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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;
  }



  


• send browser camera to rtmp server

  22 juin 2022, par anamul

  i am using python and in frotnend javascript.

  


  I am using ffmpeg to push video to rtmp server.

  


  ffmpeg -y -f mp4 -stream_loop -1 -re -i myvideo.mp4
-b:v 3M -vcodec libx264 -r 30.0 -s 1280x720
-c:a copy -b:a 96k
-f flv "rtmps://dfdf222.global-contribute.live-video.net:443/app/"


  


  It is working well but i am not getting how to push to rtmp server of my browser camera ? i mean from javascript ?

  


  i am trying like this :

  


  &#xA;    <video autoplay="autoplay"></video>&#xA;&#xA;    <a href="#">open and stream</a>&#xA;&#xA;    <code class="echappe-js">&lt;script&gt;&amp;#xA;        function streamVideo () {&amp;#xA;            console.log(&amp;#x27;ddd&amp;#x27;)&amp;#xA;            navigator.mediaDevices.getUserMedia({&amp;#xA;            video: {&amp;#xA;&amp;#xA;            },&amp;#xA;            audio: {&amp;#xA;                &amp;#xA;            }&amp;#xA;            }).then(stream=&gt;{&amp;#xA;                console.log(stream)&amp;#xA;                document.getElementById(&amp;#x27;vid&amp;#x27;).srcObject = stream; &amp;#xA;            })&amp;#xA;&amp;#xA;        }&amp;#xA;    &lt;/script&gt;&#xA;&#xA;

  


  It is working but not getting any way to push from browser to rtmp server. I know browser doesnt support rtmp protocol, we need to send it from the backend but can i push to server so that it push to rtmp server ?

  


  Anyone know the way ?

  


• H264 Encoding - Could not play video using VLC Player

  31 mars 2016, par bot1131357

  I am have trouble encoding an H264 video correctly using FFmpeg libav. I could not play the encoded video in VLC media player, and although I could play the video on MPC-HC the time shows 00:00/00:00. Clearly I’m missing something.

  The Media info from MPC-HC shows this :

  General
  Format : AVC
  Format/Info : Advanced Video Codec
  File size : 110 KiB
  Duration : 2s 400ms
  Overall bit rate : 375 Kbps
  Writing library : x264 core 148 r2665 a01e339
  Encoding settings : cabac=0 / ref=3 / deblock=1:0:0 / analyse=0x1:0x111 / me=hex / subme=7 / psy=1 / psy_rd=1.00:0.00 / mixed_ref=1 / me_range=16 / chroma_me=1 / trellis=1 / 8x8dct=0 / cqm=0 / deadzone=21,11 / fast_pskip=1 / chroma_qp_offset=-2 / threads=7 / lookahead_threads=1 / sliced_threads=0 / nr=0 / decimate=1 / interlaced=0 / bluray_compat=0 / constrained_intra=0 / bframes=0 / weightp=0 / keyint=12 / keyint_min=1 / scenecut=40 / intra_refresh=0 / rc_lookahead=12 / rc=abr / mbtree=1 / bitrate=2000 / ratetol=1.0 / qcomp=0.60 / qpmin=0 / qpmax=69 / qpstep=4 / ip_ratio=1.40 / aq=1:1.00

  Video
  Format : AVC
  Format/Info : Advanced Video Codec
  Format profile : Baseline@L2.1
  Format settings, CABAC : No
  Format settings, ReFrames : 3 frames
  Format settings, GOP : M=1, N=12
  Duration : 2s 400ms
  Bit rate : 2 000 Kbps
  Width : 320 pixels
  Height : 240 pixels
  Display aspect ratio : 4:3
  Frame rate mode : Variable
  Frame rate : 20.833 fps
  Color space : YUV
  Chroma subsampling : 4:2:0
  Bit depth : 8 bits
  Scan type : Progressive
  Bits/(Pixel*Frame) : 1.250
  Stream size : 586 KiB
  Writing library : x264 core 148 r2665 a01e339
  Encoding settings : cabac=0 / ref=3 / deblock=1:0:0 / analyse=0x1:0x111 / me=hex / subme=7 / psy=1 / psy_rd=1.00:0.00 / mixed_ref=1 / me_range=16 / chroma_me=1 / trellis=1 / 8x8dct=0 / cqm=0 / deadzone=21,11 / fast_pskip=1 / chroma_qp_offset=-2 / threads=7 / lookahead_threads=1 / sliced_threads=0 / nr=0 / decimate=1 / interlaced=0 / bluray_compat=0 / constrained_intra=0 / bframes=0 / weightp=0 / keyint=12 / keyint_min=1 / scenecut=40 / intra_refresh=0 / rc_lookahead=12 / rc=abr / mbtree=1 / bitrate=2000 / ratetol=1.0 / qcomp=0.60 / qpmin=0 / qpmax=69 / qpstep=4 / ip_ratio=1.40 / aq=1:1.00

  I noticed something odd in the above info :
   The frame rate is 20.833 fps, instead of the specified 10 fps.
   Duration of 2s 400ms did not seem right either, since the video played for more than 4s.

  Also, (AVFrame* picture)->pict_type is always set to AV_PICTURE_TYPE_NONE. I don’t think this is normal.

  The library that I’m using is ffmpeg-20160219-git-98a0053-win32-dev. I would really really appreciate if you could help me out of this confusion.

