Python程序：从FTP服务器下载Opus文件和TXT文件，并根据TXT文件中的数字解码和合并Opus文件为WAV文件

使用Python编写程序，从FTP服务器下载Opus文件和TXT文件，根据TXT文件中的数字对Opus文件进行解码并合并成一个WAV文件。\n\npython\nimport os\nimport ftplib\nfrom pydub import AudioSegment\n\ndef download_file(ftp, filename):\n with open(filename, 'wb') as file:\n ftp.retrbinary('RETR ' + filename, file.write)\n\ndef decode_opus(opus_file, output_file):\n os.system('opusdec {} {}'.format(opus_file, output_file))\n\ndef merge_wav(opus_files, output_file):\n audio_segments = []\n for opus_file in opus_files:\n audio_segments.append(AudioSegment.from_file(opus_file, format='wav'))\n combined = audio_segments[0]\n for segment in audio_segments[1:]:\n combined = combined + segment\n combined.export(output_file, format='wav')\n\ndef main():\n ftp_host = 'ftp.example.com'\n ftp_username = 'username'\n ftp_password = 'password'\n ftp_folder = 'folder/'\n\n ftp = ftplib.FTP(ftp_host)\n ftp.login(ftp_username, ftp_password)\n ftp.cwd(ftp_folder)\n\n # Download opus and txt files\n download_file(ftp, 'audio.opus')\n download_file(ftp, 'numbers.txt')\n\n # Decode opus file\n decode_opus('audio.opus', 'audio.wav')\n\n # Read numbers from txt file\n with open('numbers.txt', 'r') as file:\n numbers = file.read().splitlines()\n\n # Merge opus files based on numbers\n opus_files = ['audio_{}.opus'.format(number) for number in numbers]\n merge_wav(opus_files, 'output.wav')\n\n # Clean up temporary files\n os.remove('audio.opus')\n os.remove('numbers.txt')\n for opus_file in opus_files:\n os.remove(opus_file)\n\n ftp.quit()\n\nif __name__ == '__main__':\n main()\n\n\n请注意，您需要安装pydub和ftplib库来运行上述代码。您可以使用以下命令来安装这些库：\n\n\npip install pydub\n\n\n然后，您需要将ftp_host，ftp_username，ftp_password和ftp_folder变量替换为您实际的FTP服务器和凭据。程序首先连接到FTP服务器，然后下载audio.opus和numbers.txt文件。接下来，它会使用opusdec命令对audio.opus文件进行解码，并将解码后的文件保存为audio.wav。然后，它会从numbers.txt文件中读取数字，并根据这些数字合并对应的audio_{}.opus文件为一个output.wav文件。最后，它会清理临时文件。