init

1.py

@@ -0,0 +1,49 @@
+import os
+import subprocess
+import tempfile
+import shutil
+
+# 根目录
+input_dir = r"D:\DESKTOP\2025\44\a1\dataset"  # 替换为你的视频根目录
+video_exts = {".avi", ".mov", ".mkv", ".flv", ".webm", ".wmv", ".mp4",".m4s"}
+
+def convert_and_replace(filepath):
+    ext = os.path.splitext(filepath)[1].lower()
+    if ext not in video_exts:
+        return
+
+    print(f"处理文件: {filepath}")
+
+    # 创建临时输出文件
+    temp_fd, temp_path = tempfile.mkstemp(suffix=".mp4")
+    os.close(temp_fd)  # 不使用 open 的文件描述符
+
+    # ffmpeg 转换命令（保留前30秒，360p，输出mp4）
+    cmd = [
+        "ffmpeg",
+        "-y",
+        "-i", filepath,
+        "-t", "30",
+        "-vf", "scale=-2:480",
+        "-c:v", "libx264",  # 改为 libx265 可使用 H.265
+        "-preset", "slow",
+        "-crf", "18",
+        "-c:a", "aac",
+        "-b:a", "64k",
+        temp_path
+    ]
+
+    try:
+        subprocess.run(cmd, check=True)
+        shutil.move(temp_path, filepath)
+        print(f"已替换: {filepath}")
+    except subprocess.CalledProcessError as e:
+        print(f"失败: {filepath}\n{e}")
+        if os.path.exists(temp_path):
+            os.remove(temp_path)
+
+# 递归遍历处理
+for root, _, files in os.walk(input_dir):
+    for name in files:
+        file_path = os.path.join(root, name)
+        convert_and_replace(file_path)