node-video-lib

Node.js Video Library / MP4 & FLV parser / MP4 builder / HLS muxer

Limitations

This library works only with MP4 and FLV video files encoded using H.264/H.265 video codecs and AAC audio codec.

Installation

$ npm install node-video-lib

Usage

Parse video file

const fs = require('fs');
const VideoLib = require('node-video-lib');

let fd = fs.openSync('/path/to/file', 'r');
try {
    let movie = VideoLib.MovieParser.parse(fd);
    // Work with movie
    console.log('Duration:', movie.relativeDuration());
} catch (ex) {
    console.error('Error:', ex);
} finally {
    fs.closeSync(fd);
}

Create MPEG-TS chunks

const fs = require('fs');
const VideoLib = require('node-video-lib');

let fd = fs.openSync('/path/to/file', 'r');
try {
    let movie = VideoLib.MovieParser.parse(fd);
    let fragmentList = VideoLib.FragmentListBuilder.build(movie, 5);
    for (let i = 0; i < fragmentList.count(); i++) {
        let fragment = fragmentList.get(i);
        let sampleBuffers = VideoLib.FragmentReader.readSamples(fragment, fd);
        let buffer = VideoLib.HLSPacketizer.packetize(fragment, sampleBuffers);
        // Now buffer contains MPEG-TS chunk
    }
} catch (ex) {
    console.error('Error:', ex);
} finally {
    fs.closeSync(fd);
}

Build MP4 file

const fs = require('fs');
const VideoLib = require('node-video-lib');

let fd = fs.openSync('/path/to/file', 'r');
try {
    let movie = VideoLib.MovieParser.parse(fd);
    let fw = fs.openSync('/path/to/output.mp4', 'w');
    try {
        VideoLib.MP4Builder.build(movie, fd, fw);
    } catch (ex) {
        console.error('Error:', ex);
    } finally {
        fs.closeSync(fw);
    }
} catch (ex) {
    console.error('Error:', ex);
} finally {
    fs.closeSync(fd);
}

Create index file

const fs = require('fs');
const VideoLib = require('node-video-lib');

let fd = fs.openSync('/path/to/file', 'r');
try {
    let movie = VideoLib.MovieParser.parse(fd);
    let fragmentList = VideoLib.FragmentListBuilder.build(movie, 5);
    console.log('Duration:', fragmentList.relativeDuration());
    let fdi = fs.openSync('/path/to/index.idx', 'w');
    try {
        VideoLib.FragmentListIndexer.index(fragmentList, fdi);
    } catch (ex) {
        console.error('Error:', ex);
    } finally {
        fs.closeSync(fdi);
    }
} catch (ex) {
    console.error('Error:', ex);
} finally {
    fs.closeSync(fd);
}

Create MPEG-TS chunks using index file

const fs = require('fs');
const VideoLib = require('node-video-lib');

let fd = fs.openSync('/path/to/file', 'r');
let fdi = fs.openSync('/path/to/index.idx', 'r');
try {
    let fragmentList = VideoLib.FragmentListIndexer.read(fdi);
    console.log('Duration:', fragmentList.relativeDuration());
    for (let i = 0; i < fragmentList.count(); i++) {
        let fragment = fragmentList.get(i);
        let sampleBuffers = VideoLib.FragmentReader.readSamples(fragment, fd);
        let buffer = VideoLib.HLSPacketizer.packetize(fragment, sampleBuffers);
        // Now buffer contains MPEG-TS chunk
    }
} catch (ex) {
    console.error('Error:', ex);
} finally {
    fs.closeSync(fd);
    fs.closeSync(fdi);
}

Classes

MovieParser

A tool for parsing video files (MP4 or FLV).

const MovieParser = require('node-video-lib').MovieParser

Methods:

• parse(source) - Parse video file
  • source <Integer>|<Buffer> - Source (File descriptor or Buffer)
  • Return: <Movie>

MP4Parser

A tool for parsing MP4 video files.

const MP4Parser = require('node-video-lib').MP4Parser

Methods:

• parse(source) - Parse MP4 file
  • source <Integer>|<Buffer> - Source (File descriptor or Buffer)
  • Return: <Movie>
• check(buffer) - Check MP4 header
  • buffer <Buffer> - File header (first 8 bytes)
  • Return: <boolean>

FLVParser

A tool for parsing FLV video files.

const FLVParser = require('node-video-lib').FLVParser

Methods:

• parse(source) - Parse FLV file
  • source <Integer>|<Buffer> - Source (File descriptor or Buffer)
  • Return: <Movie>
• check(buffer) - Check FLV header
  • buffer <Buffer> - File header (first 8 bytes)
  • Return: <boolean>

MP4Builder

A tool for building MP4 video files.

const MP4Builder = require('node-video-lib').MP4Builder

Methods:

• build(movie, source, fd) - Build MP4 file
  • movie <Movie> - Movie
  • source <Integer>|<Buffer> - Source (File descriptor or Buffer)
  • fd <Integer> - File descriptor

HLSPacketizer

A tool for creating MPEG-TS chunks.

const HLSPacketizer = require('node-video-lib').HLSPacketizer

Methods:

• packetize(fragment, sampleBuffers) - Create MPEG-TS chunk from movie fragment
  • fragment <Fragment> - Movie fragment
  • sampleBuffers <Array> - Array of buffers
  • Return: <Buffer>

