C# 解密m3u8 ts视频文件为mp4

代码：

 try
 {
     //读取的加密视频ts文件路径
     byte[] encodeBuffer = File.ReadAllBytes("C:\\Users\\admin\\Downloads\\322251.ts");
     /// A216DF0DA0082028163781ECC258BA5B代表winhex看到的字符串  32734893fb097a767c9ea903936a6d8b代表m3u8文件中的iv偏移
     byte[] decodeBuffer = Decrypt(encodeBuffer, "A216DF0DA0082028163781ECC258BA5B", "32734893fb097a767c9ea903936a6d8b");
     //将ts视频文件解密mp4文件保存
     File.WriteAllBytes("C:\\Users\\admin\\Downloads\\322251解密后的视频.mp4", decodeBuffer);
 }
 catch (Exception ex)
 {
     Debug.WriteLine(ex.Message);
     Console.WriteLine(ex.Message);
 }

拿到key文件对应的key

 拿到key 拿到偏移量iv

代码

        public static byte[] Decrypt(byte[] cipherTextBytes, string key16, string iv16)
        {   // 确保字符串长度是偶数
            if (key16.Length % 2 == 1)
            {
                throw new ArgumentException("The hex string length must be even.");
            }
            if (iv16.Length % 2 == 1)
            {
                throw new ArgumentException("The hex string length must be even.");
            }

            byte[] buffkey = new byte[key16.Length / 2];
            for (int i = 0; i < key16.Length; i += 2)
            {
                var tempkey = key16.Substring(i, 2);
                buffkey[i / 2] = Convert.ToByte(tempkey, 16);
            }
            byte[] buffiv = new byte[key16.Length / 2];
            for (int i = 0; i < iv16.Length; i += 2)
            {
                var tempkey = iv16.Substring(i, 2);
                buffiv[i / 2] = Convert.ToByte(tempkey, 16);
            }
            // 确保密钥和IV长度正确（128位，即16字节）
            byte[] keyBytes = buffkey.ToArray();
            byte[] ivBytes = buffiv.ToArray();

            // 创建RijndaelManaged对象用于解密
            using (RijndaelManaged aes = new RijndaelManaged())
            {
                aes.Key = keyBytes;
                aes.IV = ivBytes;
                aes.Mode = CipherMode.CBC;
                aes.Padding = PaddingMode.PKCS7;

                // 创建解密器
                ICryptoTransform decryptor = aes.CreateDecryptor(aes.Key, aes.IV);

                // 创建MemoryStream以用于解密
                using (MemoryStream msDecrypt = new MemoryStream(cipherTextBytes))
                {
                    using (CryptoStream csDecrypt = new CryptoStream(msDecrypt, decryptor, CryptoStreamMode.Read))
                    {
                        // 读取解密后的字节
                        byte[] decryptedBytes = new byte[cipherTextBytes.Length];
                        csDecrypt.Read(decryptedBytes, 0, decryptedBytes.Length);

                        return decryptedBytes;
                    }
                }
            }
        }

写个C#控制台，粘贴程序，修改参数就可以跑了 

附录一张图片