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• Using ffmpeg to merge video segments created by the MediaRecorder API

  10 avril 2023, par Dario Cimmino

  I am recording a live video from a webcam using mediarecorder API un chunks of 3 seconds :

  


  startButton.addEventListener('click', () => {
navigator.mediaDevices.getUserMedia({
    video: {
        width: 1280,
        height: 720,
        frameRate: { ideal: 30, max: 30 }
    }
})
    .then(stream => {
        video.srcObject = stream;
        mediaRecorder = new MediaRecorder(stream, { mimeType: 'video/webm' });
        mediaRecorder.ondataavailable = async (event) => {
            const blob = new Blob([event.data], { type: 'video/mp4' });
            const formData = new FormData();
            formData.append('segment', blob, `segment${segmentNumber}.mp4`);

            // When a new video segment is ready
            fetch('http://localhost:3000/upload', {
                method: 'POST',
                body: formData
            })
                .then((response) => response.text())
                .then((result) => {
                    console.log('Upload result:', result);
                })
                .catch((error) => {
                    console.error('Error uploading video segment:', error);
                });
            //Upload data to mysql
            fetch('upload.php', {
                method: 'POST',
                body: formData
            })
                .then(response => response.text())
                .then(result => {
                    console.log('Upload result to MYSQL:', result);
                })
                .catch(error => {
                    console.error('Error uploading video segment to MYSQL:', error);
                });
            segmentNumber++;
        };

        mediaRecorder.start(3000);
    })
    .catch(error => {
        console.error('Error accessing camera:', error);
    });


  


  }) ;

  


  I am left with only the first segment playable, as is expected.

  


  How ever when the recording stops, i'd like to merge all those segments recorded using ffmpeg (or any other) with the help of my nodeJs server.

  


  I am having difficulty understand the parsing of mp4 files.

  


  if I try the command :

  


  ffmpeg -i segment1.mp4 -i segment2.mp4 -i segment3.mp4  out.mp4


  


  I get the following error :

  


      ffmpeg version N-110223-gb18a9c2971-20230410 Copyright (c) 2000-2023 the FFmpeg developers
  built with gcc 12.2.0 (crosstool-NG 1.25.0.152_89671bf)
  configuration: --prefix=/ffbuild/prefix --pkg-config-flags=--static --pkg-config=pkg-config --cross-prefix=x86_64-w64-mingw32- --arch=x86_64 --target-os=mingw32 --enable-gpl --enable-version3 --disable-debug --disable-w32threads --enable-pthreads --enable-iconv --enable-libxml2 --enable-zlib --enable-libfreetype --enable-libfribidi --enable-gmp --enable-lzma --enable-fontconfig --enable-libvorbis --enable-opencl --disable-libpulse --enable-libvmaf --disable-libxcb --disable-xlib --enable-amf --enable-libaom --enable-libaribb24 --enable-avisynth --enable-chromaprint --enable-libdav1d --enable-libdavs2 --disable-libfdk-aac --enable-ffnvcodec --enable-cuda-llvm --enable-frei0r --enable-libgme --enable-libkvazaar --enable-libass --enable-libbluray --enable-libjxl --enable-libmp3lame --enable-libopus --enable-librist --enable-libssh --enable-libtheora --enable-libvpx --enable-libwebp --enable-lv2 --disable-libmfx --enable-libvpl --enable-openal --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenh264 --enable-libopenjpeg --enable-libopenmpt --enable-librav1e --enable-librubberband --enable-schannel --enable-sdl2 --enable-libsoxr --enable-libsrt --enable-libsvtav1 --enable-libtwolame --enable-libuavs3d --disable-libdrm --disable-vaapi --enable-libvidstab --enable-vulkan --enable-libshaderc --enable-libplacebo --enable-libx264 --enable-libx265 --enable-libxavs2 --enable-libxvid --enable-libzimg --enable-libzvbi --extra-cflags=-DLIBTWOLAME_STATIC --extra-cxxflags= --extra-ldflags=-pthread --extra-ldexeflags= --extra-libs=-lgomp --extra-version=20230410
  libavutil      58.  6.100 / 58.  6.100
  libavcodec     60.  9.100 / 60.  9.100
  libavformat    60.  4.101 / 60.  4.101
  libavdevice    60.  2.100 / 60.  2.100
  libavfilter     9.  5.100 /  9.  5.100
  libswscale      7.  2.100 /  7.  2.100
  libswresample   4. 11.100 /  4. 11.100
  libpostproc    57.  2.100 / 57.  2.100
Input #0, matroska,webm, from 'segment1.mp4':
  Metadata:
    encoder         : Chrome
  Duration: N/A, start: 0.000000, bitrate: N/A
  Stream #0:0(eng): Video: h264 (Constrained Baseline), yuv420p(progressive), 1280x720 [SAR 1:1 DAR 16:9], 30.30 fps, 30 tbr, 1k tbn (default)
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001d93cf25fc0] Format mov,mp4,m4a,3gp,3g2,mj2 detected only with low score of 1, misdetection possible!
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001d93cf25fc0] moov atom not found
segment2.mp4: Invalid data found when processing input


  


  any help or inputs are appreciated. THanks !

