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• FFMPEG GOP Extraction

  29 mars 2015, par user3601375

  I have an MPEG -4 video and I would like to extract a one GOP (Group of pictures ) at a time to BMPs (using FFMPEG and c++ (code block) ) rather than the whole video in one go, since now all my code writing is stuck there I use to sketch everything in my mind then program and I can’t imagine how to do this, I searched the net for something like that but of no use.. any command line or any library used to do that (I have no full experience on FFMPEG I have read the documentation but that thing was not there). I will appreciate any kind help and thanks for reading y post.

  Regards,

• 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

• Convert audio blob to mp3 on expressjs server

  27 septembre 2020, par islalobo

  I have a little app that captures sound and stores the audio as an audio blob encoded as base64 on an expressjs server. I would like to convert these audio files into .mp3 or .wav - any binary usable format. My understanding of audio files is very basic and I'm looking to gain a better understanding. Any guidance is appreciated. I've read through several posts and issues, but I'm just a bit lost right now.

  


  Here is my client-side capture of the audio, encoding and then posting to expressjs server.

  


  const saveMessage = async function(base64AudioMessage) {
    await fetch('/messages', {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify({ message: base64AudioMessage })
      }).then(res => {
        if (res.status === 201) {
          const response = res.json()
          .then(response => {
            console.log(response);
            populateAudioMessages(response.id); // shows the recording that was just saved
          });
        }
        console.log('Invalid status saving audio message: ' + res.status);
      });
      return true;
  }

  sendButton.addEventListener('click', () => {
    const reader = new FileReader();
    reader.readAsDataURL(audio.audioBlob);
    reader.onload = async () => {
      const base64AudioMessage = reader.result.split(',')[1];
      
      await saveMessage(base64AudioMessage);
    };
  });


  


  Here is the post method on my expressjs server. It's very messy as I have been trying to use ffmpeg to convert the posted files to .mp3 format.

  


  app.post('/messages', (req, res) => {
  if (!req.body.message) {
    return res.status(400).json({ error: 'No req.body.message' });
  }
  const messageId = v4();
  writeFile(messageFolder + messageId, req.body.message, 'base64')
  .then(() => {
      console.log('messages was saved!');
      try {
        console.log('attempting to make an mp3 ', audioFolder + messageId);
        const process = new ffmpeg(`${messageFolder}${messageId}`);
        process.then((audio) => {
          console.log('audio is ready to be processed ', audio);
          audio.fnExtractSoundToMP3(`${audioFolder}${messageId}.mp3`, (error, file) => {
            console.log('There is an error ', error);
            console.log('There is a file ', file);
            if (!error) {
              console.log('Audio File ', file);
              const file = file;
              console.log('what a success! ', messageId && messageId, file && file);
              res.status(201).json({
                message: 'Saved message',
              });
            }
          })
        }, (err) => {
          console.log('An error occurred, ', err);
        });
      } catch(e) {
        console.log('error code ', e.code);
        console.log('error message ', e.msg);
      }
  })
  .catch(err => {
    console.log('Error writing message to file', err);
    res.sendStatus(500);
  });
});