preview_page.dart

class PreviewPage extends StatefulWidget {
  final Data assetData;

  const PreviewPage({@required this.assetData});

  @override
  _PreviewPageState createState() => _PreviewPageState();
}

class _PreviewPageState extends State<PreviewPage> {
  VideoPlayerController _controller;
  Data assetData;
  String dateTimeString;

  @override
  void initState() {
    super.initState();

    assetData = widget.assetData;
    String playbackId = assetData.playbackIds[0].id;

    DateTime dateTime = DateTime.fromMillisecondsSinceEpoch(
        int.parse(assetData.createdAt) * 1000);
    DateFormat formatter = DateFormat.yMd().add_jm();
    dateTimeString = formatter.format(dateTime);

    _controller = VideoPlayerController.network(
        '$muxStreamBaseUrl/$playbackId.$videoExtension')
      ..initialize().then((_) {
        setState(() {});
      });

    _controller.play();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        elevation: 0,
        brightness: Brightness.dark,
        title: Text('Video preview'),
        backgroundColor: CustomColors.muxPink,
      ),
      body: SingleChildScrollView(
        physics: BouncingScrollPhysics(),
        child: Column(
          mainAxisAlignment: MainAxisAlignment.start,
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            // Add the widgets here
          ],
        ),
      ),
    );
  }
}