html5-video

直接传了一个mp3文件路径，发现video标签并未赋值上去，poster也没有了

Expected Behavior【期望行为】

希望能支持audio文件，谢谢

Environment 【相关环境】

版本：0.11.0

⚬ PROBLEM:

Some content creators make videos where the aspect ratio changes during the video. When their video itself has a different aspect ratio than the monitor of the viewer, the "transparent background" option creates two differently colored bars, which is distracting in my opinion.

Example:
![Example](https://user-images.githubusercontent.com/41735601/114696189-b0747780-9d1c-11eb-9f

Apparently the parsing process has some kind of error, if a sprite is specified in the VTT file relative to the VTT file, then the player loads the sprite relative to the root of the site

In the case that is

Intention is to stop playback and reset the playhead back to the beginning.
I started off dispatching two actions:

dispatch(actions.setPlayHead(id, .1));
dispatch(actions.pause(id));

This worked the first time I called it but failed subsequent times. See my other issue about this: jplayer/react-jPlayer#13

What ended up working great:
`dispatch(action