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• How to fix ffmpeg,js length error in react-js project | fix error in react project

  19 février 2024, par X3R0

  I've tried to import the ffmpeg js library into my react-typescript project, I can't really update my project's react version or react-scripts due to the current code base.

  


  Error

  


  ./node_modules/@ffmpeg/ffmpeg/dist/umd/ffmpeg.js
TypeError: REDACTED_PROJECT_ROOT\node_modules\@ffmpeg\ffmpeg\dist\umd\ffmpeg.js: Cannot read properties of undefined (reading 'length')


  


  Code

  


  import React, { useEffect, useRef, useState } from 'react';
import { FFmpeg } from '@ffmpeg/ffmpeg';

/* MORE CODE HERE */

const ffmpeg = new FFmpeg();
const baseURL = 'https://unpkg.com/@ffmpeg/core@0.12.6/dist/umd';
const coreURL = `${baseURL}/ffmpeg-core.js`;
const wasmURL = `${baseURL}/ffmpeg-core.wasm`;
const coreData = await fromURLToBlob(coreURL);
const wasmData = await fromURLToBlob(wasmURL);
const coreBlob = new Blob([coreData], { type: "text/javascript"});
const wasmBlob = new Blob([wasmData], { type: "application/wasm"});
await ffmpeg.load({
    coreURL: fromBlobToURL(coreBlob),
    wasmURL: fromBlobToURL(wasmBlob),
});       

/* MORE CODE HERE */


  


  Versions

  


  npm v8.19.4
node v16.20.2


  


  tsconfig.json

  


  {
  "compilerOptions": {
    "target": "es5",
    "lib": [
      "dom",
      "dom.iterable",
      "esnext"
    ],
    "allowJs": true,
    "skipLibCheck": true,
    "esModuleInterop": true,
    "allowSyntheticDefaultImports": true,
    "strict": false,
    "forceConsistentCasingInFileNames": true,
    "noFallthroughCasesInSwitch": true,
    "module": "esnext",
    "moduleResolution": "node",
    "resolveJsonModule": true,
    "isolatedModules": true,
    "noEmit": true,
    "jsx": "react-jsx"
  },
  "include": [
    "src"
  ]
}



  


  package.json

  


  {
  "name": "frontend",
  "version": "0.1.0",
  "private": true,
  "dependencies": {
    "@emotion/react": "^11.10.4",
    "@emotion/styled": "^11.10.4",
    "@ffmpeg/ffmpeg": "^0.12.10",
    "@material-ui/core": "^4.12.3",
    "@mui/base": "^5.0.0-beta.36",
    "@mui/icons-material": "^5.10.3",
    "@mui/material": "^5.15.10",
    "@mui/x-data-grid": "^6.19.2",
    "@mui/x-data-grid-pro": "^6.19.2",
    "@reduxjs/toolkit": "^1.8.5",
    "@testing-library/jest-dom": "^5.14.1",
    "@testing-library/react": "^11.2.7",
    "@testing-library/user-event": "^12.8.3",
    "@toast-ui/editor": "^3.1.3",
    "@toast-ui/react-editor": "^3.1.3",
    "@types/jest": "^29.0.1",
    "@types/node": "^18.7.17",
    "@types/react": "^17.0.49",
    "@types/react-dom": "^18.0.6",
    "@zalando/oauth2-client-js": "^0.0.18",
    "ajv": "^8.12.0",
    "ajv-errors": "^3.0.0",
    "apexcharts": "^3.28.1",
    "arraybuffer-concat": "^0.0.1",
    "axios": "^1.4.0",
    "base64-blob": "^1.4.1",
    "bootstrap": "^5.1.1",
    "datetime-diff": "^0.2.1",
    "fuzzy-time": "^1.0.7",
    "jquery": "^3.6.0",
    "jso": "^4.1.1",
    "luxon": "^2.3.0",
    "pretty-bytes": "^5.6.0",
    "react": "^17.0.2",
    "react-apexcharts": "^1.3.9",
    "react-beautiful-dnd": "^13.1.0",
    "react-bootstrap": "^2.0.0-rc.0",
    "react-dom": "^17.0.2",
    "react-export-excel": "^0.5.3",
    "react-facebook": "^9.0.12",
    "react-helmet": "^6.1.0",
    "react-icons": "^4.3.1",
    "react-media-recorder": "^1.6.6",
    "react-notifications": "^1.7.2",
    "react-pages": "^0.4.4",
    "react-redux": "^7.2.8",
    "react-router": "^5.2.1",
    "react-router-dom": "^5.2.1",
    "react-scripts": "4.0.3",
    "react-toastify": "^8.0.2",
    "react-tooltip": "^4.2.21",
    "react-webcam": "^6.0.0",
    "recharts": "^2.1.8",
    "redux": "^4.2.0",
    "redux-thunk": "^2.4.1",
    "typescript": "^4.8.3",
    "web-vitals": "^1.1.2",
    "website-popup": "^3.0.0"
  },
  "scripts": {
    "start": "react-scripts start",
    "build": "set NODE_OPTIONS=--max-old-space-size=4096 && react-scripts build --GENERATE_SOURCEMAP=false",
    "test": "react-scripts test",
    "eject": "react-scripts eject"
  },
  "eslintConfig": {
    "extends": [
      "react-app"
    ]
  },
  "browserslist": {
    "production": [
      ">0.2%",
      "not dead",
      "not op_mini all"
    ],
    "development": [
      "last 1 chrome version",
      "last 1 firefox version",
      "last 1 safari version"
    ]
  },
  "devDependencies": {
    "@babel/plugin-proposal-nullish-coalescing-operator": "^7.18.6"
  }
}



