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  • Using ffmpeg to convert voice recording captured by HTML5

    8 juillet 2014, par user3789242

    I’m building an HTML5 voice recording software with visualizer.I want the user when recording the voice, and after uploading the file as wave in a blob (server-side), the user should be able to select the audio format of that file using ffmpeg. what I Have achieved so far is uploading the file as wave.what I still want to do is :

    • On the server
    • side pick your preferable web programming framework
    • The web programming framework accepts the upload and stores the file on the server
    • The web programming framework runs a ffmpeg (command line) which processes the file
    • The user can download the processed file

    here is my code so far :

    // variables
    
var leftchannel = [];
    
var rightchannel = [];
    
var recorder = null;
    
var recording = false;
    
var recordingLength = 0;
    
var volume = null;
    
var audioInput = null;
    
var sampleRate = 44100;
    
var audioContext = null;
    
var context = null;
    
var outputString;
    

    

    

    
if (!navigator.getUserMedia)
    
    navigator.getUserMedia = navigator.getUserMedia ||
    
    navigator.webkitGetUserMedia ||
    
    navigator.mozGetUserMedia ||
    
    navigator.msGetUserMedia;
    

    
if (navigator.getUserMedia) {
    
    navigator.getUserMedia({
    
        audio: true
    
    }, success, function (e) {
    
        alert('Error capturing audio.');
    
    });
    
} else alert('getUserMedia not supported in this browser.');
    

    

    

    
function getVal(value) {
    

    
    // if R is pressed, we start recording
    
    if (value == "record") {
    
        recording = true;
    
        // reset the buffers for the new recording
    
        leftchannel.length = rightchannel.length = 0;
    
        recordingLength = 0;
    
        document.getElementById('output').innerHTML = "Recording now...";
    

    
        // if S is pressed, we stop the recording and package the WAV file
    
    } else if (value == "stop") {
    

    
        // we stop recording
    
        recording = false;
    
        document.getElementById('output').innerHTML = "Building wav file...";
    

    
        // we flat the left and right channels down
    
        var leftBuffer = mergeBuffers(leftchannel, recordingLength);
    
        var rightBuffer = mergeBuffers(rightchannel, recordingLength);
    
        // we interleave both channels together
    
        var interleaved = interleave(leftBuffer, rightBuffer);
    

    

    

    
        var buffer = new ArrayBuffer(44 + interleaved.length * 2);
    
        var view = new DataView(buffer);
    

    
        // RIFF chunk descriptor
    
        writeUTFBytes(view, 0, 'RIFF');
    
        view.setUint32(4, 44 + interleaved.length * 2, true);
    
        writeUTFBytes(view, 8, 'WAVE');
    
        // FMT sub-chunk
    
        writeUTFBytes(view, 12, 'fmt ');
    
        view.setUint32(16, 16, true);
    
        view.setUint16(20, 1, true);
    
        // stereo (2 channels)
    
        view.setUint16(22, 2, true);
    
        view.setUint32(24, sampleRate, true);
    
        view.setUint32(28, sampleRate * 4, true);
    
        view.setUint16(32, 4, true);
    
        view.setUint16(34, 16, true);
    
        // data sub-chunk
    
        writeUTFBytes(view, 36, 'data');
    
        view.setUint32(40, interleaved.length * 2, true);
    

    

    
        var lng = interleaved.length;
    
        var index = 44;
    
        var volume = 1;
    
        for (var i = 0; i < lng; i++) {
    
            view.setInt16(index, interleaved[i] * (0x7FFF * volume), true);
    
            index += 2;
    
        }
    

    
        var blob = new Blob([view], {
    
            type: 'audio/wav'
    
        });
    

    
        // let's save it locally
    

    
        document.getElementById('output').innerHTML = 'Handing off the file now...';
    
        var url = (window.URL || window.webkitURL).createObjectURL(blob);
    

    
        var li = document.createElement('li');
    
        var au = document.createElement('audio');
    
        var hf = document.createElement('a');
    

    
        au.controls = true;
    
        au.src = url;
    
        hf.href = url;
    
        hf.download = 'audio_recording_' + new Date().getTime() + '.wav';
    
        hf.innerHTML = hf.download;
    
        li.appendChild(au);
    
        li.appendChild(hf);
    
        recordingList.appendChild(li);
    

    
    }
    
}
    

    

    
function success(e) {
    

    
    audioContext = window.AudioContext || window.webkitAudioContext;
    
    context = new audioContext();
    

    

    
    volume = context.createGain();
    

    
    // creates an audio node from the microphone incoming stream(source)
    
    source = context.createMediaStreamSource(e);
    

    
    // connect the stream(source) to the gain node
    
    source.connect(volume);
    

    
    var bufferSize = 2048;
    

    
    recorder = context.createScriptProcessor(bufferSize, 2, 2);
    

    
    //node for the visualizer
    
    analyser = context.createAnalyser();
    
    analyser.smoothingTimeConstant = 0.3;
    
    analyser.fftSize = 512;
    

    
    splitter = context.createChannelSplitter();
    
