Results 3 issues of longgong

When the resource is opened without automatic playback, the widget displays a black screen. How to display the first frame content? like this ![Snipaste_2022-09-06_11-47-09](https://user-images.githubusercontent.com/5051456/188542987-35991f62-429c-4c8e-8699-3069f4cb5b78.png) the code as follows ``` Video(...

When the open method is not set to autoplay, the resource duration cannot be obtained. How can I get the resource duration before the playback starts?

bug

The following error occurs when playing audio to the end. On win10 system. [ffmpeg/audio] mp3float: Header missing Error decoding audio. url: https://gcdncs.101.com/v0.1/static/karaoke_app/69090.mp3