diff --git a/examples/demuxing_decoding/main.go b/examples/demuxing_decoding/main.go
index e2f4c92..fdc8f0c 100644
--- a/examples/demuxing_decoding/main.go
+++ b/examples/demuxing_decoding/main.go
@@ -23,7 +23,7 @@ type stream struct {
 func main() {
 	// Handle ffmpeg logs
 	astiav.SetLogLevel(astiav.LogLevelDebug)
-	astiav.SetLogCallback(func(l astiav.LogLevel, msg, parent string) {
+	astiav.SetLogCallback(func(l astiav.LogLevel, fmt, msg, parent string) {
 		log.Printf("ffmpeg log: %s (level: %d)\n", strings.TrimSpace(msg), l)
 	})
 
diff --git a/examples/filtering/main.go b/examples/filtering/main.go
index 418fba0..0028114 100644
--- a/examples/filtering/main.go
+++ b/examples/filtering/main.go
@@ -37,7 +37,7 @@ type stream struct {
 func main() {
 	// Handle ffmpeg logs
 	astiav.SetLogLevel(astiav.LogLevelDebug)
-	astiav.SetLogCallback(func(l astiav.LogLevel, msg, parent string) {
+	astiav.SetLogCallback(func(l astiav.LogLevel, fmt, msg, parent string) {
 		log.Printf("ffmpeg log: %s (level: %d)\n", strings.TrimSpace(msg), l)
 	})
 
diff --git a/examples/remuxing/main.go b/examples/remuxing/main.go
index 61580c1..65c7c47 100644
--- a/examples/remuxing/main.go
+++ b/examples/remuxing/main.go
@@ -18,7 +18,7 @@ var (
 func main() {
 	// Handle ffmpeg logs
 	astiav.SetLogLevel(astiav.LogLevelDebug)
-	astiav.SetLogCallback(func(l astiav.LogLevel, msg, parent string) {
+	astiav.SetLogCallback(func(l astiav.LogLevel, fmt, msg, parent string) {
 		log.Printf("ffmpeg log: %s (level: %d)\n", strings.TrimSpace(msg), l)
 	})
 
diff --git a/examples/transcoding/main.go b/examples/transcoding/main.go
index c194fe7..4f2c361 100644
--- a/examples/transcoding/main.go
+++ b/examples/transcoding/main.go
@@ -42,7 +42,7 @@ type stream struct {
 func main() {
 	// Handle ffmpeg logs
 	astiav.SetLogLevel(astiav.LogLevelDebug)
-	astiav.SetLogCallback(func(l astiav.LogLevel, msg, parent string) {
+	astiav.SetLogCallback(func(l astiav.LogLevel, fmt, msg, parent string) {
 		log.Printf("ffmpeg log: %s (level: %d)\n", strings.TrimSpace(msg), l)
 	})
 
diff --git a/log.go b/log.go
index 6f152cb..0e52734 100644
--- a/log.go
+++ b/log.go
@@ -3,7 +3,7 @@ package astiav
 //#cgo pkg-config: libavutil
 //#include <libavutil/log.h>
 /*
-extern void goAstiavLogCallback(int level, char* msg, char* parent);
+extern void goAstiavLogCallback(int level, char* fmt, char* msg, char* parent);
 
 static inline void astiavLogCallback(void *avcl, int level, const char *fmt, va_list vl)
 {
@@ -15,7 +15,7 @@ static inline void astiavLogCallback(void *avcl, int level, const char *fmt, va_
 	}
 	char msg[1024];
 	vsprintf(msg, fmt, vl);
-	goAstiavLogCallback(level, msg, parent);
+	goAstiavLogCallback(level, (char*)(fmt), msg, parent);
 }
 static inline void astiavSetLogCallback()
 {
@@ -51,7 +51,7 @@ func SetLogLevel(l LogLevel) {
 	C.av_log_set_level(C.int(l))
 }
 
-type LogCallback func(l LogLevel, msg, parent string)
+type LogCallback func(l LogLevel, fmt, msg, parent string)
 
 var logCallback LogCallback
 
@@ -61,11 +61,11 @@ func SetLogCallback(c LogCallback) {
 }
 
 //export goAstiavLogCallback
-func goAstiavLogCallback(level C.int, msg, parent *C.char) {
+func goAstiavLogCallback(level C.int, fmt, msg, parent *C.char) {
 	if logCallback == nil {
 		return
 	}
-	logCallback(LogLevel(level), C.GoString(msg), C.GoString(parent))
+	logCallback(LogLevel(level), C.GoString(fmt), C.GoString(msg), C.GoString(parent))
 }
 
 func ResetLogCallback() {
diff --git a/log_test.go b/log_test.go
index a21846e..6651246 100644
--- a/log_test.go
+++ b/log_test.go
@@ -8,14 +8,16 @@ import (
 )
 
 type logItem struct {
+	fmt string
 	l   astiav.LogLevel
 	msg string
 }
 
 func TestLog(t *testing.T) {
 	var lis []logItem
-	astiav.SetLogCallback(func(l astiav.LogLevel, msg, parent string) {
+	astiav.SetLogCallback(func(l astiav.LogLevel, fmt, msg, parent string) {
 		lis = append(lis, logItem{
+			fmt: fmt,
 			l:   l,
 			msg: msg,
 		})
@@ -27,14 +29,17 @@ func TestLog(t *testing.T) {
 	astiav.Log(astiav.LogLevelFatal, "fatal")
 	require.Equal(t, []logItem{
 		{
+			fmt: "warning",
 			l:   astiav.LogLevelWarning,
 			msg: "warning",
 		},
 		{
+			fmt: "error",
 			l:   astiav.LogLevelError,
 			msg: "error",
 		},
 		{
+			fmt: "fatal",
 			l:   astiav.LogLevelFatal,
 			msg: "fatal",
 		},