    //when recording happens
    
    recorder.onaudioprocess = function (e) {
    

    
        if (!recording) return;
    
        var left = e.inputBuffer.getChannelData(0);
    
        var right = e.inputBuffer.getChannelData(1);
    

    
        leftchannel.push(new Float32Array(left));
    
        rightchannel.push(new Float32Array(right));
    
        recordingLength += bufferSize;
    

    
        // get the average for the first channel
    
        var array = new Uint8Array(analyser.frequencyBinCount);
    
        analyser.getByteFrequencyData(array);
    

    
        var c = document.getElementById("myCanvas");
    
        var ctx = c.getContext("2d");
    
        // clear the current state
    
        ctx.clearRect(0, 0, 1000, 325);
    
        var gradient = ctx.createLinearGradient(0, 0, 0, 300);
    
        gradient.addColorStop(1, '#000000');
    
        gradient.addColorStop(0.75, '#ff0000');
    
        gradient.addColorStop(0.25, '#ffff00');
    
        gradient.addColorStop(0, '#ffffff');
    
        // set the fill style
    
        ctx.fillStyle = gradient;
    
        drawSpectrum(array);
    

    
        function drawSpectrum(array) {
    
            for (var i = 0; i < (array.length); i++) {
    
                var value = array[i];
    
                ctx.fillRect(i * 5, 325 - value, 3, 325);
    
            }
    

    
        }
    
    }
    

    
    function getAverageVolume(array) {
    
        var values = 0;
    
        var average;
    

    
        var length = array.length;
    

    
        // get all the frequency amplitudes
    
        for (var i = 0; i < length; i++) {
    
            values += array[i];
    
        }
    

    
        average = values / length;
    
        return average;
    
    }
    

    
    // we connect the recorder(node to destination(speakers))
    
    volume.connect(splitter);
    
    splitter.connect(analyser, 0, 0);
    

    
    analyser.connect(recorder);
    
    recorder.connect(context.destination);
    

    
}
    

    

    

    

    
function mergeBuffers(channelBuffer, recordingLength) {
    
    var result = new Float32Array(recordingLength);
    
    var offset = 0;
    
    var lng = channelBuffer.length;
    
    for (var i = 0; i < lng; i++) {
    
        var buffer = channelBuffer[i];
    
        result.set(buffer, offset);
    
        offset += buffer.length;
    
    }
    
    return result;
    
}
    

    
function interleave(leftChannel, rightChannel) {
    
    var length = leftChannel.length + rightChannel.length;
    
    var result = new Float32Array(length);
    

    
    var inputIndex = 0;
    

    
    for (var index = 0; index < length;) {
    
        result[index++] = leftChannel[inputIndex];
    
        result[index++] = rightChannel[inputIndex];
    
        inputIndex++;
    
    }
    
    return result;
    
}
    

    

    
function writeUTFBytes(view, offset, string) {
    
    var lng = string.length;
    
    for (var i = 0; i < lng; i++) {
    

    
        view.setUint8(offset + i, string.charCodeAt(i));
    
    }
    
}

  • VLC command line : RTSP to mp4 file (video + audio)

    8 février 2016, par Dmitriy Gerashenko

    Win 7 x64.

    When I watch this link in VLC player all is fine :

    rtsp ://184.72.239.149/vod/mp4:BigBuckBunny_175k.mov

    When I try to capture link to file and to display :

    • There is video without sound on display.
    • Created file is not playable.

    Command :

    vlc.exe -vvv "rtsp://184.72.239.149/vod/mp4:BigBuckBunny_175k.mov" --sout="#transcode{venc=ffmpeg,vcodec=mp4v,vfilter=canvas{width=800,height=600},aenc=ffmpeg{strict=-2},acodec=mp4a}:duplicate{dst=display,dst=standard{access=file,mux=mp4,dst=video.mp4}"

    There are some errors in log, for example : MPEG4GenericRTPSource Warning: Unknown or unsupported "mode": AAC-hbr. Is it cause of my problems ? How to solve my issue ?

    Complete log (from VLCJ) :

    cd C:\Users\gda\Documents\NetBeansProjects\Video; "JAVA_HOME=C:\\Program Files (x86)\\Java\\jdk1.8.0_71" cmd /c "\"\"C:\\Users\\gda\\AppData\\Roaming\\NetBeans\\8.0.2\\maven\\bin\\mvn.bat\" -Dexec.args=\"-classpath %classpath ru.cherezweb.app.video.Video\" -Dexec.executable=\"C:\\Program Files (x86)\\Java\\jdk1.8.0_71\\bin\\java.exe\" -Dmaven.ext.class.path=C:\\Users\\gda\\AppData\\Roaming\\NetBeans\\8.0.2\\maven-nblib\\netbeans-eventspy.jar -Dfile.encoding=UTF-8 process-classes org.codehaus.mojo:exec-maven-plugin:1.2.1:exec\""
    
Scanning for projects...
    

