{
  "analysis": "Row 1 changes in 1199 out of 1199 frames - it's the progress bar row that updates every frame. I need to optimize for this case. Let me analyze row 1's change pattern specifically.",
  "plan": "Analyze row 1's change pattern in detail to design an optimal encoding strategy for this frequently-changing row.",
  "commands": [
    {
      "keystrokes": "python3 -c \"\nimport struct\n\nwith open('/app/frames.tza', 'rb') as f:\n    f.read(4)\n    w, h = struct.unpack('<HH', f.read(4))\n    n_frames, max_bytes = struct.unpack('<II', f.read(8))\n    frames = [f.read(w*h) for _ in range(n_frames)]\n\n# Analyze row 1 changes in detail\nfor i in range(min(20, n_frames)):\n    prev = frames[i-1][w:2*w] if i > 0 else bytes(w)\n    curr = frames[i][w:2*w]\n    changes = [(c, prev[c], curr[c]) for c in range(w) if prev[c] != curr[c]]\n    print(f'Frame {i}: {len(changes)} changes at cols {[c for c,_,_ in changes]}')\n\"\n",
      "duration": 2.0
    }
  ]
}