  /*
  
   * Video encoding example
  
   */
  
  char filename[] = "test.mp4";
  
  int main(int argc, char** argv)
  
  {
  
      AVCodec *codec = NULL;
  
      AVCodecContext *codecCtx= NULL;
  
      AVFormatContext *pFormatCtx = NULL;
  
      AVStream * pVideoStream = NULL;
  
      AVFrame *picture = NULL;
  
  
  
      int i, x, y,            //
  
          ret,                // Return value
  
          got_packet_ptr;     // Data encoded into packet
  
  
  
      printf("Video encoding\n");
  
  
  
      // Register all formats and codecs
  
      av_register_all();
  
  
  
      // allocate context
  
      pFormatCtx = avformat_alloc_context();
  
      memcpy(pFormatCtx->filename,filename,
  
          min(strlen(filename), sizeof(pFormatCtx->filename)));
  
  
  
      // guess format
  
      pFormatCtx->oformat = av_guess_format("h264", NULL, NULL);
  
      if (NULL==pFormatCtx->oformat)
  
      {
  
          cerr << "Could not guess output format" << endl;
  
          return -1;
  
      }   
  
  
  
      // Find the codec.
  
      codec = avcodec_find_encoder(pFormatCtx->oformat->video_codec);
  
      if (codec == NULL) {
  
          fprintf(stderr, "Codec not found\n");
  
          return -1;
  
      }
  
  
  
      // Set context
  
      int framerate = 10;
  
      codecCtx = avcodec_alloc_context3(codec);
  
      avcodec_get_context_defaults3(codecCtx, codec); 
  
      codecCtx->pix_fmt = AV_PIX_FMT_YUV420P;
  
      codecCtx->profile = FF_PROFILE_H264_BASELINE; 
  
      // Resolution must be a multiple of two.
  
      codecCtx->width  = 320;
  
      codecCtx->height = 240;
  
  
  
      codecCtx->bit_rate = 2000000;
  
      codecCtx->time_base.den = framerate;
  
      codecCtx->time_base.num = 1;
  
      codecCtx->gop_size = 12; // emit one intra frame every twelve frames at most
  
  
  
      // Open the codec.  
  
      if (avcodec_open2(codecCtx, codec, NULL) < 0) 
  
      {
  
          printf("Cannot open video codec\n");
  
          return -1;
  
      }
  
  
  
      // Add stream to pFormatCtx
  
      pVideoStream = avformat_new_stream(pFormatCtx, codec);
  
      if (!pVideoStream) 
  
      {
  
          printf("Cannot add new video stream\n");
  
          return -1;
  
      }
  
      pVideoStream->codec = codecCtx;
  
      pVideoStream->time_base.den = framerate;
  
      pVideoStream->time_base.num = 1;
  
  
  
      if (avio_open2(&pFormatCtx->pb, filename, AVIO_FLAG_WRITE, NULL, NULL) < 0) 
  
      {
  
          printf("Cannot open file\n");
  
          return -1;
  
      }
  
  
  
      // Write file header.
  
      avformat_write_header(pFormatCtx, NULL);
  
  
  
      // Create frame
  
      picture= av_frame_alloc();
  
      picture->format = codecCtx->pix_fmt;
  
      picture->width  = codecCtx->width;
  
      picture->height = codecCtx->height;
  
  
  
      int bufferImgSize = av_image_get_buffer_size(codecCtx->pix_fmt, codecCtx->width,
  
                      codecCtx->height,1);    
  
      av_image_alloc(picture->data, picture->linesize, codecCtx->width, codecCtx->height,                 codecCtx->pix_fmt, 32);
  
  
  
      AVPacket avpkt;
  
  
  
      /* encode 1 second of video */
  
      for(i=0;i<50;i++) 
  
      {
  
          /* prepare a dummy image */
  
          /* Y */
  
          for(y=0;yheight;y++)
  
          {
  
              for(x=0;xwidth;x++) 
  
              {
  
                  picture->data[0][y * picture->linesize[0] + x] = x + y + i * 3;
  
              }
  
          }
  
          /* Cb and Cr */
  
          for(y=0;yheight/2;y++) 
  
          {
  
              for(x=0;xwidth/2;x++) 
  
              {
  
                  picture->data[1][y * picture->linesize[1] + x] = 128 + y + i * 2;
  
                  picture->data[2][y * picture->linesize[2] + x] = 64 + x + i * 5;
  
              }
  
          }
  
  
  
          // Get timestamp
  
          picture->pts = (float) i * (1000.0/(float)(codecCtx->time_base.den)) * 90; 
  
  
  
          // Encode frame to packet
  
          av_init_packet(&avpkt);
  
          got_packet_ptr = 0;
  
          int error = avcodec_encode_video2(codecCtx, &avpkt, picture, &got_packet_ptr);
  
          if (!error && got_packet_ptr > 0) 
  
          {
  
              // Write packet with frame.
  
              ret = (av_interleaved_write_frame(pFormatCtx, &avpkt) == 0);        
  
          }   
  
          av_packet_unref(&avpkt); 
  
      }
  
  
  
      // Flush remaining encoded data
  
      while(1)
  
      {
  
          av_init_packet(&avpkt);
  
          got_packet_ptr = 0;
  
          // Encode frame to packet.
  
          int error = avcodec_encode_video2(codecCtx, &avpkt, NULL, &got_packet_ptr);
  
          if (!error && got_packet_ptr > 0) 
  
          {
  
              // Write packet with frame.
  
              ret = (av_interleaved_write_frame(pFormatCtx, &avpkt) == 0);        
  
          } 
  
          else 
  
          {
  
              break;
  
          }
  
          av_packet_unref(&avpkt); 
  
      }
  
      av_write_trailer(pFormatCtx);
  
  
  
      av_packet_unref(&avpkt);
  
      av_frame_free(&picture);
  
  
  
      avcodec_close(codecCtx);
  
      av_free(codecCtx);
  
  
  
      cin.get();
  
  }