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• Documentation #2094 : Déclarer ses objets éditoriaux - pipeline declarer_tables_objets_sql

  17 août 2011, par Eric Lupinacci

  Il existe aussi un fichier Google partagé que j’ai écrit avec Denisb et que Cédric a relu et corrigé : https://spreadsheets.google.com/spreadsheet/ccc?key=0Aq-LDsZ2YhzydDBvMjRSamQ5aWtfNWpKcnFESjQwU3c&hl=fr&authkey=CMmWhpEC

• FFMPEG - Instructional video combining letters to a background to form a word

  6 juin 2020, par Knide

  I'm trying to help with coding a FREE site for instructional video for kids on how to write in australian. To help with the current pandemic that we are experiencing right now.

  



  Anyway, I'm new to ffmpeg and would like to do the letter combinations programatically using it.

  



  So basically I have a form where teachers or parents can enter a word, and I have video instructions for each letter, and would combine them to form the word.

  



  Example : Dog

  



  This is the background :
https://drive.google.com/file/d/1Ds1sRKQ98c5d31dI6qkqTrp1U9f89nv2/view?usp=sharing

  



  These are the letters :

  



  D - https://drive.google.com/file/d/1DHa1sZ7mklY1p3lquD8h5kTbXaZmtB_z/view?usp=sharing

  



  o - https://drive.google.com/file/d/1Ytwq_3l7x0vRDMEpZpmFjT9QNICYWH_D/view?usp=sharing

  



  g - https://drive.google.com/file/d/16jcOsrSbMSbsk2vsqeMXv9Cc4Uss7qtj/view?usp=sharing

  



  And the output would become :
https://drive.google.com/file/d/1RT38IOwXsL9kW9mj41KrxwfI_kdZy45j/view?usp=sharing

  



  If you could help with supplying what ffmpeg code we could use to have the output video, that would be great.

  


• How to reduce the size of video file as a buffer or blob before writing it on Nodejs ?

  7 novembre 2022, par Hypothesis

  I send live feed from client to the server using websocket from the client side like this :

  


      recorder = new MediaRecorder(canvasStream, {
        mimeType: 'video/webm;codecs=vp9',
        videoBitsPerSecond: 3 * 1024 * 1024
    });
    recorder.ondataavailable = async (e) => {
        const arbuf = await e.data.arrayBuffer()
        ws.send(pack({ type: 'REC', data: arbuf })) //sends to server
    }


  


  and on the server side I get them like this :

  


   let blob = new Blob(chunks, { type: 'video/mp4' })
      const buffer = Buffer.from(await blob.arrayBuffer());
      fs.writeFile("foo.mp4", buffer, () => console.log('video saved!'));


  


  However foo.mp4 is really large. Please help me find a way to reduce the size of foo.mp4 as it is being written down to the disc. ( I can reduce it after it is written, however that won't do the trick for me. It has to be encoded and compressed before it is written )