Capture video to canvas flutter

Question

I would like to implement a video to canvas app like my example in js : http://jsfiddle.net/Ls9kfwot/2/

But my problem is how i can take a screenshot of video player in a specific area? like js in drawImage:

ctx.drawImage(sx,sy,swidth,sheight,x,y,width,height); // js drawimage

but in Flutter what can i use for reproduce video to canvas?

i created a simple flutter project with a video player:

  @override
  Widget build(BuildContext context) {

    return Scaffold(
      appBar: AppBar(
        title: Text(widget.title),
      ),
      body: YoYoPlayer(
        aspectRatio: 16 / 9,
        url:
            "http://upload.wikimedia.org/wikipedia/commons/7/79/Big_Buck_Bunny_small.ogv",
        videoStyle: VideoStyle(),
        videoLoadingStyle: VideoLoadingStyle(
          loading: Center(
            child: Text("Loading video"),
            //capture image of video and display it
          ),
        ),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: _incrementCounter,
        tooltip: 'Increment',
        child: Icon(Icons.add),
      ), // This trailing comma makes auto-formatting nicer for build methods.
    );
  }

RenderRepaintBoundary and drawImage is the solution?

Answer 1

Yep, RenderRepaintBoundary and drawImage is what you want.

  GlobalKey _repaintKey = GlobalKey();

  @override
  Widget build(BuildContext context) {

    return Scaffold(
      appBar: AppBar(
        title: Text(widget.title),
      ),
      body: RenderRepaintBoundary(
        key: _repaintKey,
        child: YoYoPlayer(
          aspectRatio: 16 / 9,
          url:
              "http://upload.wikimedia.org/wikipedia/commons/7/79/Big_Buck_Bunny_small.ogv",
          videoStyle: VideoStyle(),
          videoLoadingStyle: VideoLoadingStyle(
            loading: Center(
              child: Text("Loading video"),
              //capture image of video and display it
            ),
          ),
        ),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: _incrementCounter,
        tooltip: 'Increment',
        child: Icon(Icons.add),
      ), // This trailing comma makes auto-formatting nicer for build methods.
    );
  }

final boundary = _repaintKey.context.findRenderObject() as RenderRepaintBoundary;
final image = await boundary.toImage();
canvas.drawImage(image, Offset(10, 20), paint);