  


• FFMPEG Audio decode and draw waveform

  7 avril 2016, par Haris

  I am trying to decode the audio and draw the waveform using ffmpeg, and the input audio data is AV_SAMPLE_FMT_S16P, basically I am following the tutorial here, and the audio is playing fine with libao. Now I need to plot the waveform using decoded data, currently I am writing left and right channel to separate csv file and plotting on excel. But the waveform is something different from the waveform shown in Audacity using the same audio clip. When I analyzed the value written on csv most of the values are close to maximum of uint16_t(65535), but there are some other lower values, but majority is high peak.

  Here is the source code,

      const char* input_filename="/home/user/Music/Clip.mp3";
  
      av_register_all();
  
      AVFormatContext* container=avformat_alloc_context();
  
      if(avformat_open_input(&container,input_filename,NULL,NULL)<0){
  
          endApp("Could not open file");
  
      }
  
  
  
      if(avformat_find_stream_info(container, NULL)<0){
  
          endApp("Could not find file info");
  
      }
  
  
  
      av_dump_format(container,0,input_filename,false);
  
  
  
      int stream_id=-1;
  
      int i;
  
      for(i=0;inb_streams;i++){
  
          if(container->streams[i]->codec->codec_type==AVMEDIA_TYPE_AUDIO){
  
              stream_id=i;
  
              break;
  
          }
  
      }
  
      if(stream_id==-1){
  
          endApp("Could not find Audio Stream");
  
      }
  
  
  
      AVDictionary *metadata=container->metadata;
  
  
  
      AVCodecContext *ctx=container->streams[stream_id]->codec;
  
      AVCodec *codec=avcodec_find_decoder(ctx->codec_id);
  
  
  
      if(codec==NULL){
  
          endApp("cannot find codec!");
  
      }
  
  
  
      if(avcodec_open2(ctx,codec,NULL)<0){
  
          endApp("Codec cannot be found");
  
      }
  
  
  
  
  
  
  
      AVPacket packet;
  
      av_init_packet(&packet);
  
  
  
      //AVFrame *frame=avcodec_alloc_frame();
  
      AVFrame *frame=av_frame_alloc();
  
  
  
      int buffer_size=AVCODEC_MAX_AUDIO_FRAME_SIZE+ FF_INPUT_BUFFER_PADDING_SIZE;
  
  
  
      // MSVC can't do variable size allocations on stack, ohgodwhy
  
      uint8_t *buffer = new uint8_t[buffer_size];
  
      packet.data=buffer;
  
      packet.size =buffer_size;
  