FragmentListBuilder

A tool for splitting the movie into a list of fragments.

const FragmentListBuilder = require('node-video-lib').FragmentListBuilder

Methods:

• build(movie, fragmentDuration) - Split the movie to a list of fragments with an appropriate duration
  • movie <Movie> - Movie
  • fragmentDuration <Integer> - Fragment duration
  • Return: <FragmentList>

FragmentListIndexer

A tool to work with index files.

const FragmentListIndexer = require('node-video-lib').FragmentListIndexer

Methods:

• index(fragmentList, fd) - Index fragment list
  • fragmentList <FragmentList> - Fragment list
  • fd <Integer> - File descriptor
• read(fd) - Read fragment list from index
  • fd <Integer> - File descriptor
  • Return: <FragmentList>

FragmentReader

A tool for reading samples data of the given movie fragment.

const FragmentReader = require('node-video-lib').FragmentReader

Methods:

• readSamples(fragment, source) - Read samples data
  • fragment <Fragment> - Movie fragment
  • source <Integer>|<Buffer> - Source (File descriptor or Buffer)
  • Return: <Array> Array of buffers

Movie

A movie class

const Movie = require('node-video-lib').Movie

Properties:

• duration <Integer> - Movie duration
• timescale <Integer> - Movie timescale
• tracks <Array> - List of movie tracks

Methods:

• relativeDuration() - Movie duration in seconds
  • Return: <Number>
• resolution() - Video resolution
  • Return: <String>
• size() - Samples size
  • Return: <Integer>
• addTrack(track) - Add a track to the tracks list
  • track <Track> - Track
• videoTrack() - Get the first video track
  • Return: <VideoTrack>
• audioTrack() - Get the first audio track
  • Return: <AudioTrack>
• samples() - Get a list of movie samples ordered by relative timestamp
  • Return: <Array>
• ensureDuration() - Calculate and set duration based on the track durations (only if duration is zero)
  • Return: <Number>

FragmentList

A list of movie fragments class.

const FragmentList = require('node-video-lib').FragmentList

Properties:

• fragmentDuration <Integer> - Target fragment duration
• duration <Integer> - Movie duration
• timescale <Integer> - Movie timescale
• video <Object> - Video info
  • timescale <Integer> - Video timescale
  • codec <String> - Codec string
  • extraData <Buffer> - Video codec information
  • size <Integer> - Video samples size
  • width <Integer> - Video width
  • height <Integer> - Video height
• audio <Object> - Audio info
  • timescale <Integer> - Audio timescale
  • codec <String> - Codec string
  • extraData <Buffer> - Audio codec information
  • size <Integer> - Audio samples size

Methods:

• relativeDuration() - Movie duration in seconds
  • Return: <Number>
• count() - Fragments count
  • Return: <Integer>
• size() - Samples size
  • Return: <Integer>
• get(index) - Get fragment by index
  • Return: <Fragment>

Fragment

A movie fragment class

const Fragment = require('node-video-lib').Fragment

Properties:

• timestamp <Integer> - Fragment timestamp
• duration <Integer> - Fragment duration
• timescale <Integer> - Fragment timescale
• videoExtraData <Buffer> - Video codec information
• audioExtraData <Buffer> - Audio codec information
• samples <Array> - List of fragment samples

Methods:

• relativeTimestamp() - Fragment timestamp in seconds
  • Return: <Number>
• relativeDuration() - Fragment duration in seconds
  • Return: <Number>
• hasVideo() - Fragment has a video track
  • Return: <Boolean>
• hasAudio() - Fragment has an audio track
  • Return: <Boolean>

Track

A general track class

const Track = require('node-video-lib').Track

Properties:

• duration <Integer> - Track duration
• timescale <Integer> - Track timescale
• codec <String> - Codec string
• extraData <Buffer> - Codec information
• samples <Array> - List of track samples

Methods:

• relativeDuration() - Track duration in seconds
  • Return: <Number>
• ensureDuration() - Calculate and set duration based on the sample durations (only if duration is zero)
  • Return: <Number>
• size() - Samples size
  • Return: <Integer>

AudioTrack

An audio track class. Extends the general track class

const AudioTrack = require('node-video-lib').AudioTrack

Properties:

• channels <Integer> - Number of audio channels
• sampleRate <Integer> - Audio sample rate
• sampleSize <Integer> - Audio sample size

VideoTrack

A video track class. Extends the general track class

const VideoTrack = require('node-video-lib').VideoTrack

Properties:

• width <Integer> - Video width
• height <Integer> - Video height

Methods:

• resolution() - Video resolution
  • Return: <String>

Sample

A general video sample class

const Sample = require('node-video-lib').Sample

Properties:

• timestamp <Integer> - Sample timestamp
• timescale <Integer> - Sample timescale
• size <Integer> - Sample size
• offset <Integer> - Sample offset in the file

Methods:

• relativeTimestamp() - Sample timestamp in seconds
  • Return: <Number>

AudioSample

An audio sample class. Extends the general sample class

const AudioSample = require('node-video-lib').AudioSample

VideoSample

A video sample class. Extends the general sample class

const VideoSample = require('node-video-lib').VideoSample

Properties:

• compositionOffset <Integer> - Composition offset
• keyframe <Boolean> - Keyframe flag