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• How can I get the final size after transcripting a video to stream it with fluent-ffmpeg ?

  5 avril 2018, par G. Manukyan

  I am trying to stream a video using createReadStream and using pipe(res) in node.js and it works fine if the file doesn’t need transcoding (mp4, webm).

  With mkv files I am using fluent-ffmpeg to transcode it on the fly, but the problem is that I can’t go back and forward in the html video player.

  download = function(file, req, res) {   
  
  
  
      const range = req.headers.range
  
      const parts = range.replace(/bytes=/, "").split("-")
  
  
  
      const start = parseInt(parts[0], 10);
  
      const end = parts[1] ? parseInt(parts[1], 10) : file.length - 1
  
  
  
      res.setHeader('Content-Type', 'video/webm')
  
      res.setHeader('Accept-Ranges', 'bytes');
  
      res.setHeader('Content-Length', 1 + end - start);
  
      res.setHeader('Content-Range', `bytes ${start}-${end}/${file.length}`);
  
      res.statusCode = 206;
  
  
  
      var stream = file.createReadStream({start, end})
  
  
  
      ffmpeg(stream)
  
      .videoCodec('libvpx')
  
      .audioCodec('libvorbis')
  
      .videoBitrate('512k')
  
      .format('webm')
  
      .on('start', () => {
  
          console.log('transcoding...')
  
      })
  
      .on('error', (err, stdout, stderr) => {
  
          console.log(err.message, err, stderr);
  
      })
  
      .on('progress', function(progress) {
  
          console.log(progress);
  
      })
  
      .on('end', function(filenames) {
  
          console.log("Finished transcoding.");           
  
      })
  
      .pipe(res);
  
  
  
  }

  I think that comes from the fact that we don’t know in advance the size of the final transcoded file so the range we send in the headers is wrong and somehow make the video player "limited".

  What can be a workaround to this problem ?

• lavfi/nlmeans : move final weighted averaging out of nlmeans_plane

  6 mai 2018, par Clément Bœsch

  lavfi/nlmeans : move final weighted averaging out of nlmeans_plane
  This helps figuring out where the filter is slow :
    70.53%  ffmpeg_g  ffmpeg_g          [.] nlmeans_slice
  
    25.73%  ffmpeg_g  ffmpeg_g          [.] compute_safe_ssd_integral_image_c
  
     1.74%  ffmpeg_g  ffmpeg_g          [.] compute_unsafe_ssd_integral_image
  
     0.82%  ffmpeg_g  ffmpeg_g          [.] ff_mjpeg_decode_sos
  
     0.51%  ffmpeg_g  [unknown]         [k] 0xffffffff91800a80
  
     0.24%  ffmpeg_g  ffmpeg_g          [.] weight_averages
  (Tested with a large image that takes several seconds to process)
  Since this function is irrelevant speed wise, the file's TODO is
  
  updated.
  

  • [DH] libavfilter/vf_nlmeans.c

• Anomalie #4189 : extraire_multi mélange un /li /ul final avec le de langue ajouté par code_...

  5 octobre 2018, par jluc -

  Plutôt
  

  <span class="CodeRay"><span class="local-variable">$mode</span> = <span class="predefined">preg_match</span>(<span class="string"><span class="delimiter">'</span><span class="content">,span><span class="delimiter">'</span></span> . _BALISES_BLOCS . <span class="string"><span class="delimiter">'</span><span class="content">)[>[:space:]],iS</span><span class="delimiter">'</span></span>, <span class="local-variable">$trad_propre</span>) ? <span class="string"><span class="delimiter">'</span><span class="content">div</span><span class="delimiter">'</span></span> : <span class="string"><span class="delimiter">'</span><span class="content">span</span><span class="delimiter">'</span></span>;
  <span class="keyword">if</span> (<span class="local-variable">$mode</span>==<span class="string"><span class="delimiter">'</span><span class="content">div</span><span class="delimiter">'</span></span> <span class="keyword">and</span> (<span class="predefined">substr</span>(<span class="predefined">rtrim</span>(<span class="local-variable">$trad_propre</span>), -<span class="integer">5</span>)==<span class="string"><span class="delimiter">'</span><span class="content"></span><span class="delimiter">'</span></span>))
      <span class="local-variable">$trad</span> .= <span class="string"><span class="delimiter">"</span><span class="char">\n</span><span class="char">\n</span><span class="delimiter">"</span></span>;
  <span class="local-variable">$trad</span> = code_echappement(<span class="local-variable">$trad</span>, <span class="string"><span class="delimiter">'</span><span class="content">multi</span><span class="delimiter">'</span></span>, <span class="predefined-constant">false</span>, <span class="local-variable">$mode</span>);
  </span></span>
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