recordrtc

RecordRTC is a server-less (entire client-side) JavaScript library can be used to record WebRTC audio/video media streams. It supports cross-browser audio/video recording. Current experiment: 1. Records audio/video separately as wav/webm 2. POST both fil

npm install recordrtc
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RecordRTC to Node.js

npm install recordrtc

// to run it!
cd ./node_modules/recordrtc/ && node index.js

Make sure that directory names MUST NOT have spaces; e.g.

// invalid directory
C:\Hello Sir\Another\RecordRTC

// valid
C:\Hello-Sir\Another\RecordRTC

// invalid directory
C:\First\Second Dir\Third\RecordRTC

// valid
C:\\First\Second-Dir\Third\RecordRTC

This experiment:

  1. Records audio/video separately as wav/webm
  2. POST both files in single HttpPost-Request to Node.js (FormData)
  3. Node.js code saves both files into disk
  4. Node.js code invokes ffmpeg to merge wav/webm in single "webm" file
  5. The merged webm file's URL is returned using same HTTP-callback for playback!

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Windows Batch File (merger.bat)

merger.bat file is executed to invoke ffmpeg functionalities on windows:

@echo off
"C:\ffmpeg\bin\ffmpeg.exe" -i %1 -itsoffset -00:00:01 -i %2 %3

It is assumed that you already have installed ffmpeg on your system. Though, EXE file is hard-coded to "C:\ffmpeg\bin\ffmpeg.exe" however you can easily edit it according to your own installations.

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.sh file

merger.sh file is executed to invoke ffmpeg functionalities on Mac/Linux/etc.

ffmpeg -i audio-file.wav -itsoffset -00:00:01 -i video-file.webm -map 0:0 -map 1:0 output-file-name.webm

Using Linux; ffmpeg installation is super-easy! You can install DEVEL packages as well.

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How to install ffmpeg on windows?
  1. Download ffmpeg and extract ZIP file
  2. Rename extracted directory to "ffmpeg"
  3. Right click over "My Computer" icon and select "Properties" context-menu option
  4. Select "Advance system settings" from top-left section
  5. Click "Environment Variables..." button from "Advanced" tab
  6. Click "New..." button and in the "Variable name" box, enter "Path".
  7. In the "Variable value" box, enter extracted directory full URI e.g. "C:\ffmpeg"
  8. Click "OK" and done!

http://www.wikihow.com/Install-FFmpeg-on-Windows

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How to install ffmpeg on Mac OSX?

Make sure you have homebrew installed. Then run following command:

brew install ffmpeg --with-libvpx --with-theora --whit-libogg --with-libvorbis
How to test?

In the node.js command prompt window; type node index; then open http://localhost:8000/.

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index.html
<!--
// Muaz Khan     - www.MuazKhan.com
// MIT License   - www.WebRTC-Experiment.com/licence
// Experiments   - github.com/muaz-khan/WebRTC-Experiment
-->

<!DOCTYPE html>
<html>
    <head>
        <meta charset="utf-8" />
        <title>RecordRTC over Node.js</title>
        <script>
            if (location.href.indexOf('file:') == 0) {
                document.write('<h1 style="color:red;">Please load this HTML file on HTTP or HTTPS.</h1>');
            }
        </script>
        <meta http-equiv="content-type" content="text/html; charset=utf-8" />
        <link rel="author" type="text/html" href="https://plus.google.com/+MuazKhan">
        <meta name="author" content="Muaz Khan">
        <script src="https://www.webrtc-experiment.com/RecordRTC.js"> </script>
        <style>
            html { background-color: #f7f7f7; }

            body {
                background-color: white;
                border: 1px solid rgb(15, 158, 238);
                margin: 1% 35%;
                text-align: center;
            }

            hr {
                border: 0;
                border-top: 1px solid rgb(15, 158, 238);
            }

            a {
                color: #2844FA;
                text-decoration: none;
            }

            a:hover, a:focus { color: #1B29A4; }

            a:active { color: #000; }
        </style>
    </head>
    <body>
        <p>
            <video id="camera-preview" controls style="border: 1px solid rgb(15, 158, 238); width: 94%;"></video> 
        </p><hr />

        <div>
            <button id="start-recording">Start Recording</button>
            <button id="stop-recording" disabled="">Stop Recording</button>
        </div>

