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• DirectShow Encryption and Decryption Filters incorrect path leading to wrong decoding ?

  11 mai 2016, par Michael Chi Lam

  Situation : I’m creating two DirectShow Filters cryptography. I’ve written them as In place transformations however it’s not working as planned, I believe it has something to do my encoding and decoding paths. My source is an AVI and my output a encrypted MP4. (Encryption Filter) for my decryption filter I take in a mp4 and render the video. However when I attempt to render the video, the play back is a black screen.

  AVI to MP4 on GraphStudioNext :
  

  MP4 to Video Renderer :
  

  Both of them works, however when I insert my Cryptography(This is the encryption, I got lazy and didn’t rename it properly) and Decryption filter respectively it doesn’t work

  I placed my Encrypt and Decrypt side by side (See below) and it generates an mp4 that I can play back.
  

  Question : Is there a filter I am missing on the decoding path ? (Mp4 to Render)

• avformat/mpc8 : fix hang with fuzzed file

  3 février 2015, par wm4

  avformat/mpc8 : fix hang with fuzzed file
  This can lead to an endless loop by seeking back a few bytes after each
  
  attempted chunk read. Assuming negative sizes are always invalid, this
  
  is easy to fix. Other code in this demuxer treats negative sizes as
  
  invalid as well.
  Fixes ticket #4262.
  Signed-off-by : Michael Niedermayer <michaelni@gmx.at>
  

  • [DH] libavformat/mpc8.c

• 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 !