支持播放器读取内置、外置字幕功能

[MindFollowing]

Please make sure of the following things

• [X] I have read the documentation.
• [X] I'm sure there are no duplicate issues or discussions.
• [X] I'm sure this feature is not implemented.
• [X] I'm sure it's a reasonable and popular requirement.

Description of the feature / 需求描述

Aliyun Video Previewer 支持读取内置、外置字幕 Video支持读取目录结构获取外置字幕文件并挂载

Suggested solution / 实现思路

Aliyun Video Previewer 原生获取视频信息接口中返回了字幕的数据 { "domain_id": "bj29", "drive_id": "369641930", "file_id": "63fd5c3a00f8552bc7694adab4585740cbf8c8bf", "category": "live_transcoding", "video_preview_play_info": { "category": "live_transcoding", "meta": { "duration": 8529.432, "width": 1920, "height": 816 }, "live_transcoding_task_list": [Object object], "live_transcoding_subtitle_task_list": [{ "language": "chi", "status": "finished", "url": "https://ccp-bj29-video-preview.oss-enet.aliyuncs.com/lt/D8FD2361753581E0E54DE9F54E76203690F87D24_3572904023__sha1_bj29/subtitle/chi_0.vtt" }, { "language": "eng", "status": "finished", "url": "https://ccp-bj29-video-preview.oss-enet.aliyuncs.com/lt/D8FD2361753581E0E54DE9F54E76203690F87D24_3572904023__sha1_bj29/subtitle/eng_0.vtt?" }] } }

Video 需要考虑将srt, ssa, ass 等文件转换成vtt格式后进行挂载

Additional context / 附件

No response