Results 4 issues of wxl

I trained several hundred sequence frames from a single video, and after running it overnight, it's only at 9514/500000.

I trained several hundred sequence frames from a single video, and after running it overnight, it's only at 9514/500000.

![sdasd0231003023923](https://github.com/sczhou/ProPainter/assets/1106791/da951630-8a90-4460-9831-970e2cc6cd5a) ![0231003023848](https://github.com/sczhou/ProPainter/assets/1106791/d4e2ee0d-a620-4393-b786-7ba1cd29f22d)

Do I need to train the optical flow myself for it to be effective?