Hey Johannes, I came here through your youtube tutorial of how to convert widget to image and I assume you can solve my problem.

Actually I want to render the flutter animation/transition to video in mp4 format and want to save in local device gallery as a video, is it possible if yes, I request you to help me how to do that.

I will be very grateful for you.

Thankyou.

Unhandled Exception: NoSuchMethodError: The getter 'currentContext' was called on null

I'm getting this error when I called key.currentContext

Need change code for lasted version flutter.

class Utils {
  static Future capture(GlobalKey key) async {
    if (key == null) return null;

    RenderRepaintBoundary boundary =
        key.currentContext!.findRenderObject() as RenderRepaintBoundary;
    final image = boundary.toImage(pixelRatio: 3);

    ByteData byteData = await image.toByteData(format: ui.ImageByteFormat.png);
    final pngBytes = byteData.buffer.asUint8List();

    return pngBytes;
  }
}

error in toByteData.