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• Android how to record my mobile screen in android with out using USB cable ?

  21 juin 2012, par Rajesh

  I am wondering to do the android application which should record my screen activities and should store as the video file .

  1) i need to take the screen shots of my screen movements with the periodic interval and should store in sdcard.

  2) how to create the video from the images which is already available in my sdcard. I have tried with the FFMPEG. but i have few problems dont know how to solve it .. the truth is dont know the program to convert it .

  3 ) is it possible to show the picture in my camera ?? That means if user opens the camera from my app some times i should show the pictures which available in my sdcard .. if its so please advice me .

  Thanks ,
  Rajesh .

• Flutter (Dart) : Record two videos, merge them and then view new video in gallery

  14 juin 2020, par Ittai Barkai

  I am aware that there already exists a solution to a very similar question, which can be found on the following link : Flutter/Dart : Find two video segments and merge them into a single valid video file ? However, being relatively new to Flutter (and programming in general) I cannot seem to replicate the desired result.

  



  My app is very simple and currently looks like this :

  



  

  



  I click on the button "Record Video" to record two videos, which are both successfully stored into the device's gallery. Using the Flutter image_picker and gallery_saver packages and the following piece of code :

  



      void _recordVideo() async {
    ImagePicker.pickVideo(source: ImageSource.camera)
        .then((File recordedVideo) {
      if (recordedVideo != null && recordedVideo.path != null) {
        setState(() {
          _buttonText = 'Saving in Progress...';
        });
        GallerySaver.saveVideo(recordedVideo.path).then((_) {
          setState(() {
            _buttonText = 'Video Saved!\n\nClick to Record New Video';
            if (_storedVideoOne == null) {
              _storedVideoOne = recordedVideo;
              print('video 1 stored');
            } else {
              _storedVideoTwo = recordedVideo;
              print('video 2 stored');
              _videoMerger();
            }
          });
        });
      }
    });
  }


  



  I can view these videos when I click on the button at the bottom "View Video From Gallery".

  



  Next I try to merge these two stored video files, using the flutter_ffmpeg package, as well as following the solution provided in the stack overflow question mentioned above. I try and do this using the following function I wrote :

  



  void _videoMerger() async {


    final appDir = await syspaths.getApplicationDocumentsDirectory();
    String rawDocumentPath = appDir.path;
    final outputPath = '$rawDocumentPath/output.mp4';

    final FlutterFFmpeg _flutterFFmpeg = new FlutterFFmpeg();

        String commandToExecute = '-i ${_storedVideoOne.path} -i ${_storedVideoTwo.path} -filter_complex \'[0:0][1:0]concat=n=2:v=0:a=1[out]\' -map \'[out]\' outputPath';
        _flutterFFmpeg.execute(commandToExecute).then((rc) => print("FFmpeg process exited with rc $rc"));

  }


  



  But after running the function I do not seem to get a new combined video, which should be stored in outputPath and ideally also viewable in the gallery. Uploaded the Flutter project onto GitHub here :

  



  https://github.com/IttaiBarkai/Flutter-Video-Merger

  



  Any help would be greatly appreciated :)

  


• How do I use ffmpeg to record a video clip with 20 seconds before and 20 seconds after motion happened ?

  19 avril 2020, par user2661357

  I am using an IP camera with rtsp stream to do motion detection. When a motion happens, I want to use ffmpeg to record a video clip with 20 seconds before and 20 seconds after motion happened. Please show me how I should do that use ffmpeg. Thanks.