  


• Can ffmpeg concatenate mp3 files using the process at audio-joiner.com ?

  7 juin 2020, par Ed999

  I have a dozen or more mp3 audio files, which I need to concatenate into a single mp3 file. The files all have the same bitrate (320 kbps) and sample rate (44.1 kHz), but all of them have differing durations.

  



  I have studied the three methods of concatenation recommended on stackoverflow (How to concatenate two MP4 files using FFmpeg). One method actually works, but when I play back the output file I find that there are noticeable audio artifacts (audible glitches) at each join point.

  



  I've been told that this problem is caused by the input files not having identical duration. This seems likely, because I've had some successes in concatenating audio files with identical bit rate, sample rate, and duration.

  



  I have seen, online, some much more complex scripts which are, at present, miles beyond my understanding. One solution I was directed to required a fairly deep knowledge of Python !

  



  However, my research also included a site at audio-joiner.com - and this had the only completely successful method I've yet found, for files of non-identical duration. That site processed some of my input files, joined the multiple files into one, and the concatenated output file it produced did not have any audible glitches at the joins.

  



  I looked into the process the site was using, hoping to get a clue as to where I've been going wrong, but the script on the site (which looks like ajax-based javascript) is too complex for me to follow.

  



  Because the process seemed to take quite a long time, I wouldn't be too surprised to learn that the mp3 input files are being converted to some other audio format, joined, then converted back to mp3 for the output. But if so, that wouldn't put me off using the process.

  



  Is anyone familiar with the approach being used, and can say whether it might be reproducible using ffmpeg ?

  



  .

  



  ADDED -

  



  There are 7 scripts, in all, listed in the source of the relevant page :

  



  https://pagead2.googlesyndication.com/pagead/js/adsbygoogle.js
https://cdnjs.cloudflare.com/ajax/libs/jquery/1.12.0/jquery.min.js
https://static.123apps.com/js/socket.io.js
https://static.123apps.com/js/shared_0.js
https://static.123apps.com/js/shared_1.js
https://static.123apps.com/js/ajoiner.js
https://ajax.googleapis.com/ajax/libs/swfobject/2.2/swfobject.js


  



  .

  



  ADDED -

  



  The successful (javascript) function seems to be this, but it isn't obvious to me why it is succeeding (too complex for me !). Can anyone suggest what approach it is taking ? For example, is it transcoding the mp3 files to an intermediate format, and concatenating the intermediate files ?

  



  function start_join(e){
  l("start_join():"),l(e);
  var t;
  return(t=$.parseJSON(e)) && $("#ajoiner").ajoiner("set_params",t),!0
}

function cancel_join(e){
  return l("cancel_join():"),l(e),!0
}

!function(o){
  var t={
    init:function(e){
      var t=o(this),n=o.extend({lang:{cancel:"Cancel",download:"Download"}},e);
      o(this).data("ajoiner",{o:n,tmp_i:1,pid:-1,params:{}});
      t.data("ajoiner");
      t.ajoiner("_connect"),o("body").bind("socket_connected",function(){t.ajoiner("_connect")})
    },set_params:function(e){
      var t=o(this).data("ajoiner");
      isset(e)?(e.uid=Cookies.get("uid"),t.params=e,t.params.lang_id=lang_id,t.params.host=location.hostname,t.params.hostprotocol=location.protocol,l("socket emit join:"),l(t.params),socket.emit("join",t.params)):error("set_params: params not set")
    },_connect:function(){

      var t=o(this).data("ajoiner");

      l("_connect"),socket.on("join",function(e){
        "progress"==e.message_type?(t.tmp_i,t.tmp_i++,void 0!==getObj("theSWF")&&(getObj("theSWF").set_join_progress(parseInt(e.progress_value)),l("SWF.set_join_progress("+parseInt(e.progress_value)+")")),isset(e.pid)&&(t.pid=e.pid)):"final_result"==e.message_type?(void(e.tmp_i=0)!==getObj("theSWF")&&(getObj("theSWF").join_finished(o.stringifyJSON(e)),l("SWF.join_finished('"+o.stringifyJSON(e)+"')")),last_conv_result=e):"error"==e.message_type&&l(e.error_desc)
      }
    )},_cancel_convert:function(){
      var e=o(this).data("ajoiner");
      0code>

  


• Thumbnail is not created in php

  21 novembre 2014, par Desipicforu Blogspot

  I am writing this code to create thumbnail of uploaded video. Video is successfully created but thumbnail is not crated to directory.

  There is no error in apache error log file. And when i run this command in terminal thumbnail is successfully created to my directory, But it’s not working by php.

