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• Why the bitrate shown during processing differs so much from the final bitrate after processing using ffmpeg ?

  28 juillet 2016, par rpgmaker

  Using ffmpeg, why the bitrate shown during processing differs so much from the final bitrate after processing ?

  This command on a 1080p source :

  ffmpeg -i "$name" -i "$subname" -map 0 -map 1 -vf scale=-1:720 -c:v libx264 -preset veryslow -crf 21 -c:a aac -b:a 256k -c:s:0 srt -disposition:s:0 default -metadata:s:s:0 language=eng -metadata:s:v:0 title="$title" "$new"

  Shows this output :
  

  Which essentially averages 1300-1400 kBit/s. But when I calculate the bitrate of the resulting video using mkvinfo -t the bitrate shown sits at 970-1000 kBit/s and that’s not even close to averaging the 1300 kBit/s shown throughout processing. What is causing the disparity ?

• Anomalie #4189 (Nouveau) : extraire_multi mélange un /li /ul final avec le de langue ajouté...

  5 octobre 2018, par jluc -

  Quand la langue de la chaîne n’est pas la langue désirée,
  extraire_multi appelle code_echappement qui insère

  au début, ok,
  mais qui colle aussi un

  immédiatement à la fin.

  En général c’est OK, mais pas quand la dernière ligne du texte est le dernier item d’une énumération,
  car alors ce ajouté est pris comme partie prenante de cette dernière ligne par l’appel suivant à propre,
  et le HTML qui sort de ce |propre sera mal emboité car il finira par au lieu de

  Cf #4187

  Dans le cas où le texte se termine par une liste, il faut insérer \n\n pour s’assurer que le /div ajouté par code_echappement reste en dehors de la liste.

  Cf simulation avec https://zone.spip.net/trac/spip-zone/changeset/111853/spip-zone

  Et pour corriger, dans le corps de extraire_multi (https://core.spip.net/projects/spip/repository/entry/spip/ecrire/inc/filtres.php#L1595 ),
  il faut insérer 2 fins de lignes quand ça se termine par /ul,
  entre les 2 lignes suivantes :
  

  <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="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>
  Télécharger

  Ce qui donne :
  

  <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>
  Télécharger

• AWS Lambda for generate thumbnail save empty file

  30 octobre 2019, par Milousel

  I need to create aws lambda for creating thumbnail from video by using ffmpeg, which is saved on S3 and this thumbnail saved into S3 too.

  I downloaded ffmpeg from https://johnvansickle.com/ffmpeg/ page, set ffmpeg into nodejs file and send it into .zip. From this zip file I created ffmpeg layer. After that I connect my lambda with this ffmpeg layer. When I test it I receive Success response, but I save empty file (0 B size) into S3.

  const AWS = require("aws-sdk");
  
  const { spawn } = require("child_process");
  
  const { createReadStream, createWriteStream } = require("fs");
  
  
  
  const s3 = new AWS.S3();
  
  const ffmpegPath = "/opt/nodejs/ffmpeg";
  
  const allowedTypes = ["mov", "mpg", "mpeg", "mp4", "wmv", "avi", "webm"];
  
  const width = process.env.WIDTH;
  
  const height = process.env.HEIGHT;
  
  
  
  module.exports.handler = async (event, context) => {
  
    const srcKey = "test/0255f240-efef-11e9-862e-3949600f0ec9.mp4";
  
    const bucket = "video.devel.abc.com";
  
    const target = s3.getSignedUrl("getObject", {
  
      Bucket: bucket,
  
      Key: srcKey,
  
      Expires: 1000
  
    });
  
    let fileType = "mp4";
  
    console.log("srcKey: " + srcKey);
  
    console.log("bucket: " + bucket);
  
    console.log("target: " + target);
  
    if (!fileType) {
  
      throw new Error(`invalid file type found for key: ${srcKey}`);
  
    }
  
  
  
    if (allowedTypes.indexOf(fileType) === -1) {
  
      throw new Error(`filetype: ${fileType} is not an allowed type`);
  
    }
  
  
  
    function createImage(seek) {
  
      return new Promise((resolve, reject) => {
  
        let tmpFile = createWriteStream(`/tmp/screenshot.jpg`);
  
        const ffmpeg = spawn(ffmpegPath, [
  
          "-ss",
  
          seek,
  
          "-i",
  
          target,
  
          "-vf",
  
          `thumbnail,scale=${width}:${height}`,
  
          "-qscale:v",
  
          "2",
  
          "-frames:v",
  
          "1",
  
          "-f",
  
          "image2",
  
          "-c:v",
  
          "mjpeg",
  
          "pipe:1"
  
        ]);
  
  
  
        ffmpeg.stdout.pipe(tmpFile);
  
        ffmpeg.on("close", function(code) {
  
            console.log('code: ' + code);
  
          tmpFile.end();
  
          resolve();
  
        });
  
  
  
        ffmpeg.on("error", function(err) {
  
          console.log(err);
  
          reject();
  
        });
  
      });
  
    }
  
  
  
    function uploadToS3() {
  
      return new Promise((resolve, reject) => {
  
        let tmpFile = createReadStream(`/tmp/screenshot.jpg`);
  
        let dstKey = srcKey
  
          .replace(/\.\w+$/, `.jpg`)
  
          .replace("test/", "test/shots/");
  
        //const screensFile = "test/shots/";
  
        console.log("dstKey: " + dstKey);
  
        var params = {
  
          Bucket: bucket,
  
          Key: dstKey,
  
          Body: tmpFile,
  
          ContentType: `image/jpg`
  
        };
  
  
  
        s3.upload(params, function(err, data) {
  
          if (err) {
  
            console.log(err);
  
            reject();
  
          }
  
          console.log(`successful upload to ${bucket}/${dstKey}`);
  
          resolve();
  
        });
  
      });
  
    }
  
  
  
    await createImage(1);
  
    await uploadToS3();
  
    return console.log(`processed ${bucket}/${srcKey} successfully`);
  
  };

  When I test it I receive these logs :

• srcKey : test/0255f240-efef-11e9-862e-3949600f0ec9.mp4
• bucket : video.devel.abc.com
• INFO processed video.devel.abc.com successfully
• code : 1
• bucket : video.devel.abc.com
• dstKey : test/shots/0255f240-efef-11e9-862e-3949600f0ec9.jpg
• successful upload to video.devel.abc.com/test/shots/0255f240-efef-11e9-862e-3949600f0ec9.jpg
• processed video.devel.abc.com/test/0255f240-efef-11e9-862e-3949600f0ec9.mp4 successfully

So file is really created, but it is empty (size is 0 B), which is not ideal.