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• What does "Error in the pull function" mean while executing ffmpeg command ?

  8 avril 2022, par Alex Rypun

  I'm trying to generate a video from multiple video sources (https urls).

  


  If I use say 8 video sources it works as expected. But if I need say 30 sources, it starts to work as expected, but at some moment a lot of errors appear.

  


  

  


  I believe the main one is Error in the pull function..

  


  Such a video-source appears in the output file but not a full requested part (e.g., I set trim=0:5, but ffmpeg generates only 3 seconds).

  


  I tried different videos, different cropped parts, loaded sources to aws s3, but can't identify a "bad case", it's reproduced with different options.

  


  My command looks like this :

  


  ffmpeg -y
-i "https://player.vimeo.com/external/399541658.hd.mp4?s=5432956383527af00bb74b41c120bbb84ff3ac5e&profile_id=175&oauth2_token_id=57447761"
...
-i "https://player.vimeo.com/external/464966383.hd.mp4?s=648aa8277259c499f1d05d6330f9922932c080a6&profile_id=175&oauth2_token_id=57447761"
-i "https://test.com/development/videos/dc3c32cf9a194db1bb52/sources/5q5e3j2h57.mp3"
-filter_complex "[0:v]trim=0:5.64,setpts=PTS-STARTPTS,scale=1920x1080,setdar=16/9[v0];[1:v]trim=0:8,setpts=PTS-STARTPTS,scale=1920x1080,setdar=16/9,loop=0:32767[v1]; ... [10:v]trim=0:13,setpts=PTS-STARTPTS,scale=1920x1080,setdar=16/9[v10];[v0] ... [v10] concat=n=11:v=1 [video];[11:a] atrim=0:99.29 [audio]"
-vsync 2 -map [video] -map [audio] output.mp4


  


  When I downloaded all sources to my local machine and tried to use them in the ffmpeg command it worked fine without errors.

  


  Also, I figured out that it depends on the CPU. When I restricted my CPU the errors appeared earlier. And some commands might produce errors with a restricted CPU but finished successfully with no CPU restriction.

  


  As I understand, for some reason, ffmpeg fails to receive a particular part of a file data, but I believe it should retry to receive lost packages (it's https).

  


  And I don't understand, how it could be related to CPU or sources quantity.

  


  By not understanding the core of evil, I can think about 2 ways (both ugly) :

  


  

  1. to download all sources and generate the final video from local files ;

  


  2. to chunk sources, generate intermediate outputs for each chunk (and save locally), and concatenate them into the final one.

  


  


  Any better suggestions or at least where to seek ?

  


• How to add custom glsl transition file in ffmpeg command ? Getting error like when adding glsl file is "No such filter : 'gltransition"

  22 avril 2022, par Dinesh Reddy

  I was tried with using command

  


  


  ffmpeg -i hiking.mp4 -i video2.mp4 -filter_complex "gltransition=duration=4:offset=1.5:source=crosswarp.glsl" -y outputFile.mp4

  


  


  After running this command getting error like
ERROR MESSAGE

  


  


  No such filter : 'gltransition'

  


  


  I found the way to add transitions using ffmpeg-concat library but in this way can add inbuilt transition names but in my case need to add custom transition glsl file in ffmpeg command

  


  How to overcome from this error in windows system ?

  


• Failed to convert web-saved .wemb audio to .wav by using php "shell_exec" and javascript

  30 mai 2022, par Anirbasgnaw

  I'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 my echo and print_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;
  },