diff --git a/ffmpeg/ffmpeg.go b/ffmpeg/ffmpeg.go
index 4be5509..42b7336 100644
--- a/ffmpeg/ffmpeg.go
+++ b/ffmpeg/ffmpeg.go
@@ -278,7 +278,7 @@ func convertFrameToRGB(av *AVContext) error {
 
 func exportBuffer(av *AVContext) ([]byte, error) {
 	if !av.hasFrame {
-		return nil, ErrDecoderNotFound
+		return nil, ErrInvalidData
 	}
 	size := av.height * av.width
 	if av.hasAlpha {
diff --git a/ffmpeg/ffmpeg_test.go b/ffmpeg/ffmpeg_test.go
index e3a52af..72587cf 100644
--- a/ffmpeg/ffmpeg_test.go
+++ b/ffmpeg/ffmpeg_test.go
@@ -31,6 +31,7 @@ func TestAVContext(t *testing.T) {
 	SetFFmpegLogLevel(AVLogDebug)
 	logger := zap.NewExample()
 	SetLogging(nil)
+	log(AVLogDebug, "nop logging")
 	SetLogging(func(level AVLogLevel, message string) {
 		message = strings.TrimSuffix(message, "\n")
 		switch level {
diff --git a/go.mod b/go.mod
index 7d7a4fd..ef8a13d 100644
--- a/go.mod
+++ b/go.mod
@@ -3,7 +3,7 @@ module github.com/cshum/imagorvideo
 go 1.18
 
 require (
-	github.com/cshum/imagor v1.1.1-0.20220914044842-2b4d0ec4fd38
+	github.com/cshum/imagor v1.1.1-0.20220915071030-cb478d3bcae2
 	github.com/gabriel-vasile/mimetype v1.4.1
 	github.com/stretchr/testify v1.8.0
 	go.uber.org/zap v1.23.0
diff --git a/go.sum b/go.sum
index 48c742c..c536c25 100644
--- a/go.sum
+++ b/go.sum
@@ -85,8 +85,8 @@ github.com/cncf/xds/go v0.0.0-20210805033703-aa0b78936158/go.mod h1:eXthEFrGJvWH
 github.com/cncf/xds/go v0.0.0-20210922020428-25de7278fc84/go.mod h1:eXthEFrGJvWHgFFCl3hGmgk+/aYT6PnTQLykKQRLhEs=
 github.com/cncf/xds/go v0.0.0-20211001041855-01bcc9b48dfe/go.mod h1:eXthEFrGJvWHgFFCl3hGmgk+/aYT6PnTQLykKQRLhEs=
 github.com/cncf/xds/go v0.0.0-20211011173535-cb28da3451f1/go.mod h1:eXthEFrGJvWHgFFCl3hGmgk+/aYT6PnTQLykKQRLhEs=
-github.com/cshum/imagor v1.1.1-0.20220914044842-2b4d0ec4fd38 h1:H/I3T2YJM79ZOnOuPmObsFa3qUVK+IrGADsIYvWF9aU=
-github.com/cshum/imagor v1.1.1-0.20220914044842-2b4d0ec4fd38/go.mod h1:nhOPIyQwjrbcopfe7ODwLQ7hbb+Ww5Kt6Jo29iJ+7HY=
+github.com/cshum/imagor v1.1.1-0.20220915071030-cb478d3bcae2 h1:Aho41Rj0wAHrqwBEmJgMHY4FTdTJj1b6BdvI3JW66AU=
+github.com/cshum/imagor v1.1.1-0.20220915071030-cb478d3bcae2/go.mod h1:nhOPIyQwjrbcopfe7ODwLQ7hbb+Ww5Kt6Jo29iJ+7HY=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
diff --git a/processor.go b/processor.go
index 465de19..a10cf8a 100644
--- a/processor.go
+++ b/processor.go
@@ -57,6 +57,10 @@ func (p *Processor) Process(ctx context.Context, in *imagor.Blob, params imagorp
 		if err == nil || out != nil {
 			return
 		}
+		if _, ok := err.(imagor.ErrForward); ok {
+			return
+		}
+		err = imagor.NewError(err.Error(), 406)
 		// fallback image on error
 		out = imagor.NewBlobFromBytes(transPixel)
 		if p.FallbackImage != "" {
diff --git a/processor_test.go b/processor_test.go
index f8a4316..b71541b 100644
--- a/processor_test.go
+++ b/processor_test.go
@@ -17,6 +17,7 @@ import (
 	"path/filepath"
 	"reflect"
 	"runtime"
+	"strings"
 	"testing"
 )
 