    
------------------------------------------------------------------------
    
Building Video 1.0-SNAPSHOT
    
------------------------------------------------------------------------
    

    
--- maven-resources-plugin:2.5:resources (default-resources) @ Video ---
    
[debug] execute contextualize
    
Using 'UTF-8' encoding to copy filtered resources.
    
skip non existing resourceDirectory C:\Users\gda\Documents\NetBeansProjects\Video\src\main\resources
    

    
--- maven-compiler-plugin:2.3.2:compile (default-compile) @ Video ---
    
Nothing to compile - all classes are up to date
    

    
--- exec-maven-plugin:1.2.1:exec (default-cli) @ Video ---
    
20:37:29.097 [main] INFO  uk.co.caprica.vlcj.Info - vlcj: 3.10.1
    
20:37:29.101 [main] INFO  uk.co.caprica.vlcj.Info - java: 1.8.0_71 Oracle Corporation
    
20:37:29.101 [main] INFO  uk.co.caprica.vlcj.Info - java home: C:\Program Files (x86)\Java\jdk1.8.0_71\jre
    
20:37:29.101 [main] INFO  uk.co.caprica.vlcj.Info - os: Windows 10 10.0 x86
    
20:37:29.103 [main] DEBUG u.c.c.vlcj.discovery.NativeDiscovery - discover()
    
20:37:29.103 [main] DEBUG u.c.c.vlcj.discovery.NativeDiscovery - jnaLibraryPath=null
    
20:37:29.103 [main] DEBUG u.c.c.vlcj.discovery.NativeDiscovery - discoveryStrategy=uk.co.caprica.vlcj.discovery.linux.DefaultLinuxNativeDiscoveryStrategy@176c05c
    
20:37:29.104 [main] DEBUG u.c.c.vlcj.discovery.NativeDiscovery - supported=false
    
20:37:29.104 [main] DEBUG u.c.c.vlcj.discovery.NativeDiscovery - discoveryStrategy=uk.co.caprica.vlcj.discovery.windows.DefaultWindowsNativeDiscoveryStrategy@1eb6432
    
20:37:29.104 [main] DEBUG u.c.c.vlcj.discovery.NativeDiscovery - supported=true
    
20:37:29.104 [main] DEBUG u.c.c.v.d.AbstractNativeDiscoveryStrategy - discover()
    
20:37:29.105 [main] DEBUG u.c.c.v.r.windows.WindowsRuntimeUtil - getVlcInstallDir()
    
20:37:29.430 [main] DEBUG u.c.c.v.d.AbstractNativeDiscoveryStrategy - directoryNames=[C:\Program Files (x86)\VideoLAN\VLC, C:\Users\gda\Documents\NetBeansProjects\Video, C:\Program Files\Broadcom\Broadcom 802.11 Network Adapter, C:\Program Files (x86)\Intel\iCLS Client\, C:\Program Files\Intel\iCLS Client\, C:\PROGRAMDATA\ORACLE\JAVA\JAVAPATH, C:\Windows\SYSTEM32, C:\Windows, C:\Windows\SYSTEM32\WBEM, C:\Windows\SYSTEM32\WINDOWSPOWERSHELL\V1.0\, C:\PROGRAM FILES\INTEL\INTEL(R) MANAGEMENT ENGINE COMPONENTS\DAL, C:\PROGRAM FILES\INTEL\INTEL(R) MANAGEMENT ENGINE COMPONENTS\IPT, C:\PROGRAM FILES (X86)\INTEL\INTEL(R) MANAGEMENT ENGINE COMPONENTS\DAL, C:\PROGRAM FILES (X86)\INTEL\INTEL(R) MANAGEMENT ENGINE COMPONENTS\IPT, C:\Program Files\Intel\Intel(R) Management Engine Components\DAL, C:\Program Files\Intel\Intel(R) Management Engine Components\IPT, C:\Program Files (x86)\Intel\Intel(R) Management Engine Components\DAL, C:\Program Files (x86)\Intel\Intel(R) Management Engine Components\IPT, C:\Program Files\WIDCOMM\Bluetooth Software\, C:\Program Files\WIDCOMM\Bluetooth Software\syswow64, C:\Program Files\TortoiseSVN\bin, C:\Program Files (x86)\NVIDIA Corporation\PhysX\Common, C:\Program Files\OpenVPN\bin, C:\WINDOWS\system32, C:\WINDOWS, C:\WINDOWS\System32\Wbem, C:\WINDOWS\System32\WindowsPowerShell\v1.0\, C:\Program Files\TortoiseGit\bin, C:\Program Files (x86)\Skype\Phone\]
    
20:37:29.430 [main] DEBUG u.c.c.v.d.AbstractNativeDiscoveryStrategy - directoryName=C:\Program Files (x86)\VideoLAN\VLC
    
20:37:29.430 [main] DEBUG u.c.c.v.d.AbstractNativeDiscoveryStrategy - Matched 'libvlc.dll' in 'C:\Program Files (x86)\VideoLAN\VLC'
    
