[BUG] ios把视频下载到$dirpath文件夹下面，播放本地视频失败

[tudosxxx]

Describe the bug android可以播放。ios就失败。 What attempts have you made to resolve this error ? 为了解决这个问题你有什么尝试？ 换成网络播放可以。

To Reproduce 问题的复现步骤 Steps to reproduce the behavior:

1. Go to '...'
2. Click on '....'
3. Scroll down to '....'
4. See error

Expected behavior A clear and concise description of what you expected to happen. 描述清楚你希望的运行结果是什么

Screenshots If applicable, add screenshots to help explain your problem. 如果截图有助于对此问题的理解，一定要附上截图

fijkplayer version Which version you used. 用了什么版本的 fijkplayer

Smartphone (please complete the following information): 什么手机设备和系统版本？

• Device: [e.g. iPhone6]
• OS: [e.g. iOS8.1]

Additional context Add any other context about the problem here. 其他有关此问题的内容