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• Is there a way to extract every nth frame from an online video without downloading the entire video ?

  13 avril 2018, par Arif

  I’m looking for a website or app that lets you to download individual frames from a video as jpg without downloading the full thing. If there is no such website or app, is it possible via ffmpeg ?

• JW Player can't play mp4 video downloaded from youtube

  20 janvier 2015, par kheya

  I have doenloaded am mp4 video using IE Realplayer plugin from youtube.
  https://www.youtube.com/watch?v=e3a80c5Ar3Y

  I have a test site on my local machine where I have HTML5 JW Player.

  I download the video and then play locally using realplay to see if it plays.
  I notice that not all mp4 downloads from youtube plays in Realplayer.
  The ones that play in Realplayer also play in JW Player on local website.
  But the mp4 files that don’t play in Realplayer also don’t play in JW player.

  This is the error I get in the player :
  the video playback was aborted due to a corruption problem or because the video used features your browser didnot support mylocalsite/xyz.mp4 undefined

  I tested IE, FF, Chrome. It works nowhere.

  Here is my jw player setup and html :

  <video src="mylocalsite/test.mp4" type="video/mp4" poster="mylocalsite/test.jpg" width="640" height="360"></video>

  player setup :

  var modes = '';
  
  var swfPath = '/content/jw/player.swf';
  
              if (navigator.userAgent.toLowerCase().match(/(android)/) || navigator.userAgent.toLowerCase().match(/(chrom)/)) {                
  
                  modes = [{ type: 'flash', src: swfPath }, { type: "html5"}];
  
              } else {
  
                  modes = [{ type: 'html5' }, { type: 'flash', src: swfPath }, { type: "download"}];
  
              }
  
  
  
  jwplayer('container').setup({                
  
                  'flashplayer': swfPath,                
  
                  'width': '640',
  
                  'height': '360',
  
                  'provider': 'video',
  
                  'modes': modes,                
  
              });

  Here is the details info about the file returned by ffmpeg :

  ffmpeg version 1.1.4 Copyright (c) 2000-2013 the FFmpeg developers
  
    built on Jul 31 2013 02:49:36 with gcc 4.6.2 (GCC)
  
    configuration: --prefix=/c/Users/Administrator/ffmpeg --extra-cflags=-I/c/User
  
  s/Administrator/ffmpeg/include --extra-ldflags=-L/c/Users/Administrator/ffmpeg/l
  
  ib --cpu=i686 --enable-gpl --enable-libfdk-aac --enable-libx264 --enable-nonfree
  
  
  
    libavutil      52. 13.100 / 52. 13.100
  
    libavcodec     54. 86.100 / 54. 86.100
  
    libavformat    54. 59.106 / 54. 59.106
  
    libavdevice    54.  3.102 / 54.  3.102
  
    libavfilter     3. 32.100 /  3. 32.100
  
    libswscale      2.  1.103 /  2.  1.103
  
    libswresample   0. 17.102 /  0. 17.102
  
    libpostproc    52.  2.100 / 52.  2.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'C:\videos\woh.mp4':
  
    Metadata:
  
      major_brand     : dash
  
      minor_version   : 0
  
      compatible_brands: iso6avc1mp41
  
      creation_time   : 2013-09-08 23:34:28
  
    Duration: 00:03:50.96, start: 0.000000, bitrate: 189 kb/s
  
      Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 480x360,
  
  187 kb/s, 25 tbr, 90k tbn, 50 tbc
  
      Metadata:
  
        creation_time   : 2013-09-08 23:34:28
  
        handler_name    : VideoHandler

  What can be causing this issue ?

• Why is the audio recording on Chrome missing duration

  16 août 2019, par Ivan Sedelkin

  I’m sending some user created audio to a server which later passes it to googles speech to text api for transcription. Everything works perfectly on firefox but when I try it on Chrome it doesn’t work. I then installed FFmpeg to check if the metadata somehow changed for the file on chrome and noticed that the duration on the file is tagged "N/A". This does not happen on firefox.

  This is the audio recorded from Chrome

  Input #0, matroska,webm, from 'PATH_TO_FILE':
  
    Metadata:
  
      encoder         : Chrome
  
    Duration: N/A, start: 0.000000, bitrate: N/A
  
      Stream #0:0(eng): Audio: opus, 48000 Hz, mono, fltp (default)

  This is the audio recorded from Firefox

  Input #0, ogg, from 'PATH_TO_FILE':
  
    Duration: 00:00:01.26, start: 0.000000, bitrate: 53 kb/s
  
      Stream #0:0: Audio: opus, 48000 Hz, mono, fltp
  
      Metadata:
  
        ENCODER         : Mozilla68.0

  The audio itself is recorded using the mediarecorder-api where the blob is later converted to base64-url and sent to my server.

  This is the code that I use to record the audio :

  navigator.mediaDevices
  
      .getUserMedia(
  
        // constraints - only audio needed for this app
  
        {
  
          audio: true
  
        }
  
      )
  
  
  
      // Success callback
  
      .then(function(stream) {
  
        console.log(navigator.mediaDevices.getSupportedConstraints());
  
        var mediaRecorder = new MediaRecorder(stream, { sampleRate: 44100 });
  
        var chunks = [];
  
        $(".rec-button")
  
          .mousedown(function() {
  
            console.log("rec start");
  
            $(".rec-button i").addClass("recStart");
  
            mediaRecorder.start();
  
            console.log(mediaRecorder.state);
  
            console.log("recorder started");
  
          })
  
          .mouseup(function() {
  
            console.log("rec end");
  
            $(".rec-button i").removeClass("recStart");
  
            mediaRecorder.stop();
  
            mediaRecorder.ondataavailable = function(e) {
  
              chunks.push(e.data);
  
              var blob = new Blob(chunks, { type: "audio/ogg; codecs=opus" });
  
              var player = document.getElementById("player");
  
              player.src = URL.createObjectURL(blob);
  
              chunks = [];
  
              var reader = new window.FileReader();
  
              reader.readAsDataURL(blob);
  
              reader.onloadend = function() {
  
                var base64 = reader.result;
  
                var audioArr = {
  
                  audio: base64
  
                };
  
                $.ajax({
  
                  url: "http://localhost:4242/api/1.0/post",
  
                  type: "POST",
  
                  contentType: "application/json",
  
                  dataType: "json",
  
                  data: JSON.stringify(audioArr),
  
                  success: function(response) {
  
                    console.log(response);
  
                  },
  
                  error: function(err) {
  
                    console.log(err);
  
                  }
  
                });
  
              };
  
              console.log(mediaRecorder.state);
  
              console.log("recorder stopped");
  
            };
  
          });
  
      })
  
  
  
      // Error callback
  
      .catch(function(err) {
  
        console.log("The following getUserMedia error occured: " + err);
  
      });

  My goal is that the audio file recorded from chrome has a duration so that the google api can transcribe it. If you guys have any way of overcoming this problem I would be grateful