        <script>
            var startRecording = document.getElementById('start-recording');
            var stopRecording = document.getElementById('stop-recording');
            var cameraPreview = document.getElementById('camera-preview');

            var audio = document.querySelector('audio');

            var isFirefox = !!navigator.mozGetUserMedia;

            var recordAudio, recordVideo;
            startRecording.onclick = function() {
                startRecording.disabled = true;
                navigator.getUserMedia({
                        audio: true,
                        video: true
                    }, function(stream) {
                        cameraPreview.src = window.URL.createObjectURL(stream);
                        cameraPreview.play();

                        recordAudio = RecordRTC(stream, {
                            bufferSize: 16384
                        });

                        if (!isFirefox) {
                            recordVideo = RecordRTC(stream, {
                                type: 'video'
                            });
                        }

                        recordAudio.startRecording();

                        if (!isFirefox) {
                            recordVideo.startRecording();
                        }

                        stopRecording.disabled = false;
                    }, function(error) {
                        alert(JSON.stringify(error));
                    });
            };


            stopRecording.onclick = function() {
                startRecording.disabled = false;
                stopRecording.disabled = true;

                recordAudio.stopRecording(function() {
                    if (isFirefox) onStopRecording();
                });

                if (!isFirefox) {
                    recordVideo.stopRecording();
                    onStopRecording();
                }

                function onStopRecording() {
                    recordAudio.getDataURL(function(audioDataURL) {
                        if (!isFirefox) {
                            recordVideo.getDataURL(function(videoDataURL) {
                                postFiles(audioDataURL, videoDataURL);
                            });
                        } else postFiles(audioDataURL);
                    });
                }
            };

            var fileName;

            function postFiles(audioDataURL, videoDataURL) {
                fileName = getRandomString();
                var files = { };

                files.audio = {
                    name: fileName + (isFirefox ? '.webm' : '.wav'),
                    type: isFirefox ? 'video/webm' : 'audio/wav',
                    contents: audioDataURL
                };

                if (!isFirefox) {
                    files.video = {
                        name: fileName + '.webm',
                        type: 'video/webm',
                        contents: videoDataURL
                    };
                }

                files.isFirefox = isFirefox;

                cameraPreview.src = '';
                cameraPreview.poster = '/ajax-loader.gif';

                xhr('/upload', JSON.stringify(files), function(_fileName) {
                    var href = location.href.substr(0, location.href.lastIndexOf('/') + 1);
                    cameraPreview.src = href + 'uploads/' + _fileName;
                    cameraPreview.play();

                    var h2 = document.createElement('h2');
                    h2.innerHTML = '<a href="' + cameraPreview.src + '">' + cameraPreview.src + '</a>';
                    document.body.appendChild(h2);
                });
            }

            function xhr(url, data, callback) {
                var request = new XMLHttpRequest();
                request.onreadystatechange = function() {
                    if (request.readyState == 4 && request.status == 200) {
                        callback(request.responseText);
                    }
                };
                request.open('POST', url);
                request.send(data);
            }

            window.onbeforeunload = function() {
                startRecording.disabled = false;
            };

            function getRandomString() {
                if (window.crypto) {
                    var a = window.crypto.getRandomValues(new Uint32Array(3)),
                        token = '';
                    for (var i = 0, l = a.length; i < l; i++) token += a[i].toString(36);
                    return token;
                } else {
                    return (Math.random() * new Date().getTime()).toString(36).replace( /\./g , '');
                }
            }
        </script>
    </body>
</html>

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handlers.js
var config = require('./config'),
    fs = require('fs'),
    sys = require('sys'),
    exec = require('child_process').exec;

function home(response) {
    response.writeHead(200, {
        'Content-Type': 'text/html'
    });
    response.end(fs.readFileSync('./static/index.html'));
}

// this function uploads files

function upload(response, postData) {
    var files = JSON.parse(postData);

