这些行是什么:#xywh=0,0,160,90 在 vtt 文件中表示缩略图?
WEBVTT 00:00.000 --> 00:05.000
/assets/thumbnails.jpg#xywh=0,0,160,90
00:05.000 --> 00:10.000
/assets/preview2.jpg#xywh=160,0,320,90
00:10.000 --> 00:15.000
/assets/preview3.jpg#xywh=0,90,160,180
00:15.000 --> 00:20.000
/assets/preview4.jpg#xywh=160,90,320,180
谢谢。