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Old 3rd February 2019
  #24
youtube-dl will give you information on what audio codecs YouTube is offering:

Code:
$ youtube-dl -F https://www.youtube.com/watch?v=u2dIeM8Tf-E | grep -v 'video only'
[youtube] u2dIeM8Tf-E: Downloading webpage
[youtube] u2dIeM8Tf-E: Downloading video info webpage
[info] Available formats for u2dIeM8Tf-E:
format code  extension  resolution note
249          webm       audio only DASH audio   63k , opus @ 50k, 7.78MiB
250          webm       audio only DASH audio   81k , opus @ 70k, 10.07MiB
140          m4a        audio only DASH audio  130k , m4a_dash container, [email protected], 19.66MiB
171          webm       audio only DASH audio  134k , [email protected], 15.49MiB
251          webm       audio only DASH audio  159k , opus  @
160
k, 18.88MiB
17           3gp        176x144    small   81k , mp4v.20.3, [email protected] 24k (22050Hz), 12.48MiB
36           3gp        320x180    small  225k , mp4v.20.3, mp4a.40.2 (22050Hz), 34.58MiB
43           webm       640x360    medium , vp8.0, [email protected], 95.22MiB
18           mp4        640x360    medium  431k , avc1.42001E, [email protected] 96k (44100Hz), 66.11MiB
22           mp4        1280x720   hd720 1143k , avc1.64001F, [email protected] (44100Hz) (best)
Note the 3gp targets.

I haven't checked this but I assume everything is encoded in CBR?