问缩小视频文件大小

EN

private async void btnCamera4_Clicked(object sender, EventArgs e)   
{
   var cafNo = entCafNo.Text;
   TimeSpan time = new TimeSpan(0, 0, 0, 20, 0);

   await CrossMedia.Current.Initialize();

   if (!CrossMedia.Current.IsCameraAvailable || !CrossMedia.Current.IsTakeVideoSupported)
   {
      await DisplayAlert("No Camera", "No Camera Available", "Ok");
      return;
   }

   try
   {
       var file = await CrossMedia.Current.TakeVideoAsync(
       new Plugin.Media.Abstractions.StoreVideoOptions
       {
           Name = cafNo + "_VID.mp4",
           CompressionQuality = 0,
           Quality = VideoQuality.Low,
           DesiredLength = time
        });

        entVideoUrl.Text = file.Path;
    }
    catch (Exception ex)
    {
        Crashes.TrackError(ex);
    }
}