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Failed to convert web-saved .wemb audio to .wav by using php "shell_exec" and javascript
30 mai 2022, par AnirbasgnawI'm working on an online experimenter which could record participants' audio from the browser. The audio data I get has an extension of .wemb, so I plan to use ffmpeg to convert it to .wav while I save the data.


I tried to use PHP's
shell_exec
but nothing happens when I run the scripts. Then I found that myecho
andprint_r
also did not work. I'm new to PHP and javascript, so I''m really confused now.

Below are the relevant codes, I really appreciate it if you could help !


write_data.php
:

<?php
 $post_data = json_decode(file_get_contents('php://input'), true); 
 // the directory "data" must be writable by the server
 $name = "../".$post_data['filename'];
 $data = $post_data['filedata'];
 // write the file to disk
 file_put_contents($name, $data);
 
 $INPUT = trim($name) . ".webm";
 $OUTPUT = trim($name) . ".wav";
 echo "start converting...";

 // check if ffmprg is available
 $ffmpeg = trim(shell_exec('which ffmpeg'));
 print_r($ffmpeg);
 // call ffmpeg
 shell_exec("ffmpeg -i '$INPUT' -ac 1 -f wav '$OUTPUT' 2>&1 ");
?>



javascript
:

saveData: function(fileName,format){
 // save as json by default
 if (!format){ format = 'json';}
 // add extension to filename
 fileName = `${fileName}.${format}`
 // create saveData object using fetch
 let saveData = [];
 if (format == 'json') {
 saveData = {
 type: 'call-function',
 async: true,
 func: async function(done) {
 let data = jsPsych.data.get().json();
 const response = await fetch("../write_data.php", {
 method: "POST",
 headers: {
 "content-type": "application/json"
 },
 body: JSON.stringify({ filename: fileName, filedata: data })
 });
 if (response.ok) {
 const responseBody = await response.text();
 done(responseBody);
 }
 }
 }
 } else {
 saveData = {
 type: 'call-function',
 async: true,
 func: async function(done) {
 let data = jsPsych.data.get().csv();
 const response = await fetch("../write_data.php", {
 method: "POST",
 headers: {
 "content-type": "application/json"
 },
 body: JSON.stringify({ filename: fileName, filedata: data })
 });
 if (response.ok) {
 const responseBody = await response.text();
 done(responseBody);
 }
 }
 }
 }
 return saveData;
 },