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• FFmpeg volume detection, trim silence in live audio

  4 January 2019, by Heisenbug

  I know that ffmpeg has volume detection functionality.
  Now I’m searching for a way to capture microphone audio and listen constantly without saving any files if there is a volume below my threshold.
  But if there is some sound I want to produce file containing only this sound.
  If there are multiple sounds separated by some time of silence I would like to have them as separate files.
  Can ffmpeg run in this mode and produce my audio outputs?

  I’m aware, that this usecase is not that common. I’m open to other solutions or compromises.
  Can I start audio capture and end it if there is a silence for a certain amount of time?

• Google Speech API - Is there a way to determine if the audio has human voice or not?

  20 December 2019, by stupid_sma

  I am making an audio filtering application at work that reads over hundreds of audio files and filters them. So, if the audio has human voice in it, it will accept it and if it does not- it will delete the audio file.

  I am using ffmpeg to get the details of the audio and add other filters like size and duration and silence (though it is not very accurate in detecting silence for all audio files.)

  My company asked me to try the Google Cloud Speech API to detect if the audio has any human voice in it.

  So with this code, some audio files return a Transcript of spoken words in the audio file, but what I need is to determine if a human is speaking or not.

  I have considered using hark.js for it but there does not seem to be enough documentation and I am short on time!

  Ps. I am an intern and I’m just starting out with programming. I apologize if my question does not make sense or sounds dumb.

     # Includes the autoloader for libraries installed with composer
  
     require __DIR__ . '/vendor/autoload.php';
  
  
  
     # Imports the Google Cloud client library
  
     use Google\Cloud\Speech\V1\SpeechClient;
  
     use Google\Cloud\Speech\V1\RecognitionAudio;
  
     use Google\Cloud\Speech\V1\RecognitionConfig;
  
     use Google\Cloud\Speech\V1\RecognitionConfig\AudioEncoding;
  
  
  
     putenv('GOOGLE_APPLICATION_CREDENTIALS=../../credentials.json');
  
  
  
  
  
  
  
     echo getcwd() . "<br />";
  
     chdir('test-sounds');
  
     echo getcwd() . "<br />";
  
     echo shell_exec('ls -lr');
  
  
  
     $fileList = glob('*');
  
     foreach($fileList as $filename){
  
     //echo $filename, '<br />';
  
  
  
     # The name of the audio file to transcribe
  
     $audioFile = __DIR__ . '/' . $filename;
  
  
  
     # get contents of a file into a string
  
     $content = file_get_contents($audioFile);
  
  
  
     # set string as audio content
  
     $audio = (new RecognitionAudio())
  
         ->setContent($content);
  
  
  
     # The audio file's encoding, sample rate and language
  
     $config = new RecognitionConfig([
  
         'encoding' => AudioEncoding::LINEAR16,
  
         'language_code' => 'ja-JP'
  
     ]);
  
  
  
     # Instantiates a client
  
     $client = new SpeechClient();
  
  
  
     # Detects speech in the audio file
  
     $response = $client->recognize($config, $audio);
  
  
  
     # Print most likely transcription
  
     foreach ($response->getResults() as $result) {
  
         $alternatives = $result->getAlternatives();
  
         $mostLikely = $alternatives[0];
  
         $transcript = $mostLikely->getTranscript();
  
         printf('<br />Transcript: %s' . PHP_EOL, $transcript . '<br />');
  
  
  
     }
  
  
  
     $client->close();
  
  
  
     }
  
  
  
     ?> ```

• ffprobe/ffmpeg detect when video is unplayable

  8 March 2018, by Philip Tenn

  We are calling ffpmeg 2.6.8 through Java to convert different video formats to MP4.

  Is there a way to detect that the resulting MP4 video will be unplayable?

  We’ve explored:

  • stderr. Unfortunately ffmpeg is writing all diagnostic information to stderr.
  • -xerror. I tried it on a file and it stopped converting, but when I tried without this switch, it converted and I could play the resulting MP4 file.
  • exit code. From reading various forums, it sounds like 0 is success, 1 is error, and there are other codes, but that this isn’t completely reliable (we could get an exit code of 0 and video still unplayable).

  Has anyone faced a similar need? Just looking for ideas/suggestions that I could research and explore. Thanks!