Recherche avancée

Sur d’autres sites (16774)

• avcodec/snowenc : Fix invalid left shift of negative numbers

  21 octobre 2022, par Andreas Rheinhardt

  avcodec/snowenc : Fix invalid left shift of negative numbers
  Affected the vsynth(1|2|_lena)-snow(|-hpel) tests.
  Reviewed-by : Michael Niedermayer <michael@niedermayer.cc>
  
  Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
  

  • [DH] libavcodec/snowenc.c

• 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) ;

  


• 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;
  }