在python脚本中使用youtube-dl仅从youtube视频下载音频
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download only audio from youtube video using youtube-dl in python script
提问by lollercoaster
There's a fewpostson downloading audiofrom YouTube using youtube-dl, but none of them are concrete or too helpful. I'm wondering what the best way to do it from a Python script is.
有一些关于使用从 YouTube下载音频的帖子，但没有一个是具体的或太有帮助。我想知道从 Python 脚本执行此操作的最佳方法是什么。youtube-dl
For example, here's the README example for downloading videos:
例如，这里是下载视频的 README 示例：
import youtube_dl
ydl_opts = {}
with youtube_dl.YoutubeDL(ydl_opts) as ydl:
ydl.download(['http://www.youtube.com/watch?v=BaW_jenozKc'])
Obviously if you just care about the audio, you'd rather not download the whole video...
显然，如果你只关心音频，你宁愿不下载整个视频......
The youtube-dlsource is only so helpful (ie, not very).
在YouTube的-DL源仅仅是如此的帮助（即不太）。
Any suggestions how to script this?
任何建议如何编写脚本？
采纳答案by phihag
Read on in the developer instructionsfor an amended example:
阅读开发人员说明以获取修改后的示例：
from __future__ import unicode_literals
import youtube_dl
ydl_opts = {
'format': 'bestaudio/best',
'postprocessors': [{
'key': 'FFmpegExtractAudio',
'preferredcodec': 'mp3',
'preferredquality': '192',
}],
}
with youtube_dl.YoutubeDL(ydl_opts) as ydl:
ydl.download(['http://www.youtube.com/watch?v=BaW_jenozKc'])
This will download an audio file if possible/supported. If the file is not mp3 already, the downloaded file be converted to mp3 using ffmpegor avconv. For more information, refer to the formatand postprocessorsdocumentation entries in a current version of youtube-dl.
如果可能/支持，这将下载音频文件。如果文件还不是 mp3，则使用ffmpeg或avconv将下载的文件转换为 mp3 。有关更多信息，请参阅youtube-dl 当前版本中的format和postprocessors文档条目。
回答by Pheon
Use postprocessorsargument. The list of all the available postprocessors can be found here.
使用postprocessors参数。可以在此处找到所有可用后处理器的列表。
If you want to pass additional ffmpegor avconvoptions, which are not included in youtube-dllibrary (like audio bitrate - -ar <BR>in ffmpeg), add postprocessor_argsas a list.
如果要传递库中未包含的其他ffmpeg或avconv选项youtube-dl（如音频比特率 - -ar <BR>in ffmpeg），请添加postprocessor_args为列表。
You can also prefer ffmpegover avconvsetting prefer_ffmpegto True.
你也可以喜欢ffmpeg在avconv设置prefer_ffmpeg到True。
And to keep both original and converted audio file set 'keepvideo'to True.
并将原始和转换后的音频文件设置'keepvideo'为True.
For example:
例如：
from __future__ import unicode_literals
import youtube_dl
ydl_opts = {
'format': 'bestaudio/best',
'postprocessors': [{
'key': 'FFmpegExtractAudio',
'preferredcodec': 'wav',
'preferredquality': '192'
}],
'postprocessor_args': [
'-ar', '16000'
],
'prefer_ffmpeg': True,
'keepvideo': True
}
with youtube_dl.YoutubeDL(ydl_opts) as ydl:
ydl.download(['http://www.youtube.com/watch?v=BaW_jenozKc'])
The list of all the available options is in the documentation. You can read ffmpeg posprocessor's code here.
所有可用选项的列表在文档中。您可以在此处阅读 ffmpeg 后处理器的代码。
And a less complex example is in their GitHub README.
一个不太复杂的例子在他们的 GitHub README 中。
