Get Duration Of Remote Videos

I am trying to get duration of remote videos (which range from 5 seconds to 10 minutes), I am currently testing with 4 videos on my remote server, I am able to get the duration of 1 or 2 videos while the others throw a IllegalArgumentException setDataSource failed: status = 0xFFFFFFFF. This doesn't always happen with the same videos, if I run the code again, some videos will successfully return the duration (even if they failed when running the code previously) while others that returned the duration will fail, basically it's random, some fail and some are successful and this results changes with each launch eg:

run code #1

• video 1 returns duration successfully
• video 2 fails with IllegalArgumentException
• video 3 fails with IllegalArgumentException
• video 4 returns duration successfully

run code #2

• video 1 fails with IllegalArgumentException
• video 2 fails with IllegalArgumentException
• video 3 returns duration successfully
• video 4 returns duration successfully

run code #3

• video 1 fails with IllegalArgumentException
• video 2 fails with IllegalArgumentException
• video 3 returns duration successfully
• video 4 fails with IllegalArgumentException

etc..

code:

    private void getFTP_DurationArray() {

        //Get File Names From FTP
        FTPClient client = new FTPClient();
        try {
            client.connect(myFTP_Server);
            client.enterLocalPassiveMode();
            client.login(myFTP_Username, myFTP_Password);
            client.changeWorkingDirectory(skyVideos_OPEN_Active_ftpDir);
            FTPFile[] files = client.listFiles();

            //SORT BY TIMESTAMP
            Arrays.sort(files,
                    Comparator.comparing((FTPFile remoteFile) -> remoteFile.getTimestamp()).reversed());

            file_path_remote = myDomain + "/" + skyVideos_OPEN_Active;

            for (FTPFile file : files) {

                if (file.isFile())
                {
                    //GetDuration
                    try{
                        //NOTE: must not use https
                        mmr = new FFmpegMediaMetadataRetriever();
                        mmr.setDataSource(myDomain_no_https + "/" + skyVideos_OPEN_Active+"/"+file.getName());
                        long duration =Long.parseLong(mmr.extractMetadata(FFmpegMediaMetadataRetriever.METADATA_KEY_DURATION));
                        duration=duration/1000;
                        long minute=duration/(60);
                        long second=duration-(minute*60);
                        mmr.release();

                        strDuration = String.format("%02d:%02d" , minute, second);

                        Log.d("LOG", "strDuration " +strDuration + " -> "+file_name_remote);

                        arrListStr_Duration.add(strDuration);
                        stringArr_Duration = new String[arrListStr_Duration.size()];
                        stringArr_Duration = arrListStr_Duration.toArray(stringArr_Duration);

                    } catch (IllegalStateException e) {
                        Log.d("LOG", "IllegalStateException " + " -> "+e + " "+file_name_remote);

                    }catch (IllegalArgumentException e) {
                        Log.d("LOG", "IllegalArgumentException " + " -> "+e +" "+file_name_remote);

                    }
                }
            }
            client.disconnect();

        } catch (IOException e) {
            e.printStackTrace();

            Log.d("LOG", "IOException: " +e);
        }
    }