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Starting from 1080p resolution YouTube has separate audio and video tracks. In the following example youtube-dl considers 1280x720 stream (22) as the best because higher resolution video lacks audio track.
format code extension resolution note
249 webm audio only DASH audio 51k , opus @ 50k (48000Hz), 709.40KiB
250 webm audio only DASH audio 71k , opus @ 70k (48000Hz), 956.67KiB
171 webm audio only DASH audio 112k , vorbis@128k (44100Hz), 1.49MiB
140 m4a audio only DASH audio 127k , m4a_dash container, mp4a.40.2@128k (44100Hz), 1.74MiB
251 webm audio only DASH audio 140k , opus @160k (48000Hz), 1.80MiB
278 webm 256x144 DASH video 104k , webm container, vp9, 30fps, video only, 1.32MiB
160 mp4 256x144 DASH video 116k , avc1.4d400c, 30fps, video only, 1.53MiB
242 webm 426x240 DASH video 255k , vp9, 30fps, video only, 3.04MiB
133 mp4 426x240 DASH video 256k , avc1.4d4015, 30fps, video only, 3.37MiB
243 webm 640x360 DASH video 490k , vp9, 30fps, video only, 5.57MiB
134 mp4 640x360 DASH video 645k , avc1.4d401e, 30fps, video only, 7.85MiB
244 webm 854x480 DASH video 910k , vp9, 30fps, video only, 10.19MiB
135 mp4 854x480 DASH video 1170k , avc1.4d401f, 30fps, video only, 14.50MiB
247 webm 1280x720 720p 1550k , vp9, 30fps, video only, 20.09MiB
136 mp4 1280x720 720p 2331k , avc1.4d401f, 30fps, video only, 27.85MiB
302 webm 1280x720 DASH video 2731k , vp9, 60fps, video only, 34.08MiB
248 webm 1920x1080 1080p 2819k , vp9, 30fps, video only, 35.25MiB
298 mp4 1280x720 DASH video 3483k , avc1.4d4020, 60fps, video only, 41.24MiB
137 mp4 1920x1080 1080p 4393k , avc1.640028, 30fps, video only, 50.39MiB
303 webm 1920x1080 DASH video 4488k , vp9, 60fps, video only, 56.82MiB
299 mp4 1920x1080 DASH video 5889k , avc1.64002a, 60fps, video only, 70.59MiB
271 webm 2560x1440 1440p 9105k , vp9, 30fps, video only, 110.54MiB
264 mp4 2560x1440 DASH video 9401k , avc1.640032, 30fps, video only, 101.08MiB
308 webm 2560x1440 DASH video 13802k , vp9, 60fps, video only, 157.70MiB
313 webm 3840x2160 2160p 18658k , vp9, 30fps, video only, 232.08MiB
266 mp4 3840x2160 DASH video 23285k , avc1.640033, 30fps, video only, 269.17MiB
315 webm 3840x2160 DASH video 27682k , vp9, 60fps, video only, 345.88MiB
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)
Can the program "merge" audio and video? If not, can the process be automated with FFmpeg?
UPDATE: I have accidentally used youtube-dl -f best [URL] command when only youtube-dl [URL] is needed. FFmpeg does indeed merge the tracks by default
user598527
Posted 2017-02-14T19:42:57.210
Reputation: 2 399
Without forcing, do I have to download both video and audio separately? – user598527 – 2017-02-14T20:49:02.640
@user598527 Yes, I think that's your only option. You can easily merge later with ffmpeg:
ffmpeg -i <video> -i <audio> -c copy -map 0:v -map 1:a output.mkv– slhck – 2017-02-14T21:12:46.977Yes, but you can add
– jaimeMF – 2017-02-14T22:51:40.147-f bestvideo+bestaudio/bestto your configuration file to always use that option.@slhck: Is changing the file format necessary? – user598527 – 2017-02-15T11:57:27.713
1@user598527 Not necessarily, but some codecs cannot be used in all containers. For example, VP9 video and Opus audio cannot be saved in MP4, whereas MKV can store more or less everything. – slhck – 2017-02-15T14:53:58.087