Question about available formats

[Coco1905]

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Hello everybody,

I am using embedded youtube-dl to extract all my audio files with the same format.

For the moment, I ask them to have an sample rate of 44.1kHz with
'format': 'bestaudio[asr=48000]/best'
in the options.

The best for me would have been an asr of 48kHz. But, when I try with the same line, but with asr=48000, all the files have not the same sample rate that I want. Indeed, when I use
'listformats': 'True'
the 171 is always available (44.1kHz) but not one with 48kHz.

So, I am wondering : how the available formats are chosen ? Does it come from youtube directly ? (I am only downloading youtube videos.)

Thanks in advance!

[dstftw]

https://github.com/rg3/youtube-dl#format-selection