录屏清晰度

[wanghaisheng]

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我目前使用pl的话 默认的录屏 record-video-dir 存在两个问题 1.没法控制起始时间，比如真正打开网页的时候，默认会把加载的空白也录制进来，网络不好就会很长 2.清晰度很受限

其中的track方法能很好的解决上面两个问题，有机会我可以pr一下