diff --git a/README.md b/README.md
index b7cc426..432e95f 100644
--- a/README.md
+++ b/README.md
@@ -1,5 +1,6 @@
 # imagorvideo
 
+[![Test Status](https://github.com/cshum/imagorvideo/workflows/test/badge.svg)](https://github.com/cshum/imagorvideo/actions/workflows/test.yml)
 [![Docker Hub](https://img.shields.io/badge/docker-shumc/imagorvideo-blue.svg)](https://hub.docker.com/r/shumc/imagorvideo/)
 [![GitHub Container Registry](https://ghcr-badge.herokuapp.com/cshum/imagorvideo/latest_tag?trim=major&label=ghcr.io&ignore=next,master&color=%23007ec6)](https://github.com/cshum/imagorvideo/pkgs/container/imagorvideo)
 
diff --git a/ffmpeg/errors.go b/ffmpeg/errors.go
index 128bc87..42c4685 100644
--- a/ffmpeg/errors.go
+++ b/ffmpeg/errors.go
@@ -2,10 +2,6 @@ package ffmpeg
 
 // #include "ffmpeg.h"
 import "C"
-import (
-	"strconv"
-	"unsafe"
-)
 
 type avError int
 
@@ -19,19 +15,20 @@ const (
 )
 
 func (e avError) errorString() string {
-	if e == ErrNoMem {
+	switch e {
+	case ErrNoMem:
 		return "cannot allocate memory"
-	}
-	if e == ErrTooBig {
+	case ErrTooBig:
 		return "video or cover art size exceeds maximum allowed dimensions"
+	case ErrEOF:
+		return "end of file"
+	case ErrDecoderNotFound:
+		return "decoder not found"
+	case ErrInvalidData:
+		return "invalid data found when processing input"
+	default:
+		return "unknown error occurred"
 	}
-	errString := (*C.char)(C.av_malloc(C.AV_ERROR_MAX_STRING_SIZE))
-	if errString == nil {
-		return "cannot allocate memory for error string, error code: " + strconv.Itoa(int(e))
-	}
-	defer C.av_free(unsafe.Pointer(errString))
-	C.av_make_error_string(errString, C.AV_ERROR_MAX_STRING_SIZE, C.int(e))
-	return C.GoString(errString)
 }
 
 func (e avError) Error() string {
diff --git a/ffmpeg/ffmpeg_test.go b/ffmpeg/ffmpeg_test.go
index f0a88e1..6e6a711 100644
--- a/ffmpeg/ffmpeg_test.go
+++ b/ffmpeg/ffmpeg_test.go
@@ -6,46 +6,61 @@ import (
 	"github.com/cshum/imagor/vips"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
+	"go.uber.org/zap"
 	"os"
 	"reflect"
+	"strings"
 	"testing"
 )
 
-var files = []struct {
-	file string
-}{
-	{file: "everybody-betray-me.mkv"},
-	{file: "alpha-webm.webm"},
-	{file: "schizo.flv"},
-	{file: "macabre.mp4"},
-	{file: "schizo_0.mp4"},
-	{file: "schizo_90.mp4"},
-	{file: "schizo_180.mp4"},
-	{file: "schizo_270.mp4"},
+var files = []string{
+	"everybody-betray-me.mkv",
+	"alpha-webm.webm",
+	"schizo.flv",
+	"macabre.mp4",
+	"schizo_0.mp4",
+	"schizo_90.mp4",
+	"schizo_180.mp4",
+	"schizo_270.mp4",
 }
 
 var baseDir = "../testdata/"
 
 func TestAVContextMeta(t *testing.T) {
 	vips.Startup(nil)
+	SetFFmpegLogLevel(AVLogDebug)
+	logger := zap.NewExample()
+	SetLogging(nil)
+	SetLogging(func(level AVLogLevel, message string) {
+		message = strings.TrimSuffix(message, "\n")
+		switch level {
+		case AVLogTrace, AVLogDebug, AVLogVerbose:
+			logger.Debug("ffmpeg", zap.String("log", message))
+		case AVLogInfo:
+			logger.Info("ffmpeg", zap.String("log", message))
+		case AVLogWarning, AVLogError, AVLogFatal, AVLogPanic:
+			logger.Warn("ffmpeg", zap.String("log", message))
+		}
+	})
 	require.NoError(t, os.MkdirAll(baseDir+"golden/meta", 0755))
 	require.NoError(t, os.MkdirAll(baseDir+"golden/result", 0755))
 	t.Parallel()
-	for _, tt := range files {
-		t.Run(tt.file, func(t *testing.T) {
+	for _, filename := range files {
+		t.Run(filename, func(t *testing.T) {
 			ctx := context.Background()
-			path := baseDir + tt.file
+			path := baseDir + filename
 			reader, err := os.Open(path)
 			require.NoError(t, err)
 			stats, err := os.Stat(path)
 			require.NoError(t, err)
 			av, err := LoadAVContext(ctx, reader, stats.Size())
 			require.NoError(t, err)
+			defer av.Close()
 
 			meta := av.Metadata()
 			metaBuf, err := json.Marshal(meta)
 			require.NoError(t, err)
-			goldenFile := baseDir + "golden/meta/" + tt.file + ".meta.json"
+			goldenFile := baseDir + "golden/meta/" + filename + ".meta.json"
 			if curr, err := os.ReadFile(goldenFile); err == nil {
 				assert.Equal(t, string(curr), string(metaBuf))
 			} else {
@@ -62,7 +77,7 @@ func TestAVContextMeta(t *testing.T) {
 			require.NoError(t, err)
 			buf, err = img.ExportJpeg(nil)
 			require.NoError(t, err)
-			goldenFile = baseDir + "golden/export/" + tt.file + ".jpg"
+			goldenFile = baseDir + "golden/export/" + filename + ".jpg"
 			if curr, err := os.ReadFile(goldenFile); err == nil {
 				assert.True(t, reflect.DeepEqual(curr, buf))
 			} else {
@@ -72,3 +87,12 @@ func TestAVContextMeta(t *testing.T) {
 		})
 	}
 }
+
+func TestErrors(t *testing.T) {
+	assert.Equal(t, "ffmpeg: cannot allocate memory", ErrNoMem.Error())
+	assert.Equal(t, "ffmpeg: end of file", ErrEOF.Error())
+	assert.Equal(t, "ffmpeg: unknown error occurred", ErrUnknown.Error())
+	assert.Equal(t, "ffmpeg: decoder not found", ErrDecoderNotFound.Error())
+	assert.Equal(t, "ffmpeg: invalid data found when processing input", ErrInvalidData.Error())
+	assert.Equal(t, "ffmpeg: video or cover art size exceeds maximum allowed dimensions", ErrTooBig.Error())
+}
diff --git a/ffmpeg/logging.go b/ffmpeg/logging.go
index ffa5a05..c8453cd 100644
--- a/ffmpeg/logging.go
+++ b/ffmpeg/logging.go
@@ -27,10 +27,6 @@ var (
 	onceLogging                   sync.Once
 )
 
-func logLevel() AVLogLevel {
-	return AVLogLevel(C.av_log_get_level())
-}
-
 // SetFFmpegLogLevel allows you to change the log level from the default (AVLogInfo).
 func SetFFmpegLogLevel(logLevel AVLogLevel) {
 	C.av_log_set_level(C.int(logLevel))