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Also known as itag or format codes and way back they could be specified with the fmt parameter (e.g. &fmt=22).
Depending on the age and/or popularity of the video, not all formats will be available.
DASH video
Resolution
AV1 HFR
AV1
VP9.2 HDR HFR
VP9 HFR
VP9
H.264 HFR
H.264
MP4
MP4
WebM
WebM
WebM
MP4
MP4
4320p
402, 571
272
(138)
2160p
401
337
315
313
(266)
1440p
400
336
308
271
(264)
1080p
399
335
303
248
299
137
720p
398
334
302
247
298
136
480p
397
333
244
135
360p
396
332
243
134
240p
395
331
242
133
144p
394
330
278
160
Non-HFR variants are limited to 30 FPS, HFR to 60 FPS
Same IDs are reused for 3D and Surround (360°) videos, according to their internal resolution
H.264 variants for 1440p and higher only exist for 360° videos anymore
At the moment, AV1 variants only exist for very popular videos
AV1 variants can be HDR (then no non-HDR AV1 variants are offered)
Regarding 4320p AV1: Sometimes both formats exist for the same video. 571 has roughly 50% higher bitrate than 402
DASH audio
Code
Container
Audio Codec
Audio Bitrate
Channels
Still offered?
139
MP4
AAC (?)
48 Kbps
Stereo (2)
?, YT Music
140
MP4
AAC (LC)
128 Kbps
Stereo (2)
Yes, YT Music
(141)
MP4
AAC (LC)
256 Kbps
Stereo (2)
No, YT Music*
171
WebM
Vorbis
128 Kbps
Stereo (2)
No
172
WebM
Vorbis
256 Kbps
Stereo (2)
No
249
WebM
Opus
(VBR) ~50 Kbps
Stereo (2)
Yes
250
WebM
Opus
(VBR) ~70 Kbps
Stereo (2)
Yes
251
WebM
Opus
(VBR) <=160 Kbps
Stereo (2)
Yes
256
MP4
AAC (HE v1)
192 Kbps
Surround (5.1)
Rarely
258
MP4
AAC (LC)
384 Kbps
Surround (5.1)
Rarely
Surround audio can be found on some demo videos
YT Music: These formats are offered on Youtube Music. Format 141 is only available to Premium users with High Quality option
Legacy (non-DASH)
Code
Container
Video Codec
Video Res.
Audio Codec
Audio Bitrate
Channels
Still offered?
18
MP4
H.264 (Baseline, L3.0)
360p
AAC (LC)
96 Kbps
Stereo (2)
Yes, GDrive
(59)
MP4
H.264 (Main, L3.1)
480p
AAC (LC)
128 Kbps
Stereo (2)
No, GDrive
22
MP4
H.264 (High, L3.1)
720p
AAC (LC)
192 Kbps
Stereo (2)
Mostly*, GDrive
(37)
MP4
H.264 (High, L4.0)
1080p
AAC (LC)
128 Kbps
Stereo (2)
No, GDrive
43
WebM
VP8
360p
Vorbis
128 Kbps
Stereo (2)
No
Always limited to 30 FPS
GDrive: These formats are offered for Google Drive video previews. Note that the video player on GDrive displays incorrect codecs on rightclick -> stats
Regarding format 22: This format is available for most videos, except music and music videos (not limited to official music channels!)
Livestreams (non-DASH)
Code
Container
Video Codec
Video Res.
Audio Codec
Audio Bitrate
Still offered?
91
MPEG-TS (HLS)
H.264 (Baseline, L1.1)
144p
AAC (HE v1)
48 Kbps
Yes
92
MPEG-TS (HLS)
H.264 (Main, L2.1)
240p
AAC (HE v1)
48 Kbps
Yes
93
MPEG-TS (HLS)
H.264 (Main, L3.0)
360p
AAC (LC)
128 Kbps
Yes
94
MPEG-TS (HLS)
H.264 (Main, L3.1)
480p
AAC (LC)
128 Kbps
Yes
95
MPEG-TS (HLS)
H.264 (Main, L3.1)
720p
AAC (LC)
256 Kbps
Yes
96
MPEG-TS (HLS)
H.264 (High, L4.0)
1080p
AAC (LC)
256 Kbps
Yes
300
MPEG-TS (HLS)
H.264 (Main, L3.2)
HFR 720p
AAC (LC)
128 Kbps
Yes
301
MPEG-TS (HLS)
H.264 (High, L4.2)
HFR 1080p
AAC (LC)
128 Kbps
Yes
Non-HFR variants are limited to 30 FPS, HFR to 60 FPS
Non-HFR variants for 720p and 1080p may not be offered if HFR is available
Livestreams are also offered through DASH video (H.264) and DASH audio (AAC) streams
Template youtube-dl formats
For archiving videos, will only choose combinations that fit either WebM (VP8/VP9+Vorbis/Opus) or MP4 (H.264+AAC)
