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| const Ffmpeg = require(‘fluent-ffmpeg’); | |
| const STREAM_URL = ‘http://icecast.radio24.ch/radio24-rc-96-aac'; | |
| const VOLUME_THRESHOLD = -50; // volume threshold | |
| getMeanVolume(STREAM_URL, function(meanVolume){ | |
| if(meanVolume <= VOLUME_THRESHOLD){ | |
| console.log(“WE HAVE A PROBLEM! VOLUME IS TOO LOW!”); | |
| }else{ | |
| console.log(‘ALL GOOD!’); | |
| } | |
| }); | |
| function getMeanVolume(streamUrl, callback){ | |
| new Ffmpeg({ source: streamUrl }) | |
| .withAudioFilter(‘volumedetect’) | |
| .addOption(‘-f’, ‘null’) | |
| .addOption(‘-t’, ‘10’) // duration | |
| .noVideo() | |
| .on(‘start’, function(ffmpegCommand){ | |
| console.log(‘Output the ffmpeg command’, ffmpegCommand); | |
| }) | |
| .on(‘end’, function(stdout, stderr){ | |
| // find the mean_volume in the output | |
| let meanVolumeRegex = stderr.match(/mean_volume:\s(-?[0–9]\d*(\.\d+)?)/); | |
| // return the mean volume | |
| if(meanVolumeRegex){ | |
| let meanVolume = parseFloat(meanVolumeRegex[1]); | |
| return callback(meanVolume); | |
| } | |
| // if the stream is not available | |
| if(stderr.match(/Server returned 404 Not Found/)){ | |
| return callback(false); | |
| } | |
| }) | |
| .saveToFile(‘/dev/null’); | |
| } |
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