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Autres articles (37)

  • Installation en mode ferme

    4 février 2011, par

    Le mode ferme permet d’héberger plusieurs sites de type MediaSPIP en n’installant qu’une seule fois son noyau fonctionnel.
    C’est la méthode que nous utilisons sur cette même plateforme.
    L’utilisation en mode ferme nécessite de connaïtre un peu le mécanisme de SPIP contrairement à la version standalone qui ne nécessite pas réellement de connaissances spécifique puisque l’espace privé habituel de SPIP n’est plus utilisé.
    Dans un premier temps, vous devez avoir installé les mêmes fichiers que l’installation (...)

  • List of compatible distributions

    26 avril 2011, par

    The table below is the list of Linux distributions compatible with the automated installation script of MediaSPIP. Distribution nameVersion nameVersion number Debian Squeeze 6.x.x Debian Weezy 7.x.x Debian Jessie 8.x.x Ubuntu The Precise Pangolin 12.04 LTS Ubuntu The Trusty Tahr 14.04
    If you want to help us improve this list, you can provide us access to a machine whose distribution is not mentioned above or send the necessary fixes to add (...)

  • La sauvegarde automatique de canaux SPIP

    1er avril 2010, par

    Dans le cadre de la mise en place d’une plateforme ouverte, il est important pour les hébergeurs de pouvoir disposer de sauvegardes assez régulières pour parer à tout problème éventuel.
    Pour réaliser cette tâche on se base sur deux plugins SPIP : Saveauto qui permet une sauvegarde régulière de la base de donnée sous la forme d’un dump mysql (utilisable dans phpmyadmin) mes_fichiers_2 qui permet de réaliser une archive au format zip des données importantes du site (les documents, les éléments (...)

Sur d’autres sites (7585)

  • 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));
    
}
    
}

  • Recording voice using HTML5 and processing it with ffmpeg

    22 mars 2015, par user3789242

    I need to use ffmpeg in my javascript/HTML5 project which allows the user to select the format he wants the audio to open with.I don’t know anything about ffmpeg and I’ve been doing lots of research I don’t know how to use it in my project. I found an example https://github.com/sopel39/audioconverter.js but the problem how can I install the ffmpeg.js which is 8 mg to m project. please if someone can help me I’ll be very thankfull
    here is my full code :

    the javascript page :

    // 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));
    
}
    
}

    and here is the html code :

        
    
    
    
    
    
    <code class="echappe-js">&lt;script src=&quot;http://stackoverflow.com/feeds/tag/js/functions.js&quot;&gt;&lt;/script&gt;

    • avcodec/me_cmp : restore author attribution and copyrights

      17 juillet 2014, par Michael Niedermayer
      avcodec/me_cmp : restore author attribution and copyrights

      These where removed by libav in
      

      See : git show -C 2d60444331fca1910510038dd3817bea885c2367
      
diff —git a/libavcodec/dsputil.c b/libavcodec/me_cmp.c
      
similarity index 98%
      
rename from libavcodec/dsputil.c
      
rename to libavcodec/me_cmp.c
      
index ba71a99..9fcc937 100644

      — - a/libavcodec/dsputil.c
      
+++ b/libavcodec/me_cmp.c
      
@@ -1,8 +1,4 @@
      
 /*

      - * DSP utils

      - * Copyright (c) 2000, 2001 Fabrice Bellard

      - * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>

      - *
      
  * This file is part of Libav.
      
  *
      
  * Libav is free software ; you can redistribute it and/or
      

      Signed-off-by : Michael Niedermayer <michaelni@gmx.at>
      • [DH] libavcodec/me_cmp.c

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