diff --git a/benchmarks/benchmark.pl b/benchmarks/benchmark.pl
index 6cd4157..76dd858 100755
--- a/benchmarks/benchmark.pl
+++ b/benchmarks/benchmark.pl
@@ -12,8 +12,8 @@ sub clamp {
     my ($start, $end) = @_;
     my @clamped = (0, 0);
 
-    $clamped[0] = $start < 15   ? 15   : $start;
-    $clamped[1] = $end   > 1500 ? 1500 : $end;
+    $clamped[0] = $start < 30   ? 30   : $start;
+    $clamped[1] = $end   > 5000 ? 5000 : $end;
 
     return @clamped;
 }
@@ -43,19 +43,20 @@ sub mk_rsock {
 }
 
 sub send_benchmark {
-    my ($lib, $addr, $port, $iter, $threads, $start, $end, $gen_recv) = @_;
-    my ($sfps, $efps) = clamp($start, $end);
+    my ($lib, $addr, $port, $iter, $threads, $gen_recv, @fps_vals) = @_;
     my ($socket, $remote, $data);
 
     $socket = mk_ssock($addr, $port);
     $remote = $socket->accept();
 
     while ($threads ne 0) {
-        for (my $i = $sfps; $i <= $efps; $i *= 2) {
-            my $logname = "send_results_$threads" . "threads_$i". "fps_$iter" . "iter";
+        foreach (@fps_vals) {
+            my $fps = $_;
+            my $logname = "send_results_$threads" . "threads_$fps". "fps_$iter" . "iter";
+
             for ((1 .. $iter)) {
                 $remote->recv($data, 16);
-                system ("time ./$lib/sender $addr $threads $i >> $lib/results/$logname 2>&1");
+                system ("time ./$lib/sender $addr $threads $fps >> $lib/results/$logname 2>&1");
                 $remote->send("end") if $gen_recv;
             }
         }
@@ -65,13 +66,12 @@ sub send_benchmark {
 }
 
 sub recv_benchmark {
-    my ($lib, $addr, $port, $iter, $threads, $start, $end) = @_;
-    my ($sfps, $efps) = clamp($start, $end);
+    my ($lib, $addr, $port, $iter, $threads, @fps_vals) = @_;
     my $socket = mk_rsock($addr, $port);
 
     while ($threads ne 0) {
-        for (my $i = $sfps; $i <= $efps; $i *= 2) {
-            my $logname = "recv_results_$threads" . "threads_$i". "fps_$iter" . "iter";
+        foreach (@fps_vals) {
+            my $logname = "recv_results_$threads" . "threads_$_". "fps_$iter" . "iter";
             for ((1 .. $iter)) {
                 $socket->send("start");
                 system ("time ./$lib/receiver $addr $threads >> $lib/results/$logname 2>&1");
@@ -84,8 +84,8 @@ sub recv_benchmark {
 
 # use netcat to capture the stream
 sub recv_generic {
-    my ($lib, $addr, $port, $iter, $threads, $start, $end) = @_;
-    my ($sfps, $efps) = clamp($start, $end);
+    my ($lib, $addr, $port, $iter, $threads, @fps_vals) = @_;
+    # my ($sfps, $efps) = clamp($start, $end);
     my $socket = mk_rsock($addr, $port);
     my $ports = "";
 
@@ -95,8 +95,8 @@ sub recv_generic {
     $ports .= (8888 + $_ * 2) . " " for ((0 .. $threads - 1));
 
     while ($threads ne 0) {
-        for (my $i = $sfps; $i <= $efps; $i *= 2) {
-            my $logname = "recv_results_$threads" . "threads_$i". "fps";
+        foreach (@fps_vals) {
+            my $logname = "recv_results_$threads" . "threads_$_". "fps";
             system "parallel --files nc -kluvw 0 $addr ::: $ports &";
             $socket->send("start");
             $socket->recv(my $data, 16);
@@ -155,7 +155,7 @@ sub print_help {
     . "\t--port <server port>\n"
     . "\t--lib <uvgrtp|ffmpeg|gstreamer>\n\n" and exit;
 }
-    
+
 GetOptions(
     "lib|l=s"     => \(my $lib = ""),
     "role|r=s"    => \(my $role = ""),
@@ -165,16 +165,33 @@ GetOptions(
     "threads|t=i" => \(my $threads = 1),
     "start|s=f"   => \(my $start = 0),
     "end|e=f"     => \(my $end = 0),
+    "step=i"      => \(my $step = 0),
     "use-nc"      => \(my $nc = 0),
+    "fps=s"       => \(my $fps = ""),
     "latency"     => \(my $lat = 0),
     "help"        => \(my $help = 0)
 ) or die "failed to parse command line!\n";
 
 print_help() if $help;
 print_help() if !$lib or !$addr or !$port;
-print_help() if (!$start or !$end) and !$lat;
+print_help() if ((!$start or !$end) and !$fps) and !$lat;
 
 die "not implemented\n" if !grep (/$lib/, ("uvgrtp", "ffmpeg"));
+my @fps_vals = ();
+
+if (!$lat) {
+    if ($fps) {
+        @fps_vals = split ",", $fps;
+    } else {
+        ($start, $end) = clamp($start, $end);
+        for (my $i = $start; $i <= $end; ) {
+            push @fps_vals, $i;
+
+            if ($step) { $i += $step; }
+            else       { $i *= 2; }
+        }
+    }
+}
 
 if ($role eq "send") {
     if ($lat) {
@@ -182,7 +199,7 @@ if ($role eq "send") {
         lat_send($lib, $addr, $port, $role);
     } else {
         system "make $lib" . "_sender";
-        send_benchmark($lib, $addr, $port, $iter, $threads, $start, $end, $nc);
+        send_benchmark($lib, $addr, $port, $iter, $threads, $nc, @fps_vals);
     }
 } elsif ($role eq "recv" ) {
     if ($lat) {
@@ -190,9 +207,9 @@ if ($role eq "send") {
         lat_recv($lib, $addr, $port, $role);
     } elsif (!$nc) {
         system "make $lib" . "_receiver";
-        recv_benchmark($lib, $addr, $port, $iter, $threads, $start, $end);
+        recv_benchmark($lib, $addr, $port, $iter, $threads, @fps_vals);
     } else {
-        recv_generic($lib, $addr, $port, $iter, $threads, $start, $end);
+        recv_generic($lib, $addr, $port, $iter, $threads, @fps_vals);
     }
 } else {
     print "invalid role: '$role'\n" and exit;