How to download mp3

[satyamer14i]

I'm unable to locate exactly what I have to do in order to download the mp3 file. I read and noticed that you have to first download m4a and then do local conversio. But how to download m4a? Thanks in advance

[ajmalrasi]

Download m4a audio only files from adaptive_dash_fmt , then use ffmpeg to convert it locally.

[DocSniper]

YouTube does indeed deliver other audio (and video) formats, here an example output of all available formats from "youtube-dl -F [someURL]":

format code	extension	resolution	note
249	webm	audio only	DASH audio 55k , opus @ 50k, 1.47MiB
250	webm	audio only	DASH audio 79k , opus @ 70k, 2.00MiB
140	m4a	audio only	DASH audio 127k , m4a_dash container, mp4a.40.2@128k, 3.70MiB
171	webm	audio only	DASH audio 132k , vorbis@128k, 3.54MiB
251	webm	audio only	DASH audio 156k , opus @160k, 3.96MiB
160	mp4	256x144	144p 112k , avc1.4d400c, 24fps, video only, 2.2MiB
278	webm	256x144	144p 190k , webm container, vp9, 12fps, video only, 2.82MiB
133	mp4	426x240	240p 244k , avc1.4d4015, 24fps, video only, 3.5MiB
242	webm	426x240	240p 274k , vp9, 24fps, video only, 5.39MiB
243	webm	640x360	60p 514k , vp9, 24fps, video only, 9.62MiB
134	mp4	640x360	360p 648k , avc1.4d401e, 24fps, video only, 9.1MiB
244	webm	854x480	480p 880k , vp9, 24fps, video only, 16.35MiB
135	mp4	854x480	480p 1189k , avc1.4d401e, 24fps, video only, 19.02MiB
247	webm	1280x720	720p 1688k , vp9, 24fps, video only, 30.86MiB
136	mp4	1280x720	720p 2354k , avc1.4d401f, 24fps, video only, 34.61MiB
248	webm	1920x1080	1080p 3078k , vp9, 24fps, video only, 58.09MiB
137	mp4	1920x1080	1080p 4429k , avc1.640028, 24fps, video only, 6.57MiB
17	3gp	176x144	small , mp4v.20.3, mp4a.40.2@ 24k
36	3gp	320x180	small , mp4v.20.3, mp4a.40.2
43	webm	640x360	medium , vp8.0, vorbis@128k
18	mp4	640x360	medium , avc1.42001E, mp4a.40.2@ 96k
22	mp4	1280x720	hd720 , avc1.64001F, mp4a.40.2@192k (best)