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• Artisan Fatal error when trying to install Laravel FFMpeg

  26 janvier 2017, par Chris Palmer Breuer

  I am trying to include pbmedia/laravel-ffmpeg package in my Laravel app but for some reason when I run composer require pbmedia/laravel-ffmpeg I receive this error :

  composer require pbmedia/laravel-ffmpeg
  
  Using version ^1.1 for pbmedia/laravel-ffmpeg
  
  ./composer.json has been updated
  
  Loading composer repositories with package information
  
  Updating dependencies (including require-dev)
  
  Nothing to install or update
  
  Generating autoload files
  
  > Illuminate\Foundation\ComposerScripts::postUpdate
  
  > php artisan optimize
  
  PHP Fatal error:  Uncaught Symfony\Component\Debug\Exception\FatalThrowableError: Class 'PHPExcel_Shared_Font' not found in /Users/chrisbreuer/code/clooud/config/excel.php:182
  
  Stack trace:
  
  #0 /Users/chrisbreuer/code/clooud/vendor/laravel/framework/src/Illuminate/Foundation/Bootstrap/LoadConfiguration.php(60): require()
  
  #1 /Users/chrisbreuer/code/clooud/vendor/laravel/framework/src/Illuminate/Foundation/Bootstrap/LoadConfiguration.php(38): Illuminate\Foundation\Bootstrap\LoadConfiguration->loadConfigurationFiles(Object(Illuminate\Foundation\Application), Object(Illuminate\Config\Repository))
  
  #2 /Users/chrisbreuer/code/clooud/vendor/laravel/framework/src/Illuminate/Foundation/Application.php(203): Illuminate\Foundation\Bootstrap\LoadConfiguration->bootstrap(Object(Illuminate\Foundation\Application))
  
  #3 /Users/chrisbreuer/code/clooud/vendor/laravel/framework/src/Illuminate/Foundation/Console/Kernel.php(267): Illuminate\Foundation\Application->bootstrapWith(Array)
  
  #4 /Users/chrisbreuer/code/clooud/vendor/laravel/framework/src/Illu in /Users/chrisbreuer/code/clooud/config/excel.php on line 182
  
  
  
  Fatal error: Uncaught Symfony\Component\Debug\Exception\FatalThrowableError: Class 'PHPExcel_Shared_Font' not found in /Users/chrisbreuer/code/clooud/config/excel.php:182
  
  Stack trace:
  
  #0 /Users/chrisbreuer/code/clooud/vendor/laravel/framework/src/Illuminate/Foundation/Bootstrap/LoadConfiguration.php(60): require()
  
  #1 /Users/chrisbreuer/code/clooud/vendor/laravel/framework/src/Illuminate/Foundation/Bootstrap/LoadConfiguration.php(38): Illuminate\Foundation\Bootstrap\LoadConfiguration->loadConfigurationFiles(Object(Illuminate\Foundation\Application), Object(Illuminate\Config\Repository))
  
  #2 /Users/chrisbreuer/code/clooud/vendor/laravel/framework/src/Illuminate/Foundation/Application.php(203): Illuminate\Foundation\Bootstrap\LoadConfiguration->bootstrap(Object(Illuminate\Foundation\Application))
  
  #3 /Users/chrisbreuer/code/clooud/vendor/laravel/framework/src/Illuminate/Foundation/Console/Kernel.php(267): Illuminate\Foundation\Application->bootstrapWith(Array)
  
  #4 /Users/chrisbreuer/code/clooud/vendor/laravel/framework/src/Illu in /Users/chrisbreuer/code/clooud/config/excel.php on line 182
  
  Script php artisan optimize handling the post-update-cmd event returned with error code 255
  
  
  
  Installation failed, reverting ./composer.json to its original content.

  my composer.json file looks like this :

  {
  
      "name": "laravel/laravel",
  
      "description": "The Laravel Framework.",
  
      "keywords": ["framework", "laravel"],
  
      "license": "MIT",
  
      "type": "project",
  
      "require": {
  
          "php": ">=5.6.4",
  
          "laravel/framework": "5.3.*"
  
      },
  
      "require-dev": {
  
          "fzaninotto/faker": "~1.4",
  
          "mockery/mockery": "0.9.*",
  
          "phpunit/phpunit": "~5.0",
  
          "symfony/css-selector": "3.1.*",
  
          "symfony/dom-crawler": "3.1.*"
  
      },
  
      "autoload": {
  
          "classmap": [
  
              "database"
  
          ],
  
          "psr-4": {
  
              "App\\": "app/"
  
          }
  
      },
  
      "autoload-dev": {
  
          "classmap": [
  
              "tests/TestCase.php"
  
          ]
  
      },
  
      "scripts": {
  
          "post-root-package-install": [
  
              "php -r \"file_exists('.env') || copy('.env.example', '.env');\""
  
          ],
  
          "post-create-project-cmd": [
  
              "php artisan key:generate"
  
          ],
  
          "post-install-cmd": [
  
              "Illuminate\\Foundation\\ComposerScripts::postInstall",
  
              "php artisan optimize"
  
          ],
  
          "post-update-cmd": [
  
              "Illuminate\\Foundation\\ComposerScripts::postUpdate",
  
              "php artisan optimize"
  
          ]
  
      },
  
      "config": {
  
          "preferred-install": "dist",
  
          "sort-packages": true
  
      }
  
  }

  Any help would be greatly appreciated !

  Thanks so much,
  Chris

• Powerpoint can't show a video with headers. I see green screen

  28 novembre 2017, par zinon

  I’ve created a video using ffmpeg that contains headers.

  My script for creating it is :

  ffmpeg.exe -f rawvideo -vcodec rawvideo -s 560x448 -r 40 -pix_fmt yuv420p -i C_L_560x448_40_static_maxSSIM_QP23_B2.yuv -vcodec rawvideo -qscale 0 -filter_complex "drawtext=fontsize=32: fontfile=FreeSerif.ttf: text='SSIM=0.961': x=(w-tw)/2: y=(lh/2): fontcolor=orange, drawtext=fontsize=22: fontfile=FreeSerif.ttf: text='Bitrate≤1800 [1873 kbps], Frame rate≥40 [43.98 fps]': x=(w-tw)/2: y=(lh/2+30): fontcolor=orange : box=1: boxcolor=0x00000099, drawbox=x=80:y=160:w=220:h=135:color=red@0.5" C_L_560x448_40_static_maxSSIM_QP23_B2_new.avi

  Firstly, media player showed it as green screen. I downloaded

  Media Player Codec Pack

  and now show its correclty.

  However, when I insert it in powerpoint 2016 I have the same problem of green screen. Do you know how to fix this ?

  vlc player can play it correctly. Is there any way to change the player of excel and use vlc player instead ?

• 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,...