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• avfilter/scale* : add option reset_sar

  31 janvier, par Gyan Doshi

  avfilter/scale* : add option reset_sar
  For anamorphic videos, enabling this option leads to adjustment of
  
  output dimensions to obtain square pixels when the user requests
  
  proportional scaling through either of the w/h expressions or
  
  force_original_aspect_ratio.
  Output SAR is always reset to 1.
  Option added to scale, scale_cuda, scale_npp & scale_vaapi.
  libplacebo already has a similar option with different semantics,
  
  scale_vt and scale_vulkan don't implement force_oar, so for these
  
  three filters, I've made minimal changes needed to not break building
  
  or change output.
  

  • [DH] doc/filters.texi
  • [DH] libavfilter/scale_eval.c
  • [DH] libavfilter/scale_eval.h
  • [DH] libavfilter/vf_libplacebo.c
  • [DH] libavfilter/vf_scale.c
  • [DH] libavfilter/vf_scale_cuda.c
  • [DH] libavfilter/vf_scale_npp.c
  • [DH] libavfilter/vf_scale_vaapi.c
  • [DH] libavfilter/vf_scale_vt.c
  • [DH] libavfilter/vf_scale_vulkan.c

• lavu/tx : implement 32 bit fixed point FFT and MDCT

  9 février 2020, par Lynne

  lavu/tx : implement 32 bit fixed point FFT and MDCT
  Required minimal changes to the code so made sense to implement.
  
  FFT and MDCT tested, the output of both was properly rounded.
  
  Fun fact : the non-power-of-two fixed-point FFT and MDCT are the fastest ever
  
  non-power-of-two fixed-point FFT and MDCT written.
  
  This can replace the power of two integer MDCTs in aac and ac3 if the
  
  MIPS optimizations are ported across.
  
  Unfortunately the ac3 encoder uses a 16-bit fixed point forward transform,
  
  unlike the encoder which uses a 32bit inverse transform, so some modifications
  
  might be required there.
  The 3-point FFT is somewhat less accurate than it otherwise could be,
  
  having minor rounding errors with bigger transforms. However, this
  
  could be improved later, and the way its currently written is the way one
  
  would write assembly for it.
  
  Similar rounding errors can also be found throughout the power of two FFTs
  
  as well, though those are more difficult to correct.
  
  Despite this, the integer transforms are more than accurate enough.
  

  • [DH] doc/APIchanges
  • [DH] libavutil/Makefile
  • [DH] libavutil/tx.c
  • [DH] libavutil/tx.h
  • [DH] libavutil/tx_int32.c
  • [DH] libavutil/tx_priv.h
  • [DH] libavutil/tx_template.c
  • [DH] libavutil/version.h

• 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