first commit

backend/app/utils/video_helper.py

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+import subprocess
+import os
+import uuid
+
+
+def generate_screenshot(video_path: str, output_dir: str, timestamp: int, index: int) -> str:
+    """
+    使用 ffmpeg 生成截图，返回生成图片路径
+    """
+    os.makedirs(output_dir, exist_ok=True)
+    ids=str(uuid.uuid4())
+    output_path = os.path.join(output_dir, f"screenshot_{str(index)+ids}.jpg")
+
+    command = [
+        "ffmpeg",
+        "-ss", str(timestamp),
+        "-i", video_path,
+        "-frames:v", "1",
+        "-q:v", "2",  # 图像质量
+        output_path,
+        "-y"  # 覆盖
+    ]
+
+    subprocess.run(command, stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL)
+    return output_path
+