the corresponding privacy-processed 256×256 RGB frames are encoded as the episode MP4 fallback.
+- All videos have face and license-plate blurring. No unredacted raw footage is included.
+- All published MP4 files are video-only; audio tracks are intentionally omitted.
+- Revisit episodes are intentionally excluded.
+
+## Layout
+
+```text
+raw_videos/
+├── README.md
+├── manifest.json
+├── bvn/
+│   ├── metadata.jsonl
+│   └── <episode_id>.mp4
+└── ifn/
+    ├── metadata.jsonl
+    └── <episode_id>.mp4
+```
+
+Each metadata row gives the instruction, video resolution, source type, and (for fallback files) the reason an original-resolution EgoBlur source was unavailable.

raw_videos/manifest.json

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+{
+  "format_version": 2,
+  "subsets": {
+    "bvn": {
+      "episodes": 5433,
+      "source_types": {
+        "egoblur_original_resolution": 3484,
+        "frames_fallback_256x256": 1949
+      },
+      "resolution_distribution": {
+        "2688x2016": 3032,
+        "2688x1512": 401,
+        "256x256": 1949,
+        "1920x1080": 50,
+        "3840x2160": 1
+      },
+      "size_bytes": 598808551065,
+      "duration_seconds": 196689.806686
+    },
+    "ifn": {
+      "episodes": 6260,
+      "source_types": {
+        "egoblur_original_resolution": 4237,
+        "frames_fallback_256x256": 2023
+      },
+      "resolution_distribution": {
+        "2688x2016": 3657,
+        "256x256": 2023,
+        "2688x1512": 528,
+        "1920x1080": 52
+      },
+      "size_bytes": 734399386803,
+      "duration_seconds": 220018.818235
+    }
+  },
+  "totals": {
+    "episodes": 11693,
+    "source_types": {
+      "egoblur_original_resolution": 7721,
+      "frames_fallback_256x256": 3972
+    },
+    "fallback_reasons": {
+      "missing_egoblur_output": 3259,
+      "no_original_resolution_source": 712,
+      "unreadable_egoblur_output": 1
+    },
+    "resolution_distribution": {
+      "2688x2016": 6689,
+      "2688x1512": 929,
+      "256x256": 3972,
+      "1920x1080": 102,
+      "3840x2160": 1
+    },
+    "size_bytes": 1333207937868,
+    "duration_seconds": 416708.624921
+  },
+  "validation": {
+    "unique_episode_ids": true,
+    "metadata_video_files_match": true,
+    "all_h264": true,
+    "all_videos_privacy_processed": true,
+    "all_videos_video_only": true,
+    "all_container_video_duration_deltas_lte_0_2_seconds": true
+  }
+}