下载 1080p 视频
官网: https://rg3.github.io/youtube-dl
文档：https://github.com/rg3/youtube-dl/blob/master/README.md#readme
安装：
我用的是 macOS
brew install youtube-dl
获取资源列表
192:~ boitx$ youtube-dl --proxy "https://127.0.0.1:1087/" -F https://www.youtube.com/watch?v=d58VJ-sC1uY
[youtube] d58VJ-sC1uY: Downloading webpage
[youtube] d58VJ-sC1uY: Downloading video info webpage
[youtube] d58VJ-sC1uY: Extracting video information
[youtube] d58VJ-sC1uY: Downloading js player vflUnLBiU
[youtube] d58VJ-sC1uY: Downloading MPD manifest
[info] Available formats for d58VJ-sC1uY:
format code extension resolution note
139 m4a audio only DASH audio 48k , m4a_dash container, mp4a.40.5@ 48k (22050Hz), 1.08MiB
249 webm audio only DASH audio 53k , opus @ 50k, 1.13MiB
250 webm audio only DASH audio 72k , opus @ 70k, 1.48MiB
140 m4a audio only DASH audio 128k , m4a_dash container, mp4a.40.2@128k (44100Hz), 2.89MiB
171 webm audio only DASH audio 138k , vorbis@128k, 2.82MiB
251 webm audio only DASH audio 141k , opus @160k, 2.94MiB
278 webm 256x144 144p 116k , webm container, vp9, 12fps, video only, 2.14MiB
160 mp4 256x144 DASH video 120k , avc1.4d400c, 24fps, video only, 2.51MiB
133 mp4 426x240 DASH video 252k , avc1.4d4015, 24fps, video only, 5.60MiB
242 webm 426x240 240p 258k , vp9, 24fps, video only, 4.88MiB
243 webm 640x360 360p 474k , vp9, 24fps, video only, 8.91MiB
134 mp4 640x360 DASH video 641k , avc1.4d401e, 24fps, video only, 10.54MiB
244 webm 854x480 480p 886k , vp9, 24fps, video only, 15.97MiB
135 mp4 854x480 DASH video 1171k , avc1.4d401e, 24fps, video only, 20.15MiB
247 webm 1280x720 720p 1777k , vp9, 24fps, video only, 31.18MiB
136 mp4 1280x720 DASH video 2336k , avc1.4d401f, 24fps, video only, 37.58MiB
248 webm 1920x1080 1080p 3152k , vp9, 24fps, video only, 56.03MiB
137 mp4 1920x1080 DASH video 4383k , avc1.640028, 24fps, video only, 65.62MiB
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)
下载 1080p 视频
youtube-dl --proxy "https://127.0.0.1:1087/" -f 137+140 https://www.youtube.com/watch?v=d58VJ-sC1uY
结果是两份文件：m4a,mp4.
现在需要把这两个文件合并起来，才能得到最终的视频。幸运的是我们可以通过 FFmpeg 来自动完成
安装 FFmpeg
192:~ boitx$ brew install ffmpeg
Updating Homebrew...
==> Auto-updated Homebrew!
Updated 1 tap (homebrew/core).
No changes to formulae.
==> Downloading https://homebrew.bintray.com/bottles/ffmpeg-3.3.4.sierra.bottle.
Already downloaded: /Users/boitx/Library/Caches/Homebrew/ffmpeg-3.3.4.sierra.bottle.tar.gz
==> Pouring ffmpeg-3.3.4.sierra.bottle.tar.gz
Error: The `brew link` step did not complete successfully
The formula built, but is not symlinked into /usr/local
Could not symlink lib/pkgconfig/libavcodec.pc
/usr/local/lib/pkgconfig is not writable.
You can try again using:
brew link ffmpeg
==> Summary
/usr/local/Cellar/ffmpeg/3.3.4: 243 files, 50.8MB
Error: The brew link` step did not complete successfully The formula built, but is not symlinked into /usr/local Could not symlink lib/pkgconfig/libavcodec.pc /usr/local/lib/pkgconfig is not writable.
192:~ boitx$ sudo chown -R boitx /usr/local/lib/pkgconfig
192:~ boitx$ brew install ffmpeg
Warning: ffmpeg 3.3.4 is already installed, it's just not linked.
You can use `brew link ffmpeg` to link this version.
192:~ boitx$ brew link ffmpeg
Linking /usr/local/Cellar/ffmpeg/3.3.4... 81 symlinks created
总结
说说费时的事吧： 明明已经安装了 FFmpeg ，下载的时候总是提示没有安装 FFmpeg ， 不会自动合并 m4a 音频文件和 mp4 视频文件。
卸载安装重复了多次，仍然没有解决。太折腾了。