20:37:29.430 [main] DEBUG u.c.c.v.d.AbstractNativeDiscoveryStrategy - Matched 'libvlccore.dll' in 'C:\Program Files (x86)\VideoLAN\VLC'
    
20:37:29.430 [main] DEBUG u.c.c.v.d.AbstractNativeDiscoveryStrategy - Matched all required files
    
20:37:29.430 [main] DEBUG u.c.c.v.d.AbstractNativeDiscoveryStrategy - result=C:\Program Files (x86)\VideoLAN\VLC
    
20:37:29.430 [main] DEBUG u.c.c.vlcj.discovery.NativeDiscovery - path=C:\Program Files (x86)\VideoLAN\VLC
    
20:37:29.431 [main] INFO  u.c.c.vlcj.discovery.NativeDiscovery - Discovery found libvlc at 'C:\Program Files (x86)\VideoLAN\VLC'
    
true
    
2.2.1 Terry Pratchett (Weatherwax)
    
20:37:29.490 [main] DEBUG u.c.c.vlcj.player.MediaPlayerFactory - initX=null
    
20:37:29.494 [main] INFO  u.c.c.vlcj.binding.LibVlcFactory - vlc: 2.2.1 Terry Pratchett (Weatherwax), changeset 2.2.1-0-ga425c42
    
20:37:29.494 [main] INFO  u.c.c.vlcj.binding.LibVlcFactory - libvlc: C:\Program Files (x86)\VideoLAN\VLC\libvlc.dll
    
20:37:29.494 [main] DEBUG u.c.c.vlcj.player.MediaPlayerFactory - MediaPlayerFactory(libvlc=Proxy interface to Native Library ,libvlcArgs=[])
    
20:37:29.494 [main] DEBUG u.c.c.vlcj.player.MediaPlayerFactory - jna.library.path=null
    
20:37:29.494 [main] DEBUG u.c.c.vlcj.player.MediaPlayerFactory - VLC_PLUGIN_PATH=null
    
20:37:29.529 [main] DEBUG u.c.c.vlcj.player.MediaPlayerFactory - instance=native@0x1195650 (uk.co.caprica.vlcj.binding.internal.libvlc_instance_t@1195650)
    
20:37:29.529 [main] DEBUG u.c.c.vlcj.player.MediaPlayerFactory - equalizerAvailable=true
    
20:37:29.529 [main] DEBUG u.c.c.vlcj.player.MediaPlayerFactory - createEqualizerBandFrequencies()
    
20:37:29.529 [main] DEBUG u.c.c.vlcj.player.MediaPlayerFactory - numBands=10
    
20:37:29.530 [main] DEBUG u.c.c.vlcj.player.MediaPlayerFactory - result=[31.25, 62.5, 125.0, 250.0, 500.0, 1000.0, 2000.0, 4000.0, 8000.0, 16000.0]
    
20:37:29.530 [main] DEBUG u.c.c.vlcj.player.MediaPlayerFactory - createEqualizerPresetNames()
    
20:37:29.530 [main] DEBUG u.c.c.vlcj.player.MediaPlayerFactory - numPresets=18
    
20:37:29.530 [main] DEBUG u.c.c.vlcj.player.MediaPlayerFactory - result=[Flat, Classical, Club, Dance, Full bass, Full bass and treble, Full treble, Headphones, Large Hall, Live, Party, Pop, Reggae, Rock, Ska, Soft, Soft rock, Techno]
    
20:37:29.530 [main] DEBUG u.c.c.vlcj.player.MediaPlayerFactory - newHeadlessMediaPlayer()
    
20:37:29.538 [main] DEBUG u.c.c.vlcj.player.DefaultMediaPlayer - DefaultMediaPlayer(libvlc=Proxy interface to Native Library , instance=native@0x1195650 (uk.co.caprica.vlcj.binding.internal.libvlc_instance_t@1195650))
    
20:37:29.538 [main] DEBUG u.c.c.vlcj.player.DefaultMediaPlayer - createInstance()
    
20:37:29.543 [main] DEBUG u.c.c.vlcj.player.DefaultMediaPlayer - mediaPlayerInstance=native@0x16853ac4 (uk.co.caprica.vlcj.binding.internal.libvlc_media_player_t@16853ac4)
    
20:37:29.544 [main] DEBUG u.c.c.vlcj.player.DefaultMediaPlayer - mediaPlayerEventManager=native@0x16878818 (uk.co.caprica.vlcj.binding.internal.libvlc_event_manager_t@16878818)
    
20:37:29.544 [main] DEBUG u.c.c.vlcj.player.DefaultMediaPlayer - registerEventListener()
    
20:37:29.546 [main] DEBUG u.c.c.vlcj.player.DefaultMediaPlayer - event=libvlc_MediaPlayerMediaChanged
    
20:37:29.567 [main] DEBUG u.c.c.vlcj.player.DefaultMediaPlayer - result=0
    
20:37:29.567 [main] DEBUG u.c.c.vlcj.player.DefaultMediaPlayer - event=libvlc_MediaPlayerNothingSpecial
    
