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• Commit fix to Moz Bugzilla #719612 (along with spec update in previous commit)

  20 janvier 2012, par Monty

  Commit fix to Moz Bugzilla #719612 (along with spec update in previous commit)
  git-svn-id : http://svn.xiph.org/trunk/vorbis@18151 0101bb08-14d6-0310-b084-bc0e0c8e3800
  

  • [DH] configure.ac
  • [DH] lib/floor1.c
  • [DH] lib/info.c

• crossorigin header in php is not working after previous php exec ffmpeg command

  17 avril 2022, par ivyyeziyang

  I am using php exec function to execute a FFMPEG command, but I am also using Javascript to send the request and they are cross origin requests, but after the exec command, while I start to send next cross origin request, it shows
Access to XMLHttpRequest at 'https://www..com:550/api/adminapi' from origin 'https://www..com:8081' has been blocked by CORS policy : No 'Access-Control-Allow-Origin' header is present on the requested resource.
which means the cross origin header is not working in the next cross origin request after exec command,
below is the code :

  


  if (isset($_POST['crossorigin'])) {
$crossoriginallow = array();
$crossoriginallow = [
'https://www.***.com:8080', 
'https://www.***.com:8081', 
'https://www.***.com:8082'];
for ($i = 0; $i < sizeof($crossoriginallow); $i++) {
if ($crossoriginallow[$i] == $_POST['crossorigin']) {
  $crossorigin = $_POST['crossorigin'];
  break;
  }
}
header("Access-Control-Allow-Origin:$crossorigin");
header("Access-Control-Allow-Methods:GET, POST, OPTIONS, DELETE");
header("Access-Control-Allow-Headers:DNT,X-Mx-ReqToken,Keep- 
Alive,User-Agent,X-Requested-With,If-Modified-Since,Cache- 
Control,Content-Type, Accept-Language, Origin, Accept-Encoding");
}

exec("ffmpeg -i " . $infilepath . " -c:v mpeg4 -preset veryslow - 
 c:a mp3 -q 0 " . $outfilepath /* . " 2>&1" *//* , $out */);

 $infilepathsep = explode('/', $infilepath);
 $folderpath = '';
 for ($i = 0; $i < sizeof($infilepathsep) - 1; $i++) {
 $folderpath = $folderpath . $infilepathsep[$i];
 $folderpath = $folderpath . '/';
}

 $opendirhandle = opendir($folderpath);
 closedir($opendirhandle);
 $openfilehandle = fopen($infilepath, 'r');
 fclose($openfilehandle);
 unlink(iconv("utf-8", "gbk", $infilepath));
 $result['data'] = $outfilepath;
 $result['msg'] = 'success';
 $jsonresult = json_encode($result);
 echo $jsonresult;
 ob_get_contents();
 ob_end_flush();


  


  I does not encounter this problem before using the same code,but after I reinstall the computer it happens, May I please ask the reason if you know the problem ? Thank you very much for your help !

  


• ffmpeg : Is there a way to decode a video frame, given the previous frame, motion vectors, and a residual image ?

  20 décembre 2018, par aarzchan

  Assume we are given the following numpy arrays : the BGR video frame for timestep t-1, the motion vectors for timestep t, and the residual image for timestep t. Also, assume the video frame, motion vectors, and residual iamge, come from a video which was compressed using mpeg-4.

  Using these inputs, how would we use ffmpeg to decode the BGR video frame for timestep t ?

  I tried manually reconstructing the t frame by : (1) creating a reference frame, which is just a copy of the t-1 frame ; (2) performing motion compensation by copying 16x16 pixel blocks from the t-1 frame to the reference frame, based on the motion vectors ; (3) adding the residual image to the motion-compensated reference frame.

  However, the resulting predicted t frame doesn’t exactly match the actual t frame, so I feel that this might not be the right way to do it.