Nullability of reference types in type of parameter 'sender' of 'void MainWindow.MainWindow_Activated(object sender, EventArgs e)' doesn't match the target delegate 'EventHandler' (possibly because of nullability attributes).

Non-nullable field 'VideoCapture1' must contain a non-null value when exiting constructor. Consider adding the 'required' modifier or declaring the field as nullable.

Because this call is not awaited, execution of the current method continues before the call is completed. Consider applying the 'await' operator to the result of the call.

Nullability of reference types in type of parameter 'sender' of 'void MainWindow.Window_Closing(object sender, CancelEventArgs e)' doesn't match the target delegate 'EventHandler<WindowClosingEventArgs>' (possibly because of nullability attributes).

Dereference of a possibly null reference.

Nullability of reference types in type of parameter 'sender' of 'void MainWindow.cbVideoInputDevice_SelectionChanged(object sender, SelectionChangedEventArgs e)' doesn't match the target delegate 'EventHandler<SelectionChangedEventArgs>' (possibly because of nullability attributes).

Dereference of a possibly null reference.

Nullability of reference types in type of parameter 'sender' of 'void MainWindow.cbVideoInputFormat_SelectionChanged(object sender, SelectionChangedEventArgs e)' doesn't match the target delegate 'EventHandler<SelectionChangedEventArgs>' (possibly because of nullability attributes).

Dereference of a possibly null reference.

Dereference of a possibly null reference.

Nullability of reference types in type of parameter 'sender' of 'void MainWindow.MainWindow_Activated(object sender, EventArgs e)' doesn't match the target delegate 'EventHandler' (possibly because of nullability attributes).

Nullability of reference types in type of parameter 'sender' of 'void MainWindow.MainWindow_Closing(object sender, CancelEventArgs e)' doesn't match the target delegate 'EventHandler<WindowClosingEventArgs>' (possibly because of nullability attributes).

Non-nullable field '_pipeline' must contain a non-null value when exiting constructor. Consider adding the 'required' modifier or declaring the field as nullable.

Non-nullable field '_videoRenderer' must contain a non-null value when exiting constructor. Consider adding the 'required' modifier or declaring the field as nullable.

Non-nullable field '_audioRenderer' must contain a non-null value when exiting constructor. Consider adding the 'required' modifier or declaring the field as nullable.

Non-nullable field '_fileSource' must contain a non-null value when exiting constructor. Consider adding the 'required' modifier or declaring the field as nullable.

Non-nullable field '_tmPosition' must contain a non-null value when exiting constructor. Consider adding the 'required' modifier or declaring the field as nullable.

Nullability of reference types in type of parameter 'sender' of 'void MainWindow.Pipeline_OnError(object sender, ErrorsEventArgs e)' doesn't match the target delegate 'EventHandler<ErrorsEventArgs>' (possibly because of nullability attributes).

Nullability of reference types in type of parameter 'sender' of 'void MainWindow.Pipeline_OnStop(object sender, StopEventArgs e)' doesn't match the target delegate 'EventHandler<StopEventArgs>' (possibly because of nullability attributes).

Nullability of reference types in type of parameter 'sender' of 'void MainWindow.Pipeline_OnError(object sender, ErrorsEventArgs e)' doesn't match the target delegate 'EventHandler<ErrorsEventArgs>' (possibly because of nullability attributes).

Nullability of reference types in type of parameter 'sender' of 'void MainWindow.MainWindow_Activated(object sender, EventArgs e)' doesn't match the target delegate 'EventHandler' (possibly because of nullability attributes).

Nullability of reference types in type of parameter 'sender' of 'void MainWindow.MainWindow_Closing(object sender, CancelEventArgs e)' doesn't match the target delegate 'EventHandler<WindowClosingEventArgs>' (possibly because of nullability attributes).

Non-nullable field '_tmPosition' must contain a non-null value when exiting constructor. Consider adding the 'required' modifier or declaring the field as nullable.

Non-nullable field '_player' must contain a non-null value when exiting constructor. Consider adding the 'required' modifier or declaring the field as nullable.

Nullability of reference types in type of parameter 'sender' of 'void MainWindow.Player_OnError(object sender, ErrorsEventArgs e)' doesn't match the target delegate 'EventHandler<ErrorsEventArgs>' (possibly because of nullability attributes).

Nullability of reference types in type of parameter 'sender' of 'void MainWindow.Player_OnStop(object sender, StopEventArgs e)' doesn't match the target delegate 'EventHandler<StopEventArgs>' (possibly because of nullability attributes).

Cannot convert null literal to non-nullable reference type.

Nullability of reference types in type of parameter 'sender' of 'void MainWindow.Player_OnStop(object sender, StopEventArgs e)' doesn't match the target delegate 'EventHandler<StopEventArgs>' (possibly because of nullability attributes).

Nullability of reference types in type of parameter 'sender' of 'void MainWindow.Player_OnError(object sender, ErrorsEventArgs e)' doesn't match the target delegate 'EventHandler<ErrorsEventArgs>' (possibly because of nullability attributes).

Dereference of a possibly null reference.

Nullability of reference types in type of parameter 'sender' of 'void MainWindow.MainWindow_Activated(object sender, EventArgs e)' doesn't match the target delegate 'EventHandler' (possibly because of nullability attributes).

Nullability of reference types in type of parameter 'sender' of 'void MainWindow.MainWindow_Closing(object sender, CancelEventArgs e)' doesn't match the target delegate 'EventHandler<WindowClosingEventArgs>' (possibly because of nullability attributes).

Non-nullable field 'VideoEdit1' must contain a non-null value when exiting constructor. Consider adding the 'required' modifier or declaring the field as nullable.

Dereference of a possibly null reference.

Nullability of reference types in type of parameter 'sender' of 'void MainWindow.btSelectFile_Click(object sender, RoutedEventArgs e)' doesn't match the target delegate 'EventHandler<RoutedEventArgs>' (possibly because of nullability attributes).

Dereference of a possibly null reference.

Nullability of reference types in type of parameter 'sender' of 'void MainWindow.btStart_Click(object sender, RoutedEventArgs e)' doesn't match the target delegate 'EventHandler<RoutedEventArgs>' (possibly because of nullability attributes).

Dereference of a possibly null reference.

Nullability of reference types in type of parameter 'sender' of 'void MainWindow.btStop_Click(object sender, RoutedEventArgs e)' doesn't match the target delegate 'EventHandler<RoutedEventArgs>' (possibly because of nullability attributes).