Recherche avancée

Sur d’autres sites (10085)

• Passing stream of getUserMedia output to ffmpeg,How would i do that ?

  29 décembre 2016, par A Sahra

  I am using getUserMedia to get access to camera.while playing the captured video with getUserMedia i want to stream and broadcast it to all user in my page as Live stream using ffmpeg and ffserver,

  How would i post that stream to server(ffserver) for streaming it Live ?

  Here is the code for getUserMedia part

  window.addEventListener('DOMContentLoaded', function() { 
  
  var v = document.getElementById('vlive'); 
  
  navigator.getUserMedia = (navigator.getUserMedia || navigator.webkitGetUserMedia || navigator.mozGetUserMedia || navigator.msGetUserMedia); 
  
  if (navigator.getUserMedia) 
  
  { 
  
  navigator.getUserMedia( { video:true, audio:true, }, 
  
  function(stream) { 
  
  var url = window.URL || window.webkitURL; 
  
  v.src = url ? url.createObjectURL(stream) : stream; 
  
  v.play(); 
  
  },   
  
  function(error) { console.log('Good Job'); 
  
  alert('Something went wrong. (error code ' + error.code + ')'); 
  
  return;
  
  }); 
  
  }
  
  else { 
  
  alert('Sorry, the browser you are using doesn\'t support getUserMedia'); 
  
  return; 
  
  } });

• FFMPEG spoils the extreme pixels when converting and cropping images [closed]

  20 décembre 2024, par Jacob

  I have a side image processing task in my work.
I am using the following command to translate a spherical panorama into a cubemap :

  


  Path/ffmpeg.exe -i "Path/PanoImageInput.png" -vf v360=equirect:c6x1:fin_pad=64:out_frot=002200,scale=-1:2048:flags=neighbor "Path/CubemapOutput.png"

  


  And then I slice it into separate images, 1 face for example :

  


  Path/ffmpeg.exe -i "Path/CubemapOutput.png" -vf crop=2048:2048:0:0 -sws_flags neighbor "Path/face_1.png"

  


  I get artifacts on both cubemap and images of this kind that really bother me :

  


  Cubemap image junction
The junction and part of the edge of the cubemap image

  


  The pixels at the junctions of the 6 images in cubemap and the outermost pixels of any images change their color slightly. This eventually leads to the appearance of visible seams in the scene assembled from the images.

  


  Is there any way I can get rid of them ?

  


  I have tried different interpolation methods in both functions : fast, bicubric, gauss, etc. It doesn't seem to have any effect.

  


  I also tried to crop a couple of pixels less, something like : crop=2040:2040:4:4

  


  I thought it was all because of cubemap and its distortions. Anyway, at the edges of the image, the extreme pixels change their hue.

  


  I also hoped that with the help of pad, during the conversion, I could somehow control the area where the pixels deteriorate, but it absolutely does not matter what I put there - fin_pad, fout_pad and any numbers for them, remove scale, set scale - neither the final image size changes, nor any extra fields appear. Most likely, I just don't understand what this function is really supposed to mean.

  


• Want to convert my 16:9 size MKV video to 4:3 size AVI video file

  19 septembre 2012, par Bimal Rekhadiya

  I have a video in MKV format and it's size is 720x304 (16:9 ratio) size video.

  I want to convert it to AVi format (using xvid video codec). The output file size should be 480x360 (4:3 ratio) and also want to keep the original (16:9) ratio so it should be cinemascope (black areas at top and bottom).

  I am on Ubuntu linux OS so I can use mencoder, avconv(ffmpeg) or any tool that work on Linux.

  I am trying this command :

  avconv -i sample.mkv -vcodec libxvid -r 25 -b 1200 -aspect 4:3 -q 1 t.avi

  But the problem is that the video is stretched to 4:3 and I want to keep original video's ratio and want to add black boxes at top and bottom so it will look cinemascope.

  Please provide me command to do this.