  
  
      int frameFinished=0;
  
  
  
      int plane_size;
  
  
  
      ofstream fileCh1,fileCh2;
  
      fileCh1.open ("ch1.csv");
  
      fileCh2.open ("ch2.csv");
  
  
  
      AVSampleFormat sfmt=ctx->sample_fmt;
  
  
  
      while(av_read_frame(container,&packet)>=0)
  
      {
  
  
  
          if(packet.stream_index==stream_id){
  
              int len=avcodec_decode_audio4(ctx,frame,&frameFinished,&packet);
  
              int data_size = av_samples_get_buffer_size(&plane_size, ctx->channels,
  
                                                  frame->nb_samples,
  
                                                  ctx->sample_fmt, 1);
  
  
  
  
  
              if(frameFinished){
  
                  int write_p=0;
  
                  // QTime t;
  
                  switch (sfmt){
  
  
  
                      case AV_SAMPLE_FMT_S16P:
  
  
  
                          for (int nb=0;nbsizeof(uint16_t);nb++){
  
                              for (int ch = 0; ch < ctx->channels; ch++) {
  
                                  if(ch==0)
  
                                      fileCh1 <<((uint16_t *) frame->extended_data[ch])[nb]<<"\n";
  
                                  else if(ch==1)
  
                                      fileCh2 <<((uint16_t *) frame->extended_data[ch])[nb]<<"\n";
  
                              }
  
                          }
  
  
  
                          break;
  
  
  
                  }
  
              } else {
  
                  DBG("frame failed");
  
              }
  
          }
  
  
  
  
  
          av_free_packet(&packet);
  
      }
  
      fileCh1.close();
  
      fileCh2.close();
  
      avcodec_close(ctx);
  
      avformat_close_input(&container);
  
      delete buffer;
  
      return 0;

  Edit :

  I have attached the waveform image draw using opencv, here I scaled the sample value to 0-255 range, and took value 127 as 0(Y-axis). Now for each sample draw line from (x,127) to (x,sample value) where x=1,2,3,...

  

• Resize videos and keep codecs using PHP-FFMpeg

  30 décembre 2019, par tmp_hallenser

  I’m trying to resize a couple of videos (with different codecs) using PHP-FFMpeg. The official documentation gives the following example (see https://github.com/PHP-FFMpeg/PHP-FFMpeg)

  $ffmpeg = FFMpeg\FFMpeg::create();
  
  $video = $ffmpeg->open('video.mpg');
  
  $video
  
      ->filters()
  
      ->resize(new FFMpeg\Coordinate\Dimension(320, 240))
  
      ->synchronize();
  
  $video
  
      ->frame(FFMpeg\Coordinate\TimeCode::fromSeconds(10))
  
      ->save('frame.jpg');
  
  $video
  
      ->save(new FFMpeg\Format\Video\X264(), 'export-x264.mp4')
  
      ->save(new FFMpeg\Format\Video\WMV(), 'export-wmv.wmv')
  
      ->save(new FFMpeg\Format\Video\WebM(), 'export-webm.webm');

  Since I don’t want to specify the codec (take the same as the source file), I was trying to create a copy-format and use this format instead for the save command.

  class MOVFormat extends FFMpeg\Format\Video\DefaultVideo
  
  {
  
      public function __construct($audioCodec = 'copy', $videoCodec = 'copy')
  
      {
  
          $this
  
              ->setAudioCodec($audioCodec)
  
              ->setVideoCodec($videoCodec);
  
      }
  
  
  
      public function supportBFrames()
  
      {
  
          return false;
  
      }
  
  
  
      public function getAvailableAudioCodecs()
  
      {
  
          return ['copy'];
  
      }
  
  
  
      public function getAvailableVideoCodecs()
  
      {
  
          return ['copy'];
  
      }
  
  }

  This results in Filtergraph '[in]scale=320:240 [out]' was defined for video output stream 0:0 but codec copy was selected. and Filtering and streamcopy cannot be used together.

  Technically, it should be possible to resize without specifying the codec if I look at this reply : https://superuser.com/a/624564

  Any help is appreciated !