2026-05-18-21-20-13 改为逐帧生成结果视频

tests/test_api.py

@@ -80,6 +80,8 @@ def test_segment_video_and_compare_frame(tmp_path: Path):
     result_fps = float(result_capture.get(cv2.CAP_PROP_FPS) or 0)
     result_capture.set(cv2.CAP_PROP_POS_FRAMES, 1)
     ok, carried_overlay = result_capture.read()
+    result_capture.set(cv2.CAP_PROP_POS_FRAMES, second_frame["frame_index"])
+    ok_selected, selected_video_frame = result_capture.read()
     result_capture.release()
     assert result_frames == 18
     assert abs((result_frames / result_fps) - payload["duration"]) < 0.25
@@ -90,6 +92,11 @@ def test_segment_video_and_compare_frame(tmp_path: Path):
         & (carried_overlay[:, :, 0] < 150)
     ).sum()
     assert yellow_pixels > 0
+    assert ok_selected
+    selected_overlay = cv2.imread(str(ROOT / second_frame["overlay_url"].lstrip("/")))
+    assert selected_overlay is not None
+    selected_delta = cv2.absdiff(selected_video_frame, selected_overlay).mean()
+    assert selected_delta < 20.0
 
     with video_path.open("rb") as handle:
         compare = client.post(