Use tempfile

app.py

@@ -1,5 +1,6 @@
 import colorsys
 import gc
+import tempfile
 from collections.abc import Iterator
 
 import cv2
@@ -1116,14 +1117,14 @@ with gr.Blocks(title="SAM3", theme=Soft(primary_hue="blue", secondary_hue="rose"
             frames_np.append(np.array(img)[:, :, ::-1])
             if (idx + 1) % 60 == 0:
                 gc.collect()
-        out_path = "/tmp/sam3_playback.mp4"
         try:
-            fourcc = cv2.VideoWriter_fourcc(*"mp4v")
-            writer = cv2.VideoWriter(out_path, fourcc, fps, (w, h))
-            for fr_bgr in frames_np:
-                writer.write(fr_bgr)
-            writer.release()
-            return out_path
+            with tempfile.NamedTemporaryFile(suffix=".mp4", delete=False) as out_path:
+                fourcc = cv2.VideoWriter_fourcc(*"mp4v")
+                writer = cv2.VideoWriter(out_path.name, fourcc, fps, (w, h))
+                for fr_bgr in frames_np:
+                    writer.write(fr_bgr)
+                writer.release()
+                return out_path.name
         except Exception as e:
             print(f"Failed to render video with cv2: {e}")
             raise gr.Error(f"Failed to render video: {e}")