def run_ffmpeg_multiple_files(self, input_paths, out_path, opts):
        self.check_version()

        oldest_mtime = min(
            os.stat(encodeFilename(path)).st_mtime for path in input_paths)

        files_cmd = []
        for path in input_paths:
            files_cmd.extend([encodeArgument('-i'), encodeFilename(path, True)])
        cmd = ([encodeFilename(self._executable, True), encodeArgument('-y')] +
               files_cmd +
               [encodeArgument(o) for o in opts] +
               [encodeFilename(self._ffmpeg_filename_argument(out_path), True)])

        if self._downloader.params.get('verbose', False):
            self._downloader.to_screen('[debug] ffmpeg command line: %s' % shell_quote(cmd))
        p = subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
        stdout, stderr = p.communicate()
        if p.returncode != 0:
            stderr = stderr.decode('utf-8', 'replace')
            msg = stderr.strip().split('\n')[-1]
            raise FFmpegPostProcessorError(msg)
        os.utime(encodeFilename(out_path), (oldest_mtime, oldest_mtime))
        if self._deletetempfiles:
            for ipath in input_paths:
                os.remove(ipath)
dataset/ETHPy150Open yasoob/youtube-dl-GUI/youtube_dl/postprocessor/ffmpeg.py/FFmpegPostProcessor.run_ffmpeg_multiple_files/original