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• 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 !

  


• Convert WebM/H.264 to MP4/H.264 efficiently with ffmpeg.js

  31 juillet 2017, par SB2055

  As a result of the answer here : Recording cross-platform (H.264 ?) videos using WebRTC MediaRecorder

  How can one go about using ffmpeg.js to efficiently unwrap a webm h.264 video and re-wrap it into an mp4 container ?

  I’m looking through the docs : https://github.com/Kagami/ffmpeg.js?files=1

  However I don’t see (or perhaps I’m looking for the wrong terminology) any examples for the above. This operation will be performed on the browser (chrome) prior to uploading as a Blob - I could use a web worker though hopefully rewrapping is a trivial enough operation to not require it.

• For lossless video compression, which is better ? crf or qp ?

  19 avril 2020, par Nagabhushan S N

  I have a raw video. I need it to compress it losslessly. There are two ways to do this. Setting the parameters crf or qp to 0. crf achieves constant bitrate while qp has constant quantization. I've two questions :

  



  

  1. Do the options -crf 0 and -qp 0 achieve the same result (lossless compression) ?

  


  2. If not, what is the difference ? Which is recommended to have lossless compression ?

  


  



  This question asks about crf and qp, but doesn't talk about lossless compression.