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• How to impose PNG stream over exist video using ffmpeg and image2pipe ?

  16 avril 2019, par Михаил Магомедов

  I reproduce the steps of this article with nodeJs :

  https://blog.scwu.io/rendering-canvas-to-mp4-using-nodejs/

  I not need to generate a new video from the stream of png pictures, me need impose png stream over exist video, please tell me how to do it ?

  var recorder = spawn("ffmpeg", [
  
      "-y", "-f", "image2pipe",
  
      "-vcodec", "png", "-r", "60",
  
      "-i", "-", "-vcodec", "h264",
  
      "-r", "60", "output.mp4"
  
  ]);
  
  
  
  for(var i = 0; i<100; i++){
  
      ...some ctx processing
  
      let url = canvas.toDataURL(),
  
          data = atob( url.substring(url.indexOf("base64") + 7) );
  
  
  
      recorder.stdin.write(data, "binary");
  
  }
  
  
  
  recorder.stdin.end();

• Real time stereo video stream. How to start

  29 juin 2015, par victor jung

  Here is my problem :

  I have at one side two webcams plugged in a linux computer, and on the other side, an android smartphone. My goal is to program a real time stream of the 2 webcams, and display that stream on the smartphone (to be used in a google cardboard mask). I read quite a lot on the subject, and I found several way to achieve this.

  First there is ffmpeg, which could encode and stream.

  But I need to modify the pictures at some point, to re-size them / or to ad some kind of distortion. So I thought it would be great if I can get the 2 images, with openCv maybe, playwith them, build a new one, and stream them, but how could ffmpeg deal with the newly created image ?

  The other option would be to get the 2 pics and play with them with openCv too, but then, hardcode a stream over, UDP in RTP style, but wouldnt be hard to display the stream nicely on the phone ?, and how to cut the image to fit in small packets ?

  Thanks for your help, I am still digging in the subject, so if you have any other way to do it I am taking !

  ps : My introducing Hello, won’t stay at the beginning of my message...
  Have a nice day every body.
  d-4 before frieday.

• alsdec : check sample pointer range in revert_channel_correlation

  21 avril 2015, par Andreas Cadhalpun

  alsdec : check sample pointer range in revert_channel_correlation
  Also change the type of begin, end and smp to ptrdiff_t to make the
  
  comparison well-defined.
  Signed-off-by : Andreas Cadhalpun <Andreas.Cadhalpun@googlemail.com>
  
  Reviewed-by : Thilo Borgmann <thilo.borgmann@mail.de>
  
  Signed-off-by : Michael Niedermayer <michaelni@gmx.at>
  

  • [DH] libavcodec/alsdec.c