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diff --git a/application/helpers/av_info_helper.php b/application/helpers/av_info_helper.php
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+++ b/application/helpers/av_info_helper.php
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+<?php
+
+/*
+ * These functions retrieve information about audio and video files.
+ * Depends on MediaInfo CLI program (http://mediainfo.sourceforge.net/)
+ * 
+ * @author Călin-Andrei Burloiu
+ */
+
+/**
+ *
+ * @param string $params mediainfo parameters, including the input file name
+ * passed as in shell
+ * @return string mediainfo standard output
+ */
+function exec_mediainfo($params)
+{
+	// If file does not exist it exists with code 1. If file is not a valid
+	// audio/video file it exists with code 0 and outputs nothing.
+	$h = popen('mediainfo ' . $params . ' 2>&1', 'r');
+
+	$r = fgets($h, 512);
+	$r = trim($r);
+	
+	if (pclose($h) > 0 || empty($r))
+		return FALSE;
+	
+	return $r;
+}
+
+/**
+ * Returns duration in hours, minutes and seconds for an audio/video file.
+ *
+ * @param string $file_name 
+ * @return array an associative array with keys 'h', 'min', 's'
+ */
+function get_av_duration($file_name)
+{
+	$output = exec_mediainfo(
+			'--Inform="General;%Duration/String3%" "'. $file_name. '"');
+	
+	if (!$output)
+		return FALSE;
+	
+	$toks = explode(':', $output);
+	$res['h'] = intval($toks[0]);
+	$res['min'] = intval($toks[1]);
+	$res['s'] = floatval($toks[2]);
+	
+	return $res;
+}
+
+/**
+ * Returns video width size in pixels.
+ * 
+ * @param string $file_name
+ * @return int
+ */
+function get_video_width($file_name)
+{
+	$output = exec_mediainfo(
+			'--Inform="Video;%Width%" "'. $file_name. '"');
+	
+	if (!$output)
+		return FALSE;
+	
+	return intval($output);
+}
+
+/**
+ * Returns video height size in pixels.
+ * 
+ * @param string $file_name
+ * @return int
+ */
+function get_video_height($file_name)
+{
+	$output = exec_mediainfo(
+			'--Inform="Video;%Height%" "'. $file_name. '"');
+	
+	if (!$output)
+		return FALSE;
+	
+	return intval($output);
+}
+
+/**
+ * Returns Display Aspect Ration (DAR) of a video.
+ * 
+ * @param string $file_name
+ * @return string a ratio represented a two integers separated by a colon
+ */
+function get_video_dar($file_name)
+{
+	$output = exec_mediainfo(
+			'--Inform="Video;%DisplayAspectRatio/String%" "'. $file_name. '"');
+	
+	if (!$output)
+		return FALSE;
+	
+	return $output;
+}
+
+/* End of file av_info_helper.php */
+/* Location: ./application/helpers/av_info_helper.php */
\ No newline at end of file