`get_batch` hang in some condition. I can provide the reproduce repo.

Please clone this [repo](https://github.com/vipcxj/decord_hang)

It's very strange, using get_batch read some frames cause hanging. I have locate the special frames. I have not found any strange of these frame. I don't know how to debug you project to find the problem. So I create a reop which reproducing the issue. Please help me find the problem.
By the way. the video in the repo have a wrong timestamps, but its may not relate to the issue. Because I have many video with such wrong timestamps work fine.