Recherche avancée

Sur d’autres sites (10971)

• How to record a video conference (e.g skype, oovoo, ...) with a program written in C#

  13 août 2014, par Matin Lotfaliee

  I want to record screen (a video conference e.g skype, oovoo, ...) with a program written in C#. I searched a lot about how to do this :

  • Here suggests Windows Media Encoder, but none of their samples work correctly on my Win7. I installed the SDK but even the links to Microsoft are somehow broken or old.
  • Here suggests creating a video stream from a series of screenshots using ffmpeg. but it is probably impossible to keep the audio,mic and screenshots synced.
  • Here suggests creating a GIF file, but it does not support audio which is important to me.
  • Here suggess using Gallio framework, but I was unable to find where the usable DLL for recording is.
  • Here seems to be a great solution but it is not free...

  Compression is not important to me because a video conference uses CPU a lot.

  Can you help me find a good and easy solution with references ?

• FFMPEG / libav : How is UYVY422 written inside AVFrame structure ?

  26 avril 2016, par Sir DrinksCoffeeALot

  I’m trying to copy frame data from AVFrame structure to a buffer. I know how to do that with YUV420P format since Y data is stored inside AVFrame frame->data[0], U data is stored inside AVFrame frame->data[1] and V data is stored inside AVFrame frame->data[2], so it was easy to memcpy() Y,U and V data separately + it’s planar format so i was able to do that with ease :

  for (y = 0; y < height; y++)
  
      {
  
          memcpy(buffer + y*frame->linesize[0], frame->data[0] + y*frame->linesize[0], width);
  
      }
  
  
  
      buffer += ySize;
  
  
  
      for (y = 0; y < height / 2; y++)
  
      {
  
          memcpy(buffer + y*frame->linesize[1], frame->data[1] + y*frame->linesize[1], width / 2);
  
      }
  
  
  
      buffer += uSize;
  
  
  
      for (y = 0; y < height / 2; y++)
  
      {
  
          memcpy(buffer + y*frame->linesize[2], frame->data[2] + y*frame->linesize[2], width / 2);
  
      }

  But when it comes to UYVY422 i have no idea how the data is stored inside the structure. I have general knowledge about UYVY422 format and that it’s written like it name suggests UYVYUYVYUYVY... and so on. But my question is how do i know how much data is stored in AVFrame frame->data[0], AVFrame frame->data[1] and AVFrame frame->data[2] field so i can memcpy() exact amount to the buffer ?

• Pushing file to web-browser while being written

  7 septembre 2013, par Stacked

  I have a backgrounded ffmpeg process which is outputting a audio file, I want to push this file to user web-browser while ffmpeg continues to write upon the file. I tried the below but this send 0 byte files.

  // open the file in a binary mode
  
  $fp = fopen($fname, 'rb');
  
  
  
  // send the right headers
  
  header('Content-Type: application/octet-stream');
  
  header('Content-Disposition: attachment; filename='.basename($fname));
  
  ob_end_clean();
  
  fpassthru($fp);
  
  exit;

  ffmpeg cannot be launched from PHP/Python and output captured here.