diff --git a/filter/filter_test.go b/filter/filter_test.go
index d741069c..47800d52 100644
--- a/filter/filter_test.go
+++ b/filter/filter_test.go
@@ -25,18 +25,9 @@ LICENSE
 package filter
 
 import (
-	"io"
-	"os"
 	"testing"
 )
 
-const (
-	outBasic = "testout/test_outBasic.mjpeg"
-	outDiff  = "testout/test_outDiff.mjpeg"
-	outKNN   = "testout/test_outKNN.mjpeg"
-	outMOG   = "testout/test_outMOG.mjpeg"
-)
-
 const (
 	debug             = false
 	motionDownscaling = 1
@@ -57,9 +48,15 @@ const (
 	MOGHistory   = 500
 )
 
+type d struct {
+}
+
+func (d *d) Write(p []byte) (int, error) { return len(p), nil }
+func (d *d) Close() error                { return nil }
+
 func BenchmarkBasic(b *testing.B) {
-	file, _ := os.Create(outBasic)
-	f := NewBasic(io.WriteCloser(file), debug, BasicThreshold, BasicPixels)
+	buffer := &d{}
+	f := NewBasic(buffer, debug, BasicThreshold, BasicPixels)
 	b.Log("Frames: ", len(testPackets))
 	for n := 0; n < b.N; n++ {
 		for _, x := range testPackets {
@@ -72,8 +69,8 @@ func BenchmarkBasic(b *testing.B) {
 }
 
 func BenchmarkDifference(b *testing.B) {
-	file, _ := os.Create(outDiff)
-	f := NewDifference(io.WriteCloser(file), debug, DiffThreshold)
+	buffer := &d{}
+	f := NewDifference(buffer, debug, DiffThreshold)
 	b.Log("Frames: ", len(testPackets))
 	for n := 0; n < b.N; n++ {
 		for _, x := range testPackets {
@@ -86,8 +83,8 @@ func BenchmarkDifference(b *testing.B) {
 }
 
 func BenchmarkKNN(b *testing.B) {
-	file, _ := os.Create(outKNN)
-	f := NewKNN(io.WriteCloser(file), KNNMinArea, KNNThreshold, KNNHistory, KNNKernel, debug, motionInterval, motionDownscaling)
+	buffer := &d{}
+	f := NewKNN(buffer, KNNMinArea, KNNThreshold, KNNHistory, KNNKernel, debug, motionInterval, motionDownscaling)
 	b.Log("Frames: ", len(testPackets))
 	for n := 0; n < b.N; n++ {
 		for _, x := range testPackets {
@@ -100,8 +97,8 @@ func BenchmarkKNN(b *testing.B) {
 }
 
 func BenchmarkMOG(b *testing.B) {
-	file, _ := os.Create(outMOG)
-	f := NewMOG(io.WriteCloser(file), MOGMinArea, MOGThreshold, MOGHistory, debug, motionInterval, motionDownscaling)
+	buffer := &d{}
+	f := NewMOG(buffer, MOGMinArea, MOGThreshold, MOGHistory, debug, motionInterval, motionDownscaling)
 	b.Log("Frames: ", len(testPackets))
 	for n := 0; n < b.N; n++ {
 		for _, x := range testPackets {