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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

• In ffmpeg : Can't get peak bitrate values within 10% error tolerance for HLS playlist files

  5 octobre 2019, par ALS20394

  I’m using ffmpeg to produce several HLS variant playlists from an .mp4 file. When I check master.m3u8 file with mediastreamvalidator I get :

  Error : Measured peak bitrate compared to master playlist declared value exceeds error tolerance

  I understand that the error percentage needs to be less than 10%, and figured it out on 1 variant but not the three others. I’ve spent quite a bit of time adjusting the -maxrate and the -buffsize but the error percentage change is minimal. Beginning to wonder if I’m misunderstanding something ?

  This is the latest of what I enter :

  ffmpeg -i FHVid.mp4 \
  
  -b:v:0 5000k -maxrate 5250k -bufsize 5500k -profile:v main -c:v h264 -crf 20 -sc_threshold 0 -g 48 \
  
  -b:v:1 2800k -maxrate 2940k -bufsize 3100k -profile:v main -c:v h264 -crf 20 -sc_threshold 0 -g 48 \
  
  -b:v:2 1400k -maxrate 1540k -bufsize 1700k -profile:v main -c:v h264 -crf 20 -sc_threshold 0 -g 48 \
  
  -b:v:3 800k -maxrate 840k -bufsize 1050k -profile:v main -c:v h264 -crf 20 -sc_threshold 0 -g 48 \
  
  -b:a:0 192k \
  
  -b:a:1 128k \
  
  -b:a:2 128k \
  
  -b:a:3 96k \
  
  -c:a aac -ar 48000 -keyint_min 48 -map 0:v -map 0:a -map 0:v -map 0:a -map 0:v -map 0:a -map 0:v -map 0:a \
  
  -f hls -var_stream_map "v:0,a:0  v:1,a:1 v:2,a:2 v:3,a:3" \
  
  -master_pl_name FHVidmaster.m3u8 -hls_time 4 -hls_playlist_type vod \
  
  -hls_segment_filename 'file_%v_%03d.ts' out_%v.m3u8

  but I’ve also tried max rates that seem to be more standard

  -b:v:0 5000k -maxrate 5500k -bufsize 6500k
  
  -b:v:1 2800k -maxrate 3080k -bufsize 3200k
  
  -b:v:2 1400k -maxrate 1540k -bufsize 1900k
  
  -b:v:3 800k -maxrate 880k -bufsize 1050k

  The latest error message :

  Error: Measured peak bitrate compared to master playlist declared value exceeds error tolerance
  
  --> Detail:  Measured: 1111.54 kb/s, Master playlist: 1680.80 kb/s, Error: 33.87%
  
  --> Source:  /Users/Bun/Documents/CODING/CosmicPerspectiveAssets/01-FalconHeavy/HLS/FHVidmaster.m3u8
  
  --> Compare: out_2.m3u8
  
  
  
  --> Detail:  Measured: 1178.21 kb/s, Master playlist: 5711.20 kb/s, Error: 79.37%
  
  --> Source:  /Users/Bun/Documents/CODING/CosmicPerspectiveAssets/01-FalconHeavy/HLS/FHVidmaster.m3u8
  
  --> Compare: out_0.m3u8
  
  
  
  --> Detail:  Measured: 1109.03 kb/s, Master playlist: 3220.80 kb/s, Error: 65.57%
  
  --> Source:  /Users/Bun/Documents/CODING/CosmicPerspectiveAssets/01-FalconHeavy/HLS/FHVidmaster.m3u8
  
  --> Compare: out_1.m3u8

  Any help would be greatly appreciated on the -maxrate and -buffsize for variant playlists 0, 1, and 2. No adjustment I make seems to make any difference.

• 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