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Add section to save segmented frames as video in video_predictor_example.ipynb notebook #714

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Add section to save segmented frames as video in video_predictor_example.ipynb notebook #714

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60 changes: 58 additions & 2 deletions notebooks/video_predictor_example.ipynb
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Original file line number Diff line number Diff line change
Expand Up @@ -1401,6 +1401,62 @@
" show_mask(out_mask, plt.gca(), obj_id=out_obj_id)"
]
},
{
"cell_type": "markdown",
"id": "f37870b9",
"metadata": {},
"source": [
"<br>\n",
"\n",
"### Save the Segmented Frames and Create a Video"
]
},
{
"cell_type": "code",
"execution_count": null,
"id": "aa0e361b",
"metadata": {},
"outputs": [],
"source": [
"import os\n",
"import cv2\n",
"import numpy as np\n",
"from PIL import Image\n",
"\n",
"# Define video writer\n",
"h, w = Image.open(os.path.join(video_dir, frame_names[0])).size[::-1] # (height, width)\n",
"out = cv2.VideoWriter(\"segmented_output.mp4\", cv2.VideoWriter_fourcc(*\"mp4v\"), 25, (w, h))\n",
"\n",
"# Loop through all frames in order\n",
"for out_frame_idx in range(len(frame_names)):\n",
" # Load original frame\n",
" frame_path = os.path.join(video_dir, frame_names[out_frame_idx])\n",
" frame = np.array(Image.open(frame_path).convert(\"RGB\"))\n",
"\n",
" # Convert to BGR for OpenCV\n",
" frame = cv2.cvtColor(frame, cv2.COLOR_RGB2BGR)\n",
"\n",
" # If we have segmentation results for this frame\n",
" if out_frame_idx in video_segments:\n",
" for out_obj_id, out_mask in video_segments[out_frame_idx].items():\n",
" # Convert mask to uint8\n",
" mask = (out_mask.astype(np.uint8) * 255)\n",
"\n",
" # Blue mask\n",
" colored_mask = np.zeros_like(frame, dtype=np.uint8)\n",
" colored_mask[:, :, 0] = mask # Blue channel\n",
" colored_mask[:, :, 1] = 0 # Green channel\n",
" colored_mask[:, :, 2] = 0 # Red channel\n",
"\n",
" # Blend with original frame (alpha blending)\n",
" frame = cv2.addWeighted(frame, 1.0, colored_mask, 0.5, 0)\n",
"\n",
" # Write frame to video\n",
" out.write(frame)\n",
"\n",
"out.release()\n"
]
},
{
"cell_type": "markdown",
"id": "18a0b9d7-c78f-432b-afb0-11f2ea5b652a",
Expand All @@ -1414,7 +1470,7 @@
],
"metadata": {
"kernelspec": {
"display_name": "Python 3 (ipykernel)",
"display_name": "sam2",
"language": "python",
"name": "python3"
},
Expand All @@ -1428,7 +1484,7 @@
"name": "python",
"nbconvert_exporter": "python",
"pygments_lexer": "ipython3",
"version": "3.10.14"
"version": "3.10.18"
}
},
"nbformat": 4,
Expand Down