    // writing audio file to disk
    _upload(response, files.audio);

    if (files.isFirefox) {
        response.statusCode = 200;
        response.writeHead(200, { 'Content-Type': 'application/json' });
        response.end(files.audio.name);
    }

    if (!files.isFirefox) {
        // writing video file to disk
        _upload(response, files.video);

        merge(response, files);
    }
}

// this function merges wav/webm files

function merge(response, files) {
    // detect the current operating system
    var isWin = !!process.platform.match( /^win/ );

    if (isWin) {
        ifWin(response, files);
    } else {
        ifMac(response, files);
    }
}

function _upload(response, file) {
    var fileRootName = file.name.split('.').shift(),
        fileExtension = file.name.split('.').pop(),
        filePathBase = config.upload_dir + '/',
        fileRootNameWithBase = filePathBase + fileRootName,
        filePath = fileRootNameWithBase + '.' + fileExtension,
        fileID = 2,
        fileBuffer;

    while (fs.existsSync(filePath)) {
        filePath = fileRootNameWithBase + '(' + fileID + ').' + fileExtension;
        fileID += 1;
    }

    file.contents = file.contents.split(',').pop();

    fileBuffer = new Buffer(file.contents, "base64");

    fs.writeFileSync(filePath, fileBuffer);
}

function serveStatic(response, pathname) {

    var extension = pathname.split('.').pop(),
        extensionTypes = {
            'js': 'application/javascript',
            'webm': 'video/webm',
            'gif': 'image/gif'
        };

    response.writeHead(200, {
        'Content-Type': extensionTypes[extension]
    });
    if (extensionTypes[extension] == 'video/webm')
        response.end(fs.readFileSync('.' + pathname));
    else
        response.end(fs.readFileSync('./static' + pathname));
}

function ifWin(response, files) {
    // following command tries to merge wav/webm files using ffmpeg
    var merger = __dirname + '\\merger.bat';
    var audioFile = __dirname + '\\uploads\\' + files.audio.name;
    var videoFile = __dirname + '\\uploads\\' + files.video.name;
    var mergedFile = __dirname + '\\uploads\\' + files.audio.name.split('.')[0] + '-merged.webm';

    // if a "directory" has space in its name; below command will fail
    // e.g. "c:\\dir name\\uploads" will fail.
    // it must be like this: "c:\\dir-name\\uploads"
    var command = merger + ', ' + audioFile + " " + videoFile + " " + mergedFile + '';
    exec(command, function (error, stdout, stderr) {
        if (error) {
            console.log(error.stack);
            console.log('Error code: ' + error.code);
            console.log('Signal received: ' + error.signal);
        } else {
            response.statusCode = 200;
            response.writeHead(200, {
                'Content-Type': 'application/json'
            });
            response.end(files.audio.name.split('.')[0] + '-merged.webm');

            fs.unlink(audioFile);
            fs.unlink(videoFile);
        }
    });
}

function ifMac(response, files) {
    // its probably *nix, assume ffmpeg is available
    var audioFile = __dirname + '/uploads/' + files.audio.name;
    var videoFile = __dirname + '/uploads/' + files.video.name;
    var mergedFile = __dirname + '/uploads/' + files.audio.name.split('.')[0] + '-merged.webm';
    var util = require('util'),
        exec = require('child_process').exec;
    //child_process = require('child_process');

    var command = "ffmpeg -i " + audioFile + " -itsoffset -00:00:01 -i " + videoFile + " -map 0:0 -map 1:0 " + mergedFile;

    exec(command, function (error, stdout, stderr) {
        if (stdout) console.log(stdout);
        if (stderr) console.log(stderr);

        if (error) {
            console.log('exec error: ' + error);
            response.statusCode = 404;
            response.end();

        } else {
            response.statusCode = 200;
            response.writeHead(200, {
                'Content-Type': 'application/json'
            });
            response.end(files.audio.name.split('.')[0] + '-merged.webm');

            // removing audio/video files
            fs.unlink(audioFile);
            fs.unlink(videoFile);
        }

    });
}

exports.home = home;
exports.upload = upload;
exports.serveStatic = serveStatic;

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  1. RecordRTC to Node.js
  2. RecordRTC to PHP
  3. RecordRTC to ASP.NET MVC
  4. RecordRTC & HTML-2-Canvas i.e. Canvas/HTML Recording!
  5. MRecordRTC i.e. Multi-RecordRTC!
  6. RecordRTC on Ruby!
  7. RecordRTC over Socket.io

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License

RecordRTC-to-Nodejs is released under MIT licence . Copyright (c) Muaz Khan.

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