Recherche avancée

Sur d’autres sites (15151)

• Revision 90090 : retour sur r89703 : rétablir l’exclusion automatique des pages dans ...

  10 juin 2015, par brunobergot@… — Log

  retour sur r89703 : rétablir l’exclusion automatique des pages dans les boucles articles
  on veut bien tester que le critère tout *n’est pas* présent (et non l’inverse)

• Calculate in Node audio bitrate given bytes and duration and viceversa

  6 mai 2016, par loretoparisi

  Supposed to not have access to ffmpeg I need a simple way to calculate the bitrate of an audio (or video) file given media length (bytes) and duration (seconds), i.e. the function

  bitrate = MediaInfo.bitrate(bytes, duration);

  Also I need to do the opposite, so that given approximate media bitrate and length I need calculate the duration :

  duration = MediaInfo.duration(bytes, bitrate);

  So, this is my attempt, inspired by bitrate node module :

  var console = {
  
      log: function(s) {
  
        document.getElementById("console").innerHTML += s + "<br />"
  
      }
  
  }
  
  
  
  /**
  
   * Get media file info
  
   * @see https://www.npmjs.com/package/bitrate
  
   * * @author Loreto Parisi (loretoparisi at gmail dot com)
  
   */
  
  var MediaInfo = {
  
  
  
      /** unit divisors */
  
      DIVISORS : {
  
        bps: 0.125,
  
        kbps: 125,
  
        mbps: 125000,
  
        Bps: 1,
  
        KBps: 1000,
  
        MBps: 1000000
  
      },
  
  
  
      /**
  
       * Calcuate approximate bitrate
  
       * @param bytes integer media length in bytes
  
       * @param seconds float media duration
  
       * @param format string: bps|kbps|Bps|KBps|MBps
  
       * @param pos integer decimal approximation
  
      */
  
      bitrate : function(bytes, seconds, format, pos) {
  
              if (typeof format !== 'string') throw new TypeError('Expected \'format\' to be a string')
  
              format = format.replace('/', 'p')
  
  
  
        var divisor = this.DIVISORS[format];
  
              if (!divisor) throw new Error('\'format\' is an invalid string')
  
        var bitrate = bytes / seconds / divisor;
  
        pos=pos||4;
  
  
  
        return (Math.round(bitrate * Math.pow(10,pos)) / Math.pow(10,pos) );
  
  
  
      },
  
  
  
      /**
  
       * Calcuate approximate duration
  
       * @param bytes integer media length in bytes
  
       * @param bitrate float media bitrate per seconds
  
       * @param format string: bps|kbps|Bps|KBps|MBps
  
       * @param pos integer decimal approximation
  
      */
  
      duration : function(bytes, bitrate, format, pos) {
  
        if (typeof format !== 'string') throw new TypeError('Expected \'format\' to be a string')
  
              format = format.replace('/', 'p')
  
  
  
        var divisor = this.DIVISORS[format];
  
        if (!divisor) throw new Error('\'format\' is an invalid string')
  
        var seconds = bytes / bitrate / divisor;
  
        pos=pos||4;
  
  
  
        return (Math.round(seconds * Math.pow(10,pos)) / Math.pow(10,pos) );
  
      }
  
    } //MediaInfo
  
  
  
  // example of usage
  
    var bytes = 57511; // media file size in bytes
  
    var seconds = 20.35 // media file duration in seconds
  
  
  
    // calculate media bitrate given media length and duration
  
    var kilobitsPerSecond = MediaInfo.bitrate(bytes, seconds, 'kbps', 3) // => 326.3
  
    var bitsPerSecond = MediaInfo.bitrate(bytes, seconds, 'bps', 3) // => 326279
  
    var BytesPerSecond = MediaInfo.bitrate(bytes, seconds, 'Bps', 3) // => 40785
  
  
  
    // inverse: calculate media duration given media length and bitrate
  
    var duration = MediaInfo.duration(bytes, kilobitsPerSecond, 'kbps', 3);
  
  
  
    var data = {
  
        bytes : bytes,
  
        seconds : seconds,
  
        kilobitsPerSecond : kilobitsPerSecond + " kb/s",
  
        bitsPerSecond : bitsPerSecond + " b/s",
  
        BytesPerSecond : BytesPerSecond + " B/s",
  
        duration : duration
  
    }
  
  
  
    console.log( JSON.stringify(data, null, 2) );

  <div></div>

  The result media info are

  {
  
      "bytes": 57511,
  
      "seconds": 20.35,
  
      "kilobitsPerSecond": "22.609 kb/s",
  
      "bitsPerSecond": "22608.747 b/s",
  
      "BytesPerSecond": "2826.093 B/s",
  
      "duration": 20.35
  
  }

  while ffmpeg gives

  Duration: 00:00:20.35, start: 0.000000, bitrate: 22 kb/s
  
      Stream #0:0(eng): Audio: aac (mp4a / 0x6134706D), 8000 Hz, mono, fltp, 16 kb/s (default)

  Of course, the problem here is the assumption that I have a fixed bitrate when calculating the duration. But, is there any other way without having ffprobe or lame in node ?

• Anomalie #4296 (Nouveau) : Pas de lien dans un site syndiqué

  22 février 2019, par denis -

  Ce blog est syndiqué http://blog.osp.kitchen/feeds/all.atom.xml mais ne montre pas les liens dans l’interface privé.

  Une boucle SYNDIC_ARTICLES ne renvoie donc rien pour #URL_ARTICLE

  &amp;lt;BOUCLE_test(SYNDIC_ARTICLES){id_syndic}{par date}{inverse}{0,16}&amp;gt;<br />         #TITRE  #URL_ARTICLE<br />&amp;lt;/BOUCLE_test&amp;gt;

  SPIP 3.2.1