New question

[dreamchonghua]

URL:https://www.youtube.com/watch?v=O8_cwFch7f0
Please tell me how to parse and merge this link. Thank you.
I want WEBM video format. Thank you.
How can I download videos in WebM format with audio? Thank you.

H:\youtube>youtube-dl -F https://www.youtube.com/watch?v=O8_cwFch7f0 --proxy "127.0.0.1:1080"
[youtube] O8_cwFch7f0: Downloading webpage
[youtube] O8_cwFch7f0: Downloading video info webpage
[info] Available formats for O8_cwFch7f0:
format code extension resolution note
140 m4a audio only DASH audio 130k , m4a_dash container, mp4a.40.2@128k, 813.70KiB
278 webm 82x144 144p 37k , webm container, vp9, 30fps, video only, 216.06KiB
160 mp4 82x144 144p 39k , avc1.4d400b, 30fps, video only, 238.68KiB
242 webm 136x240 144p 75k , vp9, 30fps, video only, 452.30KiB
133 mp4 136x240 144p 83k , avc1.4d400c, 30fps, video only, 512.82KiB
243 webm 202x360 240p 140k , vp9, 30fps, video only, 814.01KiB
134 mp4 202x360 240p 195k , avc1.4d400d, 30fps, video only, 1.11MiB
244 webm 270x480 240p 232k , vp9, 30fps, video only, 1.33MiB
135 mp4 270x480 240p 349k , avc1.4d4015, 30fps, video only, 2.00MiB
247 webm 406x720 360p 454k , vp9, 30fps, video only, 2.41MiB
136 mp4 406x720 360p 701k , avc1.4d401e, 30fps, video only, 4.03MiB
248 webm 608x1080 480p 752k , vp9, 30fps, video only, 3.91MiB
137 mp4 608x1080 480p 1437k , avc1.64001f, 30fps, video only, 7.77MiB
271 webm 810x1440 720p 1919k , vp9, 30fps, video only, 10.74MiB
313 webm 1080x1920 1080p 3697k , vp9, 30fps, video only, 19.73MiB
18 mp4 202x360 small 354k , avc1.42001E, mp4a.40.2@ 96k (44100Hz), 2.17MiB (best)

Checklist

• I'm asking a question
• I've looked through the README and FAQ for similar questions
• I've searched the bugtracker for similar questions including closed ones

Question

WRITE QUESTION HERE