20:37:29.567 [main] DEBUG u.c.c.vlcj.player.DefaultMediaPlayer - result=0
    
20:37:29.567 [main] DEBUG u.c.c.vlcj.player.DefaultMediaPlayer - event=libvlc_MediaPlayerOpening
    
20:37:29.567 [main] DEBUG u.c.c.vlcj.player.DefaultMediaPlayer - result=0
    
20:37:29.567 [main] DEBUG u.c.c.vlcj.player.DefaultMediaPlayer - event=libvlc_MediaPlayerBuffering
    
20:37:29.567 [main] DEBUG u.c.c.vlcj.player.DefaultMediaPlayer - result=0
    
20:37:29.567 [main] DEBUG u.c.c.vlcj.player.DefaultMediaPlayer - event=libvlc_MediaPlayerPlaying
    
20:37:29.567 [main] DEBUG u.c.c.vlcj.player.DefaultMediaPlayer - result=0
    
20:37:29.567 [main] DEBUG u.c.c.vlcj.player.DefaultMediaPlayer - event=libvlc_MediaPlayerPaused
    
20:37:29.568 [main] DEBUG u.c.c.vlcj.player.DefaultMediaPlayer - result=0
    
20:37:29.568 [main] DEBUG u.c.c.vlcj.player.DefaultMediaPlayer - event=libvlc_MediaPlayerStopped
    
20:37:29.568 [main] DEBUG u.c.c.vlcj.player.DefaultMediaPlayer - result=0
    
20:37:29.568 [main] DEBUG u.c.c.vlcj.player.DefaultMediaPlayer - event=libvlc_MediaPlayerForward
    
20:37:29.568 [main] DEBUG u.c.c.vlcj.player.DefaultMediaPlayer - result=0
    
20:37:29.568 [main] DEBUG u.c.c.vlcj.player.DefaultMediaPlayer - event=libvlc_MediaPlayerBackward
    
20:37:29.568 [main] DEBUG u.c.c.vlcj.player.DefaultMediaPlayer - result=0
    
20:37:29.568 [main] DEBUG u.c.c.vlcj.player.DefaultMediaPlayer - event=libvlc_MediaPlayerEndReached
    
20:37:29.568 [main] DEBUG u.c.c.vlcj.player.DefaultMediaPlayer - result=0
    
20:37:29.569 [main] DEBUG u.c.c.vlcj.player.DefaultMediaPlayer - event=libvlc_MediaPlayerEncounteredError
    
20:37:29.569 [main] DEBUG u.c.c.vlcj.player.DefaultMediaPlayer - result=0
    
20:37:29.569 [main] DEBUG u.c.c.vlcj.player.DefaultMediaPlayer - event=libvlc_MediaPlayerTimeChanged
    
20:37:29.569 [main] DEBUG u.c.c.vlcj.player.DefaultMediaPlayer - result=0
    
20:37:29.569 [main] DEBUG u.c.c.vlcj.player.DefaultMediaPlayer - event=libvlc_MediaPlayerPositionChanged
    
20:37:29.569 [main] DEBUG u.c.c.vlcj.player.DefaultMediaPlayer - result=0
    
20:37:29.569 [main] DEBUG u.c.c.vlcj.player.DefaultMediaPlayer - event=libvlc_MediaPlayerSeekableChanged
    
20:37:29.569 [main] DEBUG u.c.c.vlcj.player.DefaultMediaPlayer - result=0
    
20:37:29.569 [main] DEBUG u.c.c.vlcj.player.DefaultMediaPlayer - event=libvlc_MediaPlayerPausableChanged
    
20:37:29.569 [main] DEBUG u.c.c.vlcj.player.DefaultMediaPlayer - result=0
    
20:37:29.569 [main] DEBUG u.c.c.vlcj.player.DefaultMediaPlayer - event=libvlc_MediaPlayerTitleChanged
    
20:37:29.569 [main] DEBUG u.c.c.vlcj.player.DefaultMediaPlayer - result=0
    
20:37:29.569 [main] DEBUG u.c.c.vlcj.player.DefaultMediaPlayer - event=libvlc_MediaPlayerSnapshotTaken
    
20:37:29.570 [main] DEBUG u.c.c.vlcj.player.DefaultMediaPlayer - result=0
    
20:37:29.570 [main] DEBUG u.c.c.vlcj.player.DefaultMediaPlayer - event=libvlc_MediaPlayerLengthChanged
    
20:37:29.570 [main] DEBUG u.c.c.vlcj.player.DefaultMediaPlayer - result=0
    
20:37:29.570 [main] DEBUG u.c.c.vlcj.player.DefaultMediaPlayer - event=libvlc_MediaPlayerVout
    
20:37:29.570 [main] DEBUG u.c.c.vlcj.player.DefaultMediaPlayer - result=0
    
20:37:29.570 [main] DEBUG u.c.c.vlcj.player.DefaultMediaPlayer - event=libvlc_MediaPlayerScrambledChanged
    
