### 使用 Python3 解密并下载 M3U8 文件 M3U8 是一种播放列表文件格式，通常用于 HLS (HTTP Live Streaming) 流媒体传输协议。要解密并下载 M3U8 文件中的视频片段，可以按照以下方法实现。 #### 安装依赖库 为了处理 M3U8 和 AES 加密相关内容，需要安装 `requests` 和 `m3u8` 库以及 `pycryptodome` 来支持加密操作： ```bash pip install requests m3u8 pycryptodome ``` #### 下载和解密 M3U8 文件的代码示例 下面是一个完整的 Python 脚本，展示了如何解析、下载并解密 M3U8 文件及其对应的 TS 片段[^1]： ```python import os import sys from Crypto.Cipher import AES import requests import m3u8 from pathlib import Path def fetch_key(uri, headers=None): response = requests.get(uri, headers=headers) key_content = response.content return key_content def decrypt_ts_file(key, iv_hex, input_path, output_path): with open(input_path, 'rb') as encrypted_file: cipher_text = encrypted_file.read() iv_bytes = bytes.fromhex(iv_hex.lstrip('0x')) aes_cipher = AES.new(key, AES.MODE_CBC, iv=iv_bytes) decrypted_data = aes_cipher.decrypt(cipher_text) unpad_length = ord(decrypted_data[-1:]) clear_data = decrypted_data[:-unpad_length] with open(output_path, "wb") as f: f.write(clear_data) def download_m3u8_playlist(url, base_url="", save_dir="./downloads"): playlist = m3u8.load(url) if not playlist.is_variant: raise ValueError("The provided URL does not point to a variant playlist.") best_quality_stream = max(playlist.data['playlists'], key=lambda x: int(x['stream_info']['bandwidth'])) stream_url = best_quality_stream['uri'] full_stream_url = urljoin(base_url, stream_url) ts_segments = [] segment_list = [] master_playlist = m3u8.load(full_stream_url) for seg in master_playlist.segments: absolute_uri = urljoin(full_stream_url, seg.uri) local_filename = os.path.join(save_dir, str(Path(seg.uri).name)) r = requests.get(absolute_uri) with open(local_filename, 'wb') as fd: fd.write(r.content) if seg.key and seg.key.method.lower() == 'aes-128': key = fetch_key(seg.key.uri) iv_hex = hex(int(seg.key.iv or 0))[2:].zfill(32)[:32] decrypted_name = f"{Path(local_filename).stem}_decrypted{Path(local_filename).suffix}" decrypt_ts_file(key, iv_hex, local_filename, decrypted_name) os.remove(local_filename) local_filename = decrypted_name ts_segments.append((seg.duration, local_filename)) combined_video_output = os.path.join(save_dir, "combined.mp4") command = ["ffmpeg", "-i", f"concat:{'|'.join([str(ts[1]) for ts in ts_segments])}", "-c", "copy", combined_video_output] subprocess.run(command) download_m3u8_playlist("http://example.com/path/to/your.m3u8") ``` 此脚本会自动检测最佳质量流，并依次下载每个分片，在必要时对其进行解密，最后通过 FFmpeg 将这些片段组合成单个 MP4 文件[^1]。