A flutter package for Android for applying OpenGL filters to video.

Usage

How to generate and use a bunch of filters

How to add custom filters

Export & save video

import 'package:flutter_gpu_video_filters/flutter_gpu_video_filters.dart';

final inputSource = AssetInputSource('demo.mp4');
final output = File('result.mp4');
final configuration = GPUGrayScaleConfiguration();
final processStream =  configuration.exportVideoFile(VideoExportConfig(AssetInputSource(asset), output));
await for (final progress in processStream) {
  debugPrint('Exporting file ${(progress * 100).toInt()}%');
}

GPUVideoNativePreview example

import 'package:flutter_gpu_video_filters/flutter_gpu_video_filters.dart';

class PreviewPage extends StatefulWidget {
  const PreviewPage({Key? key}) : super(key: key);

  @override
  State<PreviewPage> createState() => _PreviewPageState();
}

class _PreviewPageState extends State<PreviewPage> {
  late GPUVideoPreviewController configuration;
  late final GPUGrayScaleConfiguration controller;
  late final GPUVideoPreviewParams previewParams;
  bool paramsReady = false;

  @override
  void initState() {
    super.initState();
    _prepare().whenComplete(() {
      setState(() {});
    });
  }

  Future<void> _prepare() async {
    configuration = GPUGrayScaleConfiguration();
    previewParams = await GPUVideoPreviewParams.create(configuration);
    paramsReady = true;
  }

  @override
  void dispose() {
    controller.dispose();
    configuration.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return paramsReady
        ? GPUVideoNativePreview(
      params: previewParams,
      configuration: configuration,
      onViewCreated: (controller, outputSizeStream) async {
        this.controller = controller;
        await this.controller.setVideoAsset(_assetPath);
        await for (final size in outputSizeStream) {
          setState(() {});
        }
      },
    )
        : const Offstage();
  }
}

Additional information

Support status of GPUImage for Android shaders

Examples

• Big Flutter Filters Demo - big example of how to use filters and.

Maintainers

• Nikolay Dymura
• Egor Terekhov
• Nataliia Zabiiaka