为此编写应用程序可能有点矫枉过正。现有的工具已经做得非常好，而且很难超越它们的简单性：
wget http://www.youtube.com/get_video.php?video_id=... | ffmpeg -i - audio.mp3
全部完成！
如果您的应用程序随后需要对音频执行一些特殊操作，那么为该部分编写一个应用程序是有意义的。但如果只是输出音频，则将其输出到 ffmpeg 会容易得多。
ffmpeg
Writing an application for this might be overkill. Existing tools already do a pretty good job, and it's hard to beat their simplicity:
All done!
If your application needs to do something special with the audio afterwards, it would make sense to write an app for that part. But for just getting the audio out, shelling out to ffmpeg will be a lot easier.
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为此编写应用程序可能有点矫枉过正。现有的工具已经做得非常好，而且很难超越它们的简单性：
全部完成！
如果您的应用程序随后需要对音频执行一些特殊操作，那么为该部分编写一个应用程序是有意义的。但如果只是输出音频，则将其输出到
ffmpeg会容易得多。Writing an application for this might be overkill. Existing tools already do a pretty good job, and it's hard to beat their simplicity:
All done!
If your application needs to do something special with the audio afterwards, it would make sense to write an app for that part. But for just getting the audio out, shelling out to
ffmpegwill be a lot easier.