每日记录：

查看视频信息

youtube-dl -F https://www.youtube.com/watch?v=uOvWsdi7L80

打印如下结果

139          m4a        audio only DASH audio   52k , m4a_dash container, mp4a.40.5@ 48k (22050Hz)
251          webm       audio only DASH audio  116k , webm_dash container, opus @160k (48000Hz)   
278          webm       256x144    DASH video   95k , webm_dash container, vp9, 25fps, video only
160          mp4        256x144    DASH video  108k , mp4_dash container, avc1.4d400b, 25fps, video only
242          webm       426x240    DASH video  220k , webm_dash container, vp9, 25fps, video only
133          mp4        426x240    DASH video  242k , mp4_dash container, avc1.4d400c, 25fps, video only
243          webm       640x360    DASH video  405k , webm_dash container, vp9, 25fps, video only
244          webm       854x480    DASH video  752k , webm_dash container, vp9, 25fps, video only
136          mp4        1280x720   DASH video 1108k , mp4_dash container, avc1.64001f, 25fps, video only
135          mp4        854x480    DASH video 1155k , mp4_dash container, avc1.4d400b, 25fps, video only
247          webm       1280x720   DASH video 1505k , webm_dash container, vp9, 25fps, video only
137          mp4        1920x1080  DASH video 1884k , mp4_dash container, avc1.640028, 25fps, video only
248          webm       1920x1080  DASH video 2646k , webm_dash container, vp9, 25fps, video only
18           mp4        640x360    360p  288k , avc1.42001E, 25fps, mp4a.40.2@ 96k (44100Hz), 106.89MiB
22           mp4        1280x720   720p  657k , avc1.64001F, 25fps, mp4a.40.2@192k (44100Hz) (best)