20:37:29.570 [main] DEBUG u.c.c.vlcj.player.DefaultMediaPlayer - result=0
    
20:37:29.572 [main] DEBUG u.c.c.vlcj.player.DefaultMediaPlayer - playMedia(mrl=rtsp://184.72.239.149/vod/mp4:BigBuckBunny_175k.mov,mediaOptions=[:sout=#transcode{venc=ffmpeg,vcodec=mp4v,vfilter=canvas{width=800,height=600},aenc=ffmpeg{strict=-2},acodec=mp4a}:duplicate{dst=display,dst=standard{access=file,mux=mp4,dst=yahoo.m4v}}])
    
20:37:29.573 [main] DEBUG u.c.c.v.player.MediaResourceLocator - encodeMrl(mrl=rtsp://184.72.239.149/vod/mp4:BigBuckBunny_175k.mov)
    
20:37:29.573 [main] DEBUG u.c.c.v.player.MediaResourceLocator - MRL does not contain any Unicode characters
    
20:37:29.573 [main] DEBUG u.c.c.v.player.MediaResourceLocator - result=rtsp://184.72.239.149/vod/mp4:BigBuckBunny_175k.mov
    
20:37:29.574 [main] DEBUG u.c.c.vlcj.player.DefaultMediaPlayer - playMedia(media=SimpleMedia[mrl=rtsp://184.72.239.149/vod/mp4:BigBuckBunny_175k.mov,mediaOptions=[Ljava.lang.String;@17c74e5])
    
20:37:29.574 [main] DEBUG u.c.c.vlcj.player.DefaultMediaPlayer - prepareMedia(media=SimpleMedia[mrl=rtsp://184.72.239.149/vod/mp4:BigBuckBunny_175k.mov,mediaOptions=[Ljava.lang.String;@17c74e5])
    
20:37:29.574 [main] DEBUG u.c.c.vlcj.player.DefaultMediaPlayer - setMedia(media=SimpleMedia[mrl=rtsp://184.72.239.149/vod/mp4:BigBuckBunny_175k.mov,mediaOptions=[Ljava.lang.String;@17c74e5])
    
20:37:29.574 [main] DEBUG u.c.c.vlcj.player.DefaultMediaPlayer - createMediaInstance(media=SimpleMedia[mrl=rtsp://184.72.239.149/vod/mp4:BigBuckBunny_175k.mov,mediaOptions=[Ljava.lang.String;@17c74e5])
    
20:37:29.574 [main] DEBUG u.c.c.vlcj.player.DefaultMediaPlayer - Treating mrl as a location
    
20:37:29.574 [main] DEBUG u.c.c.vlcj.player.DefaultMediaPlayer - mediaInstance=native@0x16876500 (uk.co.caprica.vlcj.binding.internal.libvlc_media_t@16876500)
    
20:37:29.574 [main] DEBUG u.c.c.vlcj.player.DefaultMediaPlayer - mediaOption=:sout=#transcode{venc=ffmpeg,vcodec=mp4v,vfilter=canvas{width=800,height=600},aenc=ffmpeg{strict=-2},acodec=mp4a}:duplicate{dst=display,dst=standard{access=file,mux=mp4,dst=yahoo.m4v}}
    
20:37:29.575 [main] DEBUG u.c.c.vlcj.player.DefaultMediaPlayer - registerMediaEventListener()
    
20:37:29.575 [main] DEBUG u.c.c.vlcj.player.DefaultMediaPlayer - event=libvlc_MediaMetaChanged
    
20:37:29.575 [main] DEBUG u.c.c.vlcj.player.DefaultMediaPlayer - result=0
    
20:37:29.575 [main] DEBUG u.c.c.vlcj.player.DefaultMediaPlayer - event=libvlc_MediaSubItemAdded
    
20:37:29.575 [main] DEBUG u.c.c.vlcj.player.DefaultMediaPlayer - result=0
    
20:37:29.576 [main] DEBUG u.c.c.vlcj.player.DefaultMediaPlayer - event=libvlc_MediaDurationChanged
    
20:37:29.576 [main] DEBUG u.c.c.vlcj.player.DefaultMediaPlayer - result=0
    
20:37:29.576 [main] DEBUG u.c.c.vlcj.player.DefaultMediaPlayer - event=libvlc_MediaParsedChanged
    
20:37:29.576 [main] DEBUG u.c.c.vlcj.player.DefaultMediaPlayer - result=0
    
20:37:29.576 [main] DEBUG u.c.c.vlcj.player.DefaultMediaPlayer - event=libvlc_MediaFreed
    
20:37:29.576 [main] DEBUG u.c.c.vlcj.player.DefaultMediaPlayer - result=0
    
20:37:29.576 [main] DEBUG u.c.c.vlcj.player.DefaultMediaPlayer - event=libvlc_MediaStateChanged
    
