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app.py

@@ -78,9 +78,12 @@ def extract_frames(video_path: str, num_frames: int = NUM_FRAMES,
         raise RuntimeError(f"Cannot open video: {video_path}")
 
     fps = cap.get(cv2.CAP_PROP_FPS)
-    cap.set(cv2.CAP_PROP_POS_AVI_RATIO, 1)
-    clip_duration = cap.get(cv2.CAP_PROP_POS_MSEC) / 1000.0
-    cap.set(cv2.CAP_PROP_POS_MSEC, 0)
+    n_total = cap.get(cv2.CAP_PROP_FRAME_COUNT)
+    clip_duration = (n_total / fps) if (fps and fps > 0 and n_total and n_total > 0) else 0.0
+    if clip_duration <= 0:  # some muxers report no frame count — seek to the end instead
+        cap.set(cv2.CAP_PROP_POS_AVI_RATIO, 1)
+        clip_duration = cap.get(cv2.CAP_PROP_POS_MSEC) / 1000.0
+        cap.set(cv2.CAP_PROP_POS_MSEC, 0)
     if clip_duration <= 0 or fps <= 0:
         cap.release()
         return [], 0.0
@@ -298,7 +301,7 @@ CSS = """
 .dark .gradio-container { color: var(--body-text-color); }
 """
 
-with gr.Blocks(theme=gr.themes.Citrus(), css=CSS) as demo:
+with gr.Blocks() as demo:
     with gr.Column(elem_id="col-container"):
         gr.Markdown(
             """
@@ -327,9 +330,9 @@ with gr.Blocks(theme=gr.themes.Citrus(), css=CSS) as demo:
                                                label="Max new tokens")
 
             with gr.Column(scale=1):
-                answer_out = gr.Textbox(label="Answer + grounded evidence", lines=12, show_copy_button=True)
-                timeline_out = gr.Image(label="Evidence timeline", height=140, show_download_button=False)
-                json_out = gr.Textbox(label="Model output (JSON)", lines=6, show_copy_button=True)
+                answer_out = gr.Textbox(label="Answer + grounded evidence", lines=12, buttons=["copy"])
+                timeline_out = gr.Image(label="Evidence timeline", height=140, buttons=[])
+                json_out = gr.Textbox(label="Model output (JSON)", lines=6, buttons=["copy"])
 
         gr.Markdown(
             """
@@ -364,4 +367,4 @@ with gr.Blocks(theme=gr.themes.Citrus(), css=CSS) as demo:
         api_name="answer_submit",
     )
 
-demo.launch(mcp_server=True)
+demo.launch(theme=gr.themes.Citrus(), css=CSS, mcp_server=True)