  Here is my code :-

              <?php
  
              if(isset($_REQUEST['AddFiles'])){
  
              $targetFolder = 'uploads'; //Path to the Uploads Folder 
  
                  if (!empty($_FILES)) {
  
                      for($i=0;$i' .  uniqid().".".$info->getExtension();
  
                          $fileParts = pathinfo($_FILES['upload_file']['name'][$i]);
  
                          if(isset($fileParts['extension'])){
  
                              //if (in_array($fileParts['extension'],$fileTypes)) 
  
                              {
  
                                  move_uploaded_file($tempFile,$targetFile);
  
                                  echo '<div class="success">'.$_FILES['upload_file']['name'][$i].' was saved successfully inside '.  $_SERVER['HTTP_HOST']."/". dirname($_SERVER["REQUEST_URI"])."/".$targetFile.' Directory</div>';
  
                                  $videoUrl=$_SERVER['HTTP_HOST']."/". dirname($_SERVER["REQUEST_URI"])."/".$targetFile;
  
                                  $servername = "localhost";
  
                                  $username = "root";
  
                                  $password = "root";
  
                                  $dbname = "a7630155_google";
  
  
  
              // Create connection
  
              $conn = new mysqli($servername, $username, $password, $dbname);
  
              // Check connection
  
              if ($conn->connect_error) {
  
                  die("Connection failed: " . $conn->connect_error);
  
              } 
  
  
  
              $sql = "INSERT INTO video (title, artist, duration,thumb_url,video)
  
              VALUES ('".$_REQUEST['videoName']."', '".$_REQUEST['category']."','', 'john@example.com','".$videoUrl."')";
  
  
  
              if ($conn->query($sql) === TRUE) {
  
  
  
                                  // where ffmpeg is located  
  
                              $ffmpeg = '/usr/bin/ffmpeg';  
  
                              //video dir  
  
                              $video = "http://".$videoUrl;  
  
                              //where to save the image  
  
                              $image = rtrim($targetFolder,'/');  
  
                              //time to take screenshot at  
  
                              $interval = 5;  
  
                              //screenshot size  
  
                              $size = '640x480';  
  
                              //ffmpeg command  
  
                              $cmd = "$ffmpeg -i $video -deinterlace -an -ss $interval -f mjpeg -t 1 -r 1 -y -s $size $image 2>&amp;1";
  
  
  
                              shell_exec($cmd);
  
                  echo $cmd;
  
              exit;
  
                  echo "New record created successfully";
  
              } else {
  
                  echo "Error: " . $sql . "<br />" . $conn->error;
  
              }
  
  
  
              $conn->close();
  
  
  
  
  
                              }
  
                              /*else{
  
                                  echo '<div class="fail">'.$_FILES['upload_file']['name'][$i].' couldn\'t be saved because of invalid file type.</div>';
  
                              }*/
  
                          }else{
  
                              echo '<div class="fail">'.$_FILES['upload_file']['name'][$i].' couldn\'t be saved because of invalid file type.</div>';
  
                          }
  
                      }
  
                  }
  
              }
  
  
  
              ?>
  
              
  
                  
  
                  <code class="echappe-js">&lt;script src=&quot;//code.jquery.com/jquery-1.10.2.min.js&quot; type=&quot;text/javascript&quot;&gt;&lt;/script&gt;
  &lt;script&gt;<br />
  
                      var selDiv = &quot;&quot;;<br />
  
                  document.addEventListener(&quot;DOMContentLoaded&quot;, init, false);<br />
  
  <br />
  
                  function init() {<br />
  
                      document.querySelector('#upload_file').addEventListener('change', handleFileSelect, false);<br />
  
                      selDiv = document.querySelector(&quot;#selectedFiles&quot;);<br />
  
                  }<br />
  
  <br />
  
                  function handleFileSelect(e) {<br />
  
                      if(!e.target.files) return;<br />
  
                      var files = e.target.files;<br />
  
                      for(var i=0; i&lt;files.length; i++) {<br />
  
                          var f = files[i];<br />
  
                          selDiv.innerHTML += &quot;&lt;div class='file_list'&gt;&quot;+f.name + &quot;&lt;/div&gt;&quot;;<br />
  
                      }<br />
  
                              $('#uploadimages').show();<br />
  
                  }<br />
  
  <br />
  
                  $(document).ready(function(){<br />
  
                      $(&quot;#uploadTrigger&quot;).click(function(){<br />
  
                      $(&quot;#upload_file&quot;).click();<br />
  
                          }); <br />
  
                  });<br />
  
  <br />
  
                  &lt;/script&gt;
  
                          
                          
  
                          
  
                              
  
                                  
  
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                                  Video Category
                                  
                                  
  
                                  
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                                    Comedy
                                  
                                  
                              
  
                                  
  
                          Upload Video 
                                  
                                  
  
                          
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