20:37:29.576 [main] DEBUG u.c.c.vlcj.player.DefaultMediaPlayer - result=0
    
20:37:29.576 [main] DEBUG u.c.c.vlcj.player.DefaultMediaPlayer - event=libvlc_MediaSubItemTreeAdded
    
20:37:29.576 [main] DEBUG u.c.c.vlcj.player.DefaultMediaPlayer - result=0
    
20:37:29.585 [main] DEBUG u.c.c.vlcj.player.DefaultMediaPlayer - mrl(mediaInstance=native@0x16876500 (uk.co.caprica.vlcj.binding.internal.libvlc_media_t@16876500))
    
20:37:29.587 [pool-2-thread-1] DEBUG u.c.c.vlcj.player.DefaultMediaPlayer - mediaChanged(mediaPlayer=uk.co.caprica.vlcj.player.headless.DefaultHeadlessMediaPlayer@1727f27,media=native@0x16876500 (uk.co.caprica.vlcj.binding.internal.libvlc_media_t@16876500),mrl=rtsp://184.72.239.149/vod/mp4:BigBuckBunny_175k.mov)
    
20:37:29.588 [pool-2-thread-1] DEBUG u.c.c.vlcj.player.DefaultMediaPlayer - Raising event for new media
    
20:37:29.588 [main] DEBUG u.c.c.vlcj.player.DefaultMediaPlayer - result=true
    
20:37:29.588 [main] DEBUG u.c.c.vlcj.player.DefaultMediaPlayer - play()
    
20:37:29.593 [main] DEBUG u.c.c.vlcj.player.DefaultMediaPlayer - after play
    
MPEG4GenericRTPSource Warning: Unknown or unsupported "mode": AAC-hbr
    
[1682c9cc] core input error: ES_OUT_RESET_PCR called
    
[16f79744] core decoder error: cannot continue streaming due to errors
    
[1682c9cc] core input error: ES_OUT_RESET_PCR called
    
[h264 @ 1702ba80] decode_slice_header error
    
[h264 @ 1702ba80] decode_slice_header error
    
[16828134] stream_out_transcode stream out: input interval 41666 (base 2)
    
[16828134] stream_out_transcode stream out: output interval 41666 (base 1)

  • audio convert to mp3,pcm and vox using ffmpeg

    8 juillet 2014, par user3789242

    Please can someone help me with the code for ffmpeg.
    I have to use ffmpeg to convert a recorder voice (using HTML5) into mp3,pcm or vox depending on the user’s selection.
    I don’t know how to write the code for ffmpeg if some one can help me with the code or libraries.
    Thank you in advance.

    Here is my code for recording the voice with a visualizer :

    // variables
    
var leftchannel = [];
    
var rightchannel = [];
    
var recorder = null;
    
var recording = false;
    
var recordingLength = 0;
    
var volume = null;
    
var audioInput = null;
    
var sampleRate = 44100;
    
var audioContext = null;
    
var context = null;
    
var outputString;
    

    

    

    
if (!navigator.getUserMedia)
    
   navigator.getUserMedia = navigator.getUserMedia ||
    
                         navigator.webkitGetUserMedia ||
    
                         navigator.mozGetUserMedia || 
    
                         navigator.msGetUserMedia;
    

    
 if (navigator.getUserMedia){
    
navigator.getUserMedia({audio:true}, success, function(e) {
    
alert('Error capturing audio.');
    
});
    
} else alert('getUserMedia not supported in this browser.');
    

    

    

    
function getVal(value)
    
  {
    

    
// if R is pressed, we start recording
    
if ( value == "record"){
    
    recording = true;
    
    // reset the buffers for the new recording
    
    leftchannel.length = rightchannel.length = 0;
    
    recordingLength = 0;
    
    document.getElementById('output').innerHTML="Recording now...";
    

    
// if S is pressed, we stop the recording and package the WAV file
    
} else if ( value == "stop" ){
    

    
    // we stop recording
    
    recording = false;
    
    document.getElementById('output').innerHTML="Building wav file...";
    

    
    // we flat the left and right channels down
    
    var leftBuffer = mergeBuffers ( leftchannel, recordingLength );
    
    var rightBuffer = mergeBuffers ( rightchannel, recordingLength );
    
    // we interleave both channels together
    
    var interleaved = interleave ( leftBuffer, rightBuffer );
    

    

    

    
    var buffer = new ArrayBuffer(44 + interleaved.length * 2);
    
    var view = new DataView(buffer);
    

    
    // RIFF chunk descriptor
    
    writeUTFBytes(view, 0, 'RIFF');
    
    view.setUint32(4, 44 + interleaved.length * 2, true);
    
    writeUTFBytes(view, 8, 'WAVE');
    
    // FMT sub-chunk
    
    writeUTFBytes(view, 12, 'fmt ');
    
    view.setUint32(16, 16, true);
    
    view.setUint16(20, 1, true);
    
