Using video_player to display a video from a given starting position

[tusike]

Hi!

I'm trying to create a simple app where I can iterate between video clips. Each videoClip is described by a file location, a start time, and an end time (Durations). When I switch from one clip to another, I would like the UI to simply show the starting frame of the next video clip. I am attempting to wrap the logic in a bloc design pattern, with a LoadVideo event responsible for this transition. A simplified example of my code for handling this event (with the relevant calls to the video_player functions included) is as follows:

@override
Stream<VideoState> mapEventToState(VideoEvent event) async* {
  final currentState = state;
  switch (event.runtimeType) {
    case LoadVideo:

      // get video player controller corresponding to the input file
      final videoClip = (event as LoadVideo).videoClip;

      final videoPlayerController = VideoPlayerController.file(File(videoClip.fileLocation));

      // wait for initialization
      await videoPlayerController.initialize();

      // seek to starting point of video
      if (videoClip.startTime != null) {
        await videoPlayerController.seekTo(videoClip.startTime);
      }

      // ????
      await Future.delayed(const Duration(milliseconds: 100), () {});

      // update the state such the the UI is rebuilt to show the starting point of the video

      yield VideoLoaded(videoPlayerController);

      return;

  }

}

My issue is that the UI shows the 0th frame of the loaded video for a split second before jumping to the desired frame specified by startTime. It seems that by adding the Future.delayed() line, this can be avoided, but this seems like a hack that is not certain to always work. I don't understand the reason for the described behavior, since I am awaiting every step of seeking to the desired starting frame. 

Can anybody tell me what I am missing, and what the elegant solution would be to make the transition between loaded videos seamless?

Thanks for any help! 

-Tusike

[tusike]

Any thoughts on this? I wasn't able to figure out anything yet. Since delaying execution seems to resolve the issue, it seems as if I should be awaiting something before yielding the new state. However, I cannot figure out what is still running in the background that I should await.