--- a/generateHourlys.php
+++ b/generateHourlys.php
@@ -1,24 +1,33 @@
 <?php
 include('common.inc.php');
-$sth = $conn->prepare("select tgid, extract(hour from call_timestamp) ahour, date_trunc('day', call_timestamp) aday, count(filename), array_to_string(array_agg(filename), ',') filenames from recordings group by tgid, ahour, aday order by  aday DESC, ahour, tgid;");
-
-$sth->execute();
-$hourlies = $sth->fetchAll(PDO::FETCH_ASSOC);
-foreach($hourlies as $hourly) {
+function processHourly($hourly) {
     $filename = $hourly['tgid'].'-'.str_replace(' 00:00:00+1','',$hourly['aday']).'-'.$hourly['ahour'].'.3gp';
 
     if(!file_exists("hourly/".$filename)) {
 
         $filenames = explode(",",$hourly['filenames']);
-    $cmd = "/usr/local/bin/ffmpeg -i data/".implode(" -i data/",$filenames)." -ar 8000 -ab 4.75k -ac 1 hourly/".$filename . ' 2>&1';
-                    //print_r($hourly);
+        $cmd = "/usr/local/bin/ffmpeg -filter_complex concat=n=".count($filenames).":v=0:a=1 -i data/".implode(" -i data/",$filenames)." -ar 8000 -ab 4.75k -ac 1 hourly/".$filename . ' 2>&1';
+        //print_r($hourly);
         exec ( $cmd,$output,$returncode );
-        echo $cmd.'<br>';
+        echo $cmd."<br>\n";
         if ($returncode != 10) {
             //print_r($output);
             //die();
         }
     }
 }
+$sth = $conn->prepare("select tgid, extract(hour from call_timestamp) ahour, date_trunc('day', call_timestamp) aday, count(filename), array_to_string(array_agg(filename order by call_timestamp), ',') filenames from recordings group by tgid, ahour, aday order by  aday DESC, ahour, tgid;");
 
+$sth->execute();
+$hourlies = $sth->fetchAll(PDO::FETCH_ASSOC);
+foreach($hourlies as $hourly) {
+    processHourly($hourly);
+}
+$sth = $conn->prepare("select 'hour' as tgid, extract(hour from call_timestamp) ahour, date_trunc('day', call_timestamp) aday, count(filename), array_to_string(array_agg(filename order by call_timestamp), ',') filenames from recordings group by ahour, aday order by  aday DESC, ahour;");
 
+$sth->execute();
+$hourlies = $sth->fetchAll(PDO::FETCH_ASSOC);
+foreach($hourlies as $hourly) {
+    processHourly($hourly);
+}
+