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• ValueError : Encountered hstack() with multiple outgoing edges with same upstream label None ; a `split` filter is probably required

  30 juillet 2021, par kup

  I want to stack multiple videos at a time at the screen "more or less like zoom show multiple screens of users" but unable to do so and met with an error :

  


  The approach i took :

  


  aout = /*got audio*/
vout0 = ffmpeg.filter( [v1, v2], 'hstack')
vout1 = ffmpeg.filter( [v3, v4], 'hstack')

vout = ffmpeg.filter([vout0.video, vout1.video], 'vstack')

(
    ffmpeg
    .output(aout, vout, "out.mkv")
    .run()
)



  


  


  ValueError : Encountered hstack() <1a9d597431a8> with multiple outgoing edges with same upstream label None ; a split filter is probably required

  &#xA;

  &#xA;

  I don't know if it is the right approach or not.

  &#xA;

  I tried using split but it didn't worked either.

  &#xA;

• Can I use ffmpeg to change 360 video projection ?

  29 janvier 2016, par Guig

  I want to convert 360 videos from equirectangular to cubic projection. Does ffmpeg supports that ? Else, what’s the best approach ?

• Encoding in MP3 in ReactJS

  18 décembre 2018, par Kramer

  I am trying to encode my sample data to either mp3 directly or wav to mp3

  I have written wav conversion code below :

   function encodeWAV(samples) {
  
                  console.log("sample rate in encoded wav:"+sampleRate);
  
                  let buffer = new ArrayBuffer(44 + samples.length * 2);
  
                  let view = new DataView(buffer);
  
  
  
                  /* RIFF identifier */
  
                  writeString(view, 0, 'RIFF');
  
                  /* RIFF chunk length */
  
                  view.setUint32(4, 36 + samples.length * 2, true);
  
                  /* RIFF type */
  
                  writeString(view, 8, 'WAVE');
  
                  /* format chunk identifier */
  
                  writeString(view, 12, 'fmt ');
  
                  /* format chunk length */
  
                  view.setUint32(16, 16, true);
  
                  /* sample format (raw) */
  
                  view.setUint16(20, 1, true);
  
                  /* channel count */
  
                  view.setUint16(22, numChannels, true);
  
                  /* sample rate */
  
                  view.setUint32(24, 16000, true);
  
                  /* byte rate (sample rate * block align) */
  
                  view.setUint32(28, 16000 * 4, true);
  
                  /* block align (channel count * bytes per sample) */
  
                  view.setUint16(32, numChannels * 2, true);
  
                  /* bits per sample */
  
                  view.setUint16(34, 16, true);
  
                  /* data chunk identifier */
  
                  writeString(view, 36, 'data');
  
                  /* data chunk length */
  
                  view.setUint32(40, samples.length * 2, true);
  
  
  
                  floatTo16BitPCM(view, 44, samples);
  
  
  
                  return view;
  
              }
  
          }, self);

  Though I have tried to look couple of more option for e.g -libmp3lame.js and ffmpeg but I don’t get to know how do I import these scripts to my ReactJS application because components are made in JSX if there is no class in these files how do we use it. We can’t use these scripts in index.html because then the recorder object mentioned in a component cannot be understandable I hear from people saying there is no difference in JavaScript and ReactJS and it makes me laugh really though I know eventually these code will get transpiled to JavaScript which browser can understand but I can’t expect to write JavaScript with no class just ready function and no export and magically expecting to work.