版本：
文件：
- https://cdn.bootcdn.net/ajax/libs/ffmpeg-core/0.12.6/esm/ffmpeg-core.js
- https://cdn.bootcdn.net/ajax/libs/ffmpeg-core/0.12.6/esm/ffmpeg-core.min.js
- https://cdn.bootcdn.net/ajax/libs/ffmpeg-core/0.12.6/umd/ffmpeg-core.js
- https://cdn.bootcdn.net/ajax/libs/ffmpeg-core/0.12.6/umd/ffmpeg-core.min.js