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ffmpeg-audio-chop

0.0.0111
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  • License MIT

extract pcm audio data from a video based on start/end time, including spectrum and pitch

Package Exports

  • ffmpeg-audio-chop
  • ffmpeg-audio-chop/index.js

This package does not declare an exports field, so the exports above have been automatically detected and optimized by JSPM instead. If any package subpath is missing, it is recommended to post an issue to the original package (ffmpeg-audio-chop) to support the "exports" field. If that is not possible, create a JSPM override to customize the exports field for this package.

Readme

ffmpeg-audio-chop

extract pcm audio data from a video based on start/end time, including spectrum and pitch

Installation

npm i ffmpeg-audio-chop

Usage

//getAudioDataFromVideo(fileName, onDone) //onDone(err,{audioDataChannels, audioSampleRate, metaData, durationSeconds})
//getAudioDataFromVideoSync
//extractAudioForTimespan(audioDataObj, timeStartSeconds, timeEndSeconds, includeFft? = false, fftSize? = 1024, includePitch? = false)
//getDuration(fileName, cb) //cb(err, durationSeconds, audioSampleRate, metadata);
//getDurationSync

var ac = require('ffmpeg-audio-chop');
var audioDataObj = ac.getAudioDataFromVideoSync("./music-video.mp4");
var audioForTime = ac.extractAudioForTimespan(audioDataObj, 5, 5.1, true, 1024, true)

console.log(audioForTime);

// {
//     left: [
//         0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
//         ...
//     ],
//     right: [
//          0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
//          ...
//      ],
//     right_pitch: 486.91126777503007, //audio pitch in hertz
//     left_pitch: 486.91127579714805, //audio pitch in hertz
//     right_spectrum: [
//         0.0024631179044465466,   0.002633626820233918,   0.004308997766344232,
//         0.00043984076475247623,  0.0033481802255052296,    0.00837681817671101, ... ]
//     left_spectrum: [
//         0.0024631179044465466,   0.002633626820233918,   0.004308997766344232,
//         0.00043984076475247623,  0.0033481802255052296,    0.00837681817671101, ... ]
//     min: -0.49687185277871027, //this is a global min
//     max: 0.4622638630329295 //this is a global max
// }

console.log(audioDataObj);

// {
//     min: -0.49687185277871027,
//     max: 0.4622638630329295,
//     audioDataChannels: {
//          left: [0,0,0,0....],
//          right: [0,0,0,...]
//      },
//     audioSampleRate: 44100,
//         metaData: {
//     streams: [ [Object], [Object] ],
//         format: {
//         filename: './b12.mp4',
//             nb_streams: 2,
//             nb_programs: 0,
//             format_name: 'mov,mp4,m4a,3gp,3g2,mj2',
//             format_long_name: 'QuickTime / MOV',
//             start_time: 0,
//             duration: 122.949656,
//             size: 17577178,
//             bit_rate: 1143699,
//             probe_score: 100,
//             tags: [Object]
//     },
//     chapters: []
// },
//     durationSeconds: 122.949656
// }

See Also

stonks