    // stereo (2 channels)
    
    view.setUint16(22, 2, true);
    
    view.setUint32(24, sampleRate, true);
    
    view.setUint32(28, sampleRate * 4, true);
    
    view.setUint16(32, 4, true);
    
    view.setUint16(34, 16, true);
    
    // data sub-chunk
    
    writeUTFBytes(view, 36, 'data');
    
    view.setUint32(40, interleaved.length * 2, true);
    

    

    
    var lng = interleaved.length;
    
    var index = 44;
    
    var volume = 1;
    
    for (var i = 0; i < lng; i++){
    
        view.setInt16(index, interleaved[i] * (0x7FFF * volume), true);
    
        index += 2;
    
    }
    

    
    var blob = new Blob ( [ view ], { type : 'audio/wav' } );
    

    
    // let's save it locally
    

    
    document.getElementById('output').innerHTML='Handing off the file now...';
    
    var url = (window.URL || window.webkitURL).createObjectURL(blob);
    

    
    var li = document.createElement('li');
    
    var au = document.createElement('audio');
    
    var hf = document.createElement('a');
    

    
    au.controls = true;
    
    au.src = url;
    
    hf.href = url;
    
    hf.download = 'audio_recording_' + new Date().getTime() + '.wav';
    
    hf.innerHTML = hf.download;
    
    li.appendChild(au);
    
    li.appendChild(hf);
    
    recordingList.appendChild(li);
    

    
}
    
}
    

    

    
function success(e){
    

    
audioContext = window.AudioContext || window.webkitAudioContext;
    
context = new audioContext();
    

    

    
volume = context.createGain();
    

    
// creates an audio node from the microphone incoming stream(source)
    
source = context.createMediaStreamSource(e);
    

    
// connect the stream(source) to the gain node
    
source.connect(volume);
    

    
var bufferSize = 2048;
    

    
recorder = context.createScriptProcessor(bufferSize, 2, 2);
    

    
//node for the visualizer
    
analyser = context.createAnalyser();
    
analyser.smoothingTimeConstant = 0.3;
    
analyser.fftSize = 512;
    

    
splitter = context.createChannelSplitter();
    
//when recording happens
    
recorder.onaudioprocess = function(e){
    

    
    if (!recording) return;
    
    var left = e.inputBuffer.getChannelData (0);
    
    var right = e.inputBuffer.getChannelData (1);
    

    
    leftchannel.push (new Float32Array (left));
    
    rightchannel.push (new Float32Array (right));
    
    recordingLength += bufferSize;
    

    
    // get the average for the first channel
    
    var array =  new Uint8Array(analyser.frequencyBinCount);
    
    analyser.getByteFrequencyData(array);
    

    
    var c=document.getElementById("myCanvas");
    
    var ctx = c.getContext("2d");
    
    // clear the current state
    
    ctx.clearRect(0, 0, 1000, 325);
    
    var gradient = ctx.createLinearGradient(0,0,0,300);
    
    gradient.addColorStop(1,'#000000');
    
    gradient.addColorStop(0.75,'#ff0000');
    
    gradient.addColorStop(0.25,'#ffff00');
    
    gradient.addColorStop(0,'#ffffff');
    
    // set the fill style
    
    ctx.fillStyle=gradient;
    
    drawSpectrum(array);
    
    function drawSpectrum(array) {
    
        for ( var i = 0; i < (array.length); i++ ){
    
                var value = array[i];
    
                ctx.fillRect(i*5,325-value,3,325);
    
            } 
    

    
    }
    
}
    

    
function getAverageVolume(array) {
    
    var values = 0;
    
    var average;
    

    
    var length = array.length;
    

    
    // get all the frequency amplitudes
    
    for (var i = 0; i < length; i++) {
    
        values += array[i];
    
    }
    

    
    average = values / length;
    
    return average;
    
}
    

    
    // we connect the recorder(node to destination(speakers))
    
    volume.connect(splitter);
    
    splitter.connect(analyser, 0, 0);
    

    
    analyser.connect(recorder);
    
    recorder.connect(context.destination);
    

    
}
    

    

    

    

    
function mergeBuffers(channelBuffer, recordingLength){
    
var result = new Float32Array(recordingLength);
    
var offset = 0;
    
var lng = channelBuffer.length;
    
for (var i = 0; i < lng; i++){
    
var buffer = channelBuffer[i];
    
result.set(buffer, offset);
    
offset += buffer.length;
    
}
    
    return result;
    
   }
    

    
function interleave(leftChannel, rightChannel){  
    
var length = leftChannel.length + rightChannel.length;
    
var result = new Float32Array(length);
    

    
var inputIndex = 0;
    

    
for (var index = 0; index < length; ){
    
result[index++] = leftChannel[inputIndex];
    
result[index++] = rightChannel[inputIndex];
    
inputIndex++;
    
}
    
return result;
    
}
    

    

    
function writeUTFBytes(view, offset, string){ 
    
var lng = string.length;
    
for (var i = 0; i < lng; i++){
    

    
 view.setUint8(offset + i, string.charCodeAt(i));
    
}
    
}

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