fix gradio cache_examples None output crash

app.py

@@ -27,6 +27,15 @@ import numpy as np
 import cv2
 import gradio as gr
 import onnxruntime as ort
+
+# Workaround: Gradio cache_examples bug with None outputs.
+# CSVLogger.flag() writes "" for None, read_from_flag("") calls json.loads("") -> crash.
+_original_read_from_flag = gr.components.Component.read_from_flag
+def _patched_read_from_flag(self, payload):
+    if payload is None or (isinstance(payload, str) and payload.strip() == ""):
+        return None
+    return _original_read_from_flag(self, payload)
+gr.components.Component.read_from_flag = _patched_read_from_flag
 from huggingface_hub import hf_hub_download
 
 cv2.setNumThreads(2)
@@ -495,6 +504,10 @@ def process_video(video_path, resolution, despill_val, mask_mode,
 # Gradio UI
 # ---------------------------------------------------------------------------
 
+def process_example(video_path, resolution, despill, mask_mode, despeckle, despeckle_size, output_mode):
+    return process_video(video_path, resolution, despill, mask_mode, despeckle, despeckle_size, output_mode)
+
+
 if HAS_CUDA:
     DESCRIPTION = "# CorridorKey Green Screen Matting\nRemove green backgrounds from video. Based on [CorridorKey](https://www.youtube.com/watch?v=3Ploi723hg4) by Corridor Digital. GPU mode: max {max_dur}s / {max_frames} frames.".format(max_dur=MAX_DURATION_GPU, max_frames=MAX_FRAMES)
 else:
@@ -559,7 +572,11 @@ with gr.Blocks(title="CorridorKey") as demo:
             ["examples/corridor_greenscreen_demo.mp4", "1024", 5, "Hybrid (auto)", True, 400, "Composite on checkerboard (MP4)"],
         ],
         inputs=[input_video, resolution, despill_slider, mask_mode, despeckle_check, despeckle_size, output_mode],
-        label="Examples"
+        outputs=[output_video, output_file, status_text],
+        fn=process_example,
+        cache_examples=True,
+        cache_mode="lazy",
+        label="Examples (click to load)"
     )
 
     process_btn.click(