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• Extract the first 2 minutes of video without re-encoding - ffmpeg

  8 juillet 2015, par Code_Ed_Student

  I am seeking a fast and efficient way of extracting the first two minutes of a video. Below script finds the nearest keyframe after 120 seconds. This keyframe searching is some what time consuming for large video files. If I disregard the keyframe and cut, I face the fact that the video maybe ruined. I have also tried forcing a keyframe but that involves re-encoding. What is the best and most efficient way to extract the first two minutes of a large video file ?

  #fetch nearest keyframe after two minutes
  
  ffprobe -select_streams v -show_frames -v quiet -i test.mp4 | 
  
      awk -F= ' 
  
        /pict_type=/ { if (index($2, "I")) { i=1; } else { i=0; } } 
  
        /pkt_pts_time/ { if (i && ($2 >= 120)) print $2; }  
  
      ' | head -n 1
  
  
  
  #cut video 
  
  ffmpeg -i test.mp4 -ss 00:00:00 -t 00:02:00.15 -async 1 cut.mp4

• web recorded video not played in ipad

  30 juin 2015, par ketan

  I record video from web using flash media server. Now using flex default player i tried to play video but, it will not play ipad.(ios device)
  I checked that video codec and it is something like following :

  libxavs --enable-libxvid --enable-decklink --enable-zlib
  
    libavutil      52. 92.100 / 52. 92.100
  
    libavcodec     55. 69.100 / 55. 69.100
  
    libavformat    55. 45.100 / 55. 45.100
  
    libavdevice    55. 13.102 / 55. 13.102
  
    libavfilter     4. 10.100 /  4. 10.100
  
    libswscale      2.  6.100 /  2.  6.100
  
    libswresample   0. 19.100 /  0. 19.100
  
    libpostproc    52.  3.100 / 52.  3.100
  
  [flv @ 0000000002b60220] Stream discovered after head already parsed
  
  Input #0, flv, from 'C:\Users\Administrator\Desktop\123654789.flv':
  
    Metadata:
  
      canSeekToEnd    : false
  
      createdby       : FMS 4.5
  
      creationdate    : Tue Jun 30 16:27:22 2015
  
    Duration: 00:00:15.25, start: 0.000000, bitrate: 52 kb/s
  
      Stream #0:0: Video: flv1, yuv420p, 320x227, 1k tbr, 1k tbn, 1k tbc
  
      Stream #0:1: Audio: speex, 16000 Hz, mono, s16, 20 kb/s
  
      Stream #0:2: Data: none

  I record video following ways :

  netstream.publish("FILENAME","record");

  Thanks.

  Edit :

  Another flv file i got which is played in ios. But when i check it’s codec it something like following :

  r --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab -
  
  -enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx
  
  --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-
  
  libxavs --enable-libxvid --enable-decklink --enable-zlib
  
    libavutil      52. 92.100 / 52. 92.100
  
    libavcodec     55. 69.100 / 55. 69.100
  
    libavformat    55. 45.100 / 55. 45.100
  
    libavdevice    55. 13.102 / 55. 13.102
  
    libavfilter     4. 10.100 /  4. 10.100
  
    libswscale      2.  6.100 /  2.  6.100
  
    libswresample   0. 19.100 /  0. 19.100
  
    libpostproc    52.  3.100 / 52.  3.100
  
  Input #0, flv, from 'C:\Users\Administrator\Desktop\16402.flv':
  
    Metadata:
  
      major_brand     : 3gp4
  
      minor_version   : 0
  
      compatible_brands: isom3gp4
  
      encoder         : Lavf55.45.100
  
    Duration: 00:00:13.23, start: 0.000000, bitrate: 304 kb/s
  
      Stream #0:0: Video: flv1, yuv420p, 320x240, 300 kb/s, 15 fps, 15 tbr, 1k tbn
  
  , 1k tbc
  
      Stream #0:1: Audio: mp3, 22050 Hz, mono, s16p, 0 kb/s

  How, can i record/convert flv like below ?

• How to limit duration of the video with Dropzonejs ?

  26 juin 2015, par SNaRe

  I have a form which I upload videos and duration/length of the video is important.

  After I upload the file with PHP, I check the duration of the video file size with FFMpeg.

  I calculate duration in PHP and need to send value of the duration via PHP somehow. I think I have to append the duration to $result variable of Json.

  This is my html

      
  
  
  
          <code class="echappe-js">&lt;script src=<br />
  
          &quot;//ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js&quot;&gt;&lt;/script&gt;
          
  &lt;script src=&quot;https://rawgit.com/enyo/dropzone/master/dist/dropzone.js&quot;&gt;&lt;/script&gt;
  &lt;script type=&quot;text/javascript&quot;&gt;<br />
  
  <br />
  
          Dropzone.options.myDropzone = {<br />
  
  <br />
  
          maxFiles: 1,<br />
  
          acceptedFiles: &quot;image/*,video/*&quot;,<br />
  
          maxfilesexceeded: function (file) {<br />
  
              this.removeAllFiles();<br />
  
              this.addFile(file);<br />
  
              $('#infomsg').hide();<br />
  
  <br />
  
          },<br />
  
  <br />
  
          init: function () {<br />
  
              $('#infomsg').hide();<br />
  
  <br />
  
              this.on(&quot;success&quot;, function (result) {<br />
  
  <br />
  
                  $('#infomsg').show();<br />
  
  <br />
  
  <br />
  
                  $(&quot;#boatAddForm&quot;).append($('&lt;input type=&quot;hidden&quot; ' +<br />
  
                      'name=&quot;files[]&quot; ' +<br />
  
                      'value=&quot;' + result.name + '&quot;&gt;'));<br />
  
  <br />
  
              });<br />
  
          }<br />
  
          };<br />
  
  <br />
  
  <br />
  
          &lt;/script&gt;
  
              This is the most minimal example of Dropzone. The upload in this
  
              example doesn’t work, because there is no actual server to handle
  
              the file upload.
  
          
  
              
          
  

  This is my PHP

  <?php
  
  $ds          = DIRECTORY_SEPARATOR;
  
  
  
  $storeFolder = 'uploads';
  
  
  
  if (!empty($_FILES)) {
  
  
  
      $tempFile = $_FILES['file']['tmp_name'];
  
  
  
      $targetPath = dirname( __FILE__ ) . $ds. $storeFolder . $ds;
  
  
  
      $targetFile =  $targetPath. $_FILES['file']['name'];
  
  
  
      move_uploaded_file($tempFile,$targetFile);
  
  
  
  } else {
  
      $result  = array();
  
  
  
      $files = scandir($storeFolder);                 //1
  
      if ( false!==$files ) {
  
          foreach ( $files as $file ) {
  
              if ( '.'!=$file && '..'!=$file) {       //2
  
                  $obj['name'] = $file;
  
                  $obj['size'] = filesize($storeFolder.$ds.$file);
  
                  $result[] = $obj;
  
              }
  
          }
  
      }
  
  
  
      header('Content-type: text/json');              //3
  
      header('Content-type: application/json');
  
      echo json_encode($result);
  
  }

  If I could check a custom json response right after

   Dropzone.options.myDropzone = {

  like other requirements for success, I won’t have to right if statements in success in order to check the validation.

  Basically I want to do it as I do like

   maxFiles: 1,

  without writing any conditions inside success