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• How to play back a video stream on website ?

  11 juillet 2012, par John Smith

  Lets suppose I have a streaming generated from ffmpeg :

  ffmpeg -f dshow -i video="UScreenCapture" -vcodec libx264 -g 30 -f mpegts tcp://127.0.0.1:1234

  on the server Im catching the stuffes like this :

   error_reporting(E_ALL); /* Allow the script to hang around waiting for connections. */
  
   set_time_limit(30); /* Turn on implicit output flushing so we see what we're getting as it comes in. */
  
   ob_implicit_flush();
  
  
  
   $address = '127.0.0.1';
  
   $port = 1234;
  
   $outfile = dirname(__FILE__)."/output.flv";
  
   $ofp = fopen($outfile, 'wb');
  
  
  
   if (($sock = socket_create(AF_INET, SOCK_STREAM, SOL_TCP)) === false) { echo "socket_create() failed: reason: " . socket_strerror(socket_last_error()) . "\n"; sleep (5); die; }
  
   if (socket_bind($sock, $address, $port) === false) { echo "socket_bind() failed: reason: " . socket_strerror(socket_last_error($sock)) . "\n"; sleep (5); die; }
  
   if (socket_listen($sock, 5) === false) { echo "socket_listen() failed: reason: " . socket_strerror(socket_last_error($sock)) . "\n"; sleep (5); die; }
  
   if (($msgsock = socket_accept($sock)) === false) { echo "socket_accept() failed: reason: " . socket_strerror(socket_last_error($sock)) . "\n"; sleep (5); break; }
  
   do {
  
      $a = '';
  
      socket_recv ($msgsock, $a, 65536, MSG_WAITALL);
  
      fwrite ($ofp, $a);
  
      fclose ($ofp);
  
      $ofp = fopen($outfile, 'ab');
  
      //echo strlen($a)."\r\n";
  
   } while (true);

  now Im stuck replaying this. VCL player can replay this so its got to be good, but how to put it onto a site ? I know theres HTML5 video tags, but lets not use it, because it might unsupported, and I also failed make it work every way. Is there a flash solution ? Its a dymanic stream, so no start-end !

• Swift : How can I generate Mp4 video from programmaticall output ? [closed]

  21 août 2020, par Mount Ain

  This question is specifically to Swift programming language for Linux & macOS platforms.To understanding the concept, I used Swift programming language. But not depend on Swift programming language. C or C++ is also good to me.

  


  I can generate JPEG image from NSView by using NSBitmapImageRep. But Linux I don't what I want to do. So, the first thing I need to know is the step to generate JPEG image by programmatically without using the NSView. I really don't know How hard it is. But I want to learn how it's work. I feel It's the way to fill the color into pixels one by one to combine a Image. But I don't know How to do in programming. I knew the same way is used in videos by packing the series of image with audio & subtitle & other meta info.

  


  If you ask about compression, I really want to know How Twitter & YouTube compressing uploaded videos without loss of quality.

  


  So what is the concept,

  


  

  1. To generate a JPEG image by programmatically without using NSView ?

  


  2. To generate MPEG-4 video by group of JPEG images ?

  


  


  Thanking in advance...

  


• How to generate gif from avi using ffmpeg ?

  19 décembre 2012, par Marconi

  I'm trying to extract a part of a video into an animated gif using the following command :

  ffmpeg -i video.avi -t 5 out.gif

  It generates an animated gif but the quality is insane. However when I generate gif image using :

  ffmpeg -i video.avi -t 10 out%d.gif

  It generates acceptable quality of gif images. How can i generate animated gif using the first command but the same quality as the second command ?