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• How to convert n numbers of images into a video slideshow with putting some transition on each images with flutter_ffmpeg ?

  26 avril 2023, par Shruti Ramnandan Sharma

  I'm trying to convert images into a video slideshow with some transition. I have used flutter_ffmpeg plugin , with this plugin I have created with only 3 images but I want to add n numbers of images but couldn't able to find solutions for it. I tried to add more images but it throws error.

  


  I'm gonna add some piece of code below :

  


  

  1. Instance of FlutterFFmpeg

  


  


    final FlutterFFmpeg _flutterFFmpeg = FlutterFFmpeg(); 


  


  

  2. Picking multiple images from the gallery and applying command to convert images into a video

  


  


  void mergeImageVideo() async {
    final ImagePicker picker = ImagePicker();
    final images = await picker.pickMultiImage();

    var im1 = images[0].path;

    var im2 = images[1].path;

    var im3 = images[2].path;

   //-shortest
    openLoadingDialog(context, "Creating video");
    generateFilePath("ImageVideoMerge").then((outputFile) {
      var backgroundColor = 'FFF44336';

      String ffmpegCommand = VideoUtil.generateImagesToVideoScript(
          im1, im2, im3, outputFile, 'mpeg4', '', backgroundColor);

      print("ffmpegCommand==> $ffmpegCommand");
      _flutterFFmpeg.execute(ffmpegCommand).then((v) {
        if (v == 0) {
          var file = File(outputFile);
          Navigator.pop(context);
          showSnackBar(context, "Images Added Successfully", Colors.black);
          updateVideoPlayer(file);
        } else {
          Navigator.pop(context);
        }
      }).then((executionId) {
      });
    });
  }



  


  method to get ffmpeg command (images into video with scale transition)

  


  static String generateImagesToVideoScript(
      String image1Path,
      String image2Path,
      String image3Path,
      String videoFilePath,
      String videoCodec,
      String customOptions,
      String backgroundColor
      ) {

    // ignore: prefer_interpolation_to_compose_strings
     return "-hide_banner -y -loop 1 -i '" +
        image1Path +
        "' " +
        "-loop   1 -i \"" +
        image2Path +
        "\" " +
        "-loop 1   -i \"" +
        image3Path +
        "\" " +
        "-filter_complex " +
        "\" " +
        "[0:v]setpts=PTS-STARTPTS,scale=w=640:h=424,setsar=sar=1/1,split=2[stream1out1][stream1out2];" +
        "[1:v]setpts=PTS-STARTPTS,scale=w=640:h=424,setsar=sar=1/1,split=2[stream2out1][stream2out2];" +
        "[2:v]setpts=PTS-STARTPTS,scale=w=640:h=424,setsar=sar=1/1,split=2[stream3out1][stream3out2];" +
        "[stream1out1]pad=width=640:height=427:x=(640-iw)/2:y=(427-ih)/2:color=#$backgroundColor,trim=duration=3,select=lte(n\\,90)[stream1overlaid];" +
        "[stream1out2]pad=width=640:height=427:x=(640-iw)/2:y=(427-ih)/2:color=#$backgroundColor,trim=duration=1,select=lte(n\\,30)[stream1ending];" +
        "[stream2out1]pad=width=640:height=427:x=(640-iw)/2:y=(427-ih)/2:color=#$backgroundColor,trim=duration=2,select=lte(n\\,60)[stream2overlaid];" +
        "[stream2out2]pad=width=640:height=427:x=(640-iw)/2:y=(427-ih)/2:color=#$backgroundColor,trim=duration=1,select=lte(n\\,30),split=2[stream2starting][stream2ending];" +
        "[stream3out1]pad=width=640:height=427:x=(640-iw)/2:y=(427-ih)/2:color=#$backgroundColor,trim=duration=2,select=lte(n\\,60)[stream3overlaid];" +
        "[stream3out2]pad=width=640:height=427:x=(640-iw)/2:y=(427-ih)/2:color=#$backgroundColor,trim=duration=1,select=lte(n\\,30)[stream3starting];" +
        "[stream2starting][stream1ending]blend=all_expr='if(gte(X,(W/2)*T/1)*lte(X,W-(W/2)*T/1),B,A)':shortest=1[stream2blended];" +
        "[stream3starting][stream2ending]blend=all_expr='if(gte(X,(W/2)*T/1)*lte(X,W-(W/2)*T/1),B,A)':shortest=1[stream3blended];" +
        "[stream1overlaid][stream2blended][stream2overlaid][stream3blended][stream3overlaid]concat=n=5:v=1:a=0,scale=w=640:h=424,format=yuv420p[video]\"" +
        " -map [video] -vsync 2 -async 1 " +
        customOptions +
        "-c:v " +
        videoCodec +
        " -r 30 " +
        videoFilePath;
  }



  


• Additional : vinUS validation fails on valid vin numbers (#2460)

  1er décembre 2022, par wewhite

  Additional : vinUS validation fails on valid vin numbers (#2460)
  * Removed === compare, changed to ==
  
  Compare by value and type (===) does not work for this algorithm, as both cd and cdv can be either types at the same time.
  
  By comparing by value only (==) cd and cdv can be either integer or string, as a string number will be converted to a number reqardless of type.
  * Rewrote forloop, removed nested forloop
  * Additional : fixed spacing issues
  * Additional : Add vinUS.js validation test cases
  Test cases include default test with 17 one’s, and additional US and Canada VIN
  * Additional : add two more test casses for vinUS
  * Additional : removed text license number, should be VIN
  

• Adding frame numbers to a video, along with total frame duration

  21 novembre 2022, par Abraham Thomas

  I need to add frame numbers to videos along with total frame duration of the video. It should show the first frame and the last frame, along with the current frame.

  


  In this forum someone had posted a command, which gives the current frame number ;
I've used this and this below command works for me :

  


  ffmpeg -i inputvid.mp4 -vf "drawtext=fontfile=Arial.ttf : text='%frame_num' : start_number=1001 : x=(w-tw)/2 : y=h-(2*lh) : fontcolor=white : fontsize=55 : box=1 : boxcolor=black : boxborderw=5" -c:a copy D :\Test\outputvid.mp4

  


  But it doesn't show the total frame duration ;
Is there a way to add to this command ; to show the first frame and last frame of the video as well (I'm on windows) ;