@@ -28,8 +29,9 @@ func init() {
 }
 
 type test struct {
-	name string
-	path string
+	name       string
+	path       string
+	expectCode int
 }
 
 func TestProcessor(t *testing.T) {
@@ -38,8 +40,7 @@ func TestProcessor(t *testing.T) {
 	t.Cleanup(func() {
 		require.NoError(t, v.Shutdown(context.Background()))
 	})
-	var resultDir = filepath.Join(testDataDir, "golden/result")
-	doGoldenTests(t, resultDir, []test{
+	doGoldenTests(t, filepath.Join(testDataDir, "golden/result"), []test{
 		{name: "mkv", path: "fit-in/100x100/everybody-betray-me.mkv"},
 		{name: "mkv meta", path: "meta/everybody-betray-me.mkv"},
 		{name: "mp4", path: "fit-in/100x100/schizo_0.mp4"},
@@ -47,17 +48,21 @@ func TestProcessor(t *testing.T) {
 		{name: "mp4 180", path: "fit-in/100x100/schizo_180.mp4"},
 		{name: "mp4 270", path: "fit-in/100x100/schizo_270.mp4"},
 		{name: "image", path: "fit-in/100x100/demo.png"},
-	}, WithDebug(true))
+		{name: "corrupted", path: "fit-in/100x100/corrupt/everybody-betray-me.mkv", expectCode: 406},
+	}, WithDebug(true), WithLogger(zap.NewExample()))
+	doGoldenTests(t, filepath.Join(testDataDir, "golden/result-fallback-image"), []test{
+		{name: "corrupted with fallback image", path: "fit-in/100x100/corrupt/everybody-betray-me.mkv", expectCode: 406},
+	}, WithDebug(false), WithLogger(zap.NewExample()), WithFallbackImage("demo.png"))
 }
 
 func doGoldenTests(t *testing.T, resultDir string, tests []test, opts ...Option) {
 	resStorage := filestorage.New(resultDir,
 		filestorage.WithSaveErrIfExists(true))
-	loader := filestorage.New(testDataDir)
+	fileLoader := filestorage.New(testDataDir)
 	loaders := []imagor.Loader{
-		loader,
+		fileLoader,
 		loaderFunc(func(r *http.Request, image string) (blob *imagor.Blob, err error) {
-			image, _ = loader.Path(image)
+			image, _ = fileLoader.Path(image)
 			return imagor.NewBlob(func() (reader io.ReadCloser, size int64, err error) {
 				// force read full file by 0 size
 				reader, err = os.Open(image)
@@ -67,7 +72,21 @@ func doGoldenTests(t *testing.T, resultDir string, tests []test, opts ...Option)
 	}
 	for i, loader := range loaders {
 		app := imagor.New(
-			imagor.WithLoaders(loader),
+			imagor.WithLoaders(loaderFunc(func(r *http.Request, image string) (blob *imagor.Blob, err error) {
+				if strings.HasPrefix(image, "corrupt/") {
+					image, _ = fileLoader.Path(strings.TrimPrefix(image, "corrupt/"))
+					return imagor.NewBlob(func() (reader io.ReadCloser, size int64, err error) {
+						file, err := os.Open(image)
+						// truncate so it corrupt
+						reader = &readCloser{
+							Reader: io.LimitReader(file, 1024),
+							Closer: file,
+						}
+						return
+					}), nil
+				}
+				return nil, imagor.ErrNotFound
+			}), loader),
 			imagor.WithUnsafe(true),
 			imagor.WithDebug(true),
 			imagor.WithLogger(zap.NewExample()),
@@ -85,7 +104,11 @@ func doGoldenTests(t *testing.T, resultDir string, tests []test, opts ...Option)
 					http.MethodGet, fmt.Sprintf("/unsafe/%s", tt.path), nil).WithContext(ctx)
 				app.ServeHTTP(w, req)
 				cancel()
-				assert.Equal(t, 200, w.Code)
+				if tt.expectCode == 0 {
+					assert.Equal(t, 200, w.Code)
+				} else {
+					assert.Equal(t, tt.expectCode, w.Code)
+				}
 				b := imagor.NewBlobFromBytes(w.Body.Bytes())
 				_ = resStorage.Put(context.Background(), tt.path, b)
 				path := filepath.Join(resultDir, imagorpath.Normalize(tt.path, nil))
@@ -119,3 +142,8 @@ type loaderFunc func(r *http.Request, image string) (blob *imagor.Blob, err erro
 func (f loaderFunc) Get(r *http.Request, image string) (*imagor.Blob, error) {
 	return f(r, image)
 }
+
+type readCloser struct {
+	io.Reader
+	io.Closer
+}
diff --git a/testdata/golden/result-fallback-image/fit-in/100x100/corrupt/everybody-betray-me.mkv b/testdata/golden/result-fallback-image/fit-in/100x100/corrupt/everybody-betray-me.mkv
new file mode 100644
index 0000000..24b35b4
Binary files /dev/null and b/testdata/golden/result-fallback-image/fit-in/100x100/corrupt/everybody-betray-me.mkv differ
diff --git a/testdata/golden/result/fit-in/100x100/corrupt/everybody-betray-me.mkv b/testdata/golden/result/fit-in/100x100/corrupt/everybody-betray-me.mkv
new file mode 100644
index 0000000..5bfd67a
Binary files /dev/null and b/testdata/golden/result/fit-in/100x100/corrupt/everybody-betray-me.mkv differ