diff --git a/cgo/ffmpeg/audio.go b/cgo/ffmpeg/audio.go
index 2307408..7a70d20 100644
--- a/cgo/ffmpeg/audio.go
+++ b/cgo/ffmpeg/audio.go
@@ -78,12 +78,34 @@ func (self *Resampler) Resample(in av.AudioFrame) (out av.AudioFrame, err error)
 		self.inSampleRate = in.SampleRate
 		self.inChannelLayout = in.ChannelLayout
 		avr := C.swr_alloc()
-		C.av_opt_set_int(unsafe.Pointer(avr), C.CString("in_channel_layout"), C.int64_t(channelLayoutAV2FF(self.inChannelLayout)), 0)
-		C.av_opt_set_int(unsafe.Pointer(avr), C.CString("out_channel_layout"), C.int64_t(channelLayoutAV2FF(self.OutChannelLayout)), 0)
-		C.av_opt_set_int(unsafe.Pointer(avr), C.CString("in_sample_rate"), C.int64_t(self.inSampleRate), 0)
-		C.av_opt_set_int(unsafe.Pointer(avr), C.CString("out_sample_rate"), C.int64_t(self.OutSampleRate), 0)
-		C.av_opt_set_int(unsafe.Pointer(avr), C.CString("in_sample_fmt"), C.int64_t(sampleFormatAV2FF(self.inSampleFormat)), 0)
-		C.av_opt_set_int(unsafe.Pointer(avr), C.CString("out_sample_fmt"), C.int64_t(sampleFormatAV2FF(self.OutSampleFormat)), 0)
+
+		cs1 := C.CString("in_channel_layout")
+		cs2 := C.CString("out_channel_layout")
+		cs3 := C.CString("in_sample_rate")
+		cs4 := C.CString("out_sample_rate")
+		cs5 := C.CString("in_sample_fmt")
+		cs6 := C.CString("out_sample_fmt")
+		defer C.free(unsafe.Pointer(cs1))
+		defer C.free(unsafe.Pointer(cs2))
+		defer C.free(unsafe.Pointer(cs3))
+		defer C.free(unsafe.Pointer(cs4))
+		defer C.free(unsafe.Pointer(cs5))
+		defer C.free(unsafe.Pointer(cs6))
+
+		C.av_opt_set_int(unsafe.Pointer(avr), cs1, C.int64_t(channelLayoutAV2FF(self.inChannelLayout)), 0)
+		C.av_opt_set_int(unsafe.Pointer(avr), cs2, C.int64_t(channelLayoutAV2FF(self.OutChannelLayout)), 0)
+		C.av_opt_set_int(unsafe.Pointer(avr), cs3, C.int64_t(self.inSampleRate), 0)
+		C.av_opt_set_int(unsafe.Pointer(avr), cs4, C.int64_t(self.OutSampleRate), 0)
+		C.av_opt_set_int(unsafe.Pointer(avr), cs5, C.int64_t(sampleFormatAV2FF(self.inSampleFormat)), 0)
+		C.av_opt_set_int(unsafe.Pointer(avr), cs6, C.int64_t(sampleFormatAV2FF(self.OutSampleFormat)), 0)
+		/*
+			C.av_opt_set_int(unsafe.Pointer(avr), C.CString("in_channel_layout"), C.int64_t(channelLayoutAV2FF(self.inChannelLayout)), 0)
+			C.av_opt_set_int(unsafe.Pointer(avr), C.CString("out_channel_layout"), C.int64_t(channelLayoutAV2FF(self.OutChannelLayout)), 0)
+			C.av_opt_set_int(unsafe.Pointer(avr), C.CString("in_sample_rate"), C.int64_t(self.inSampleRate), 0)
+			C.av_opt_set_int(unsafe.Pointer(avr), C.CString("out_sample_rate"), C.int64_t(self.OutSampleRate), 0)
+			C.av_opt_set_int(unsafe.Pointer(avr), C.CString("in_sample_fmt"), C.int64_t(sampleFormatAV2FF(self.inSampleFormat)), 0)
+			C.av_opt_set_int(unsafe.Pointer(avr), C.CString("out_sample_fmt"), C.int64_t(sampleFormatAV2FF(self.OutSampleFormat)), 0)
+		*/
 		C.swr_init(avr)
 		self.avr = avr
 	}
@@ -238,7 +260,10 @@ func (self *AudioEncoder) SetOption(key string, val interface{}) (err error) {
 
 	sval := fmt.Sprint(val)
 	if key == "profile" {
-		ff.profile = C.avcodec_profile_name_to_int(ff.codec, C.CString(sval))
+		cs1 := C.CString(sval)
+		defer C.free(unsafe.Pointer(cs1))
+		ff.profile = C.avcodec_profile_name_to_int(ff.codec, cs1)
+		//ff.profile = C.avcodec_profile_name_to_int(ff.codec, C.CString(sval))
 		if ff.profile == C.FF_PROFILE_UNKNOWN {
 			err = fmt.Errorf("ffmpeg: profile `%s` invalid", sval)
 			return
@@ -246,13 +271,19 @@ func (self *AudioEncoder) SetOption(key string, val interface{}) (err error) {
 		return
 	}
 
-	C.av_dict_set(&ff.options, C.CString(key), C.CString(sval), 0)
+	cs2 := C.CString(sval)
+	defer C.free(unsafe.Pointer(cs2))
+	C.av_dict_set(&ff.options, C.CString(key), cs2, 0)
+	//C.av_dict_set(&ff.options, C.CString(key), C.CString(sval), 0)
 	return
 }
 
 func (self *AudioEncoder) GetOption(key string, val interface{}) (err error) {
 	ff := &self.ff.ff
-	entry := C.av_dict_get(ff.options, C.CString(key), nil, 0)
+	cs1 := C.CString(key)
+	defer C.free(unsafe.Pointer(cs1))
+	entry := C.av_dict_get(ff.options, cs1, nil, 0)
+	//entry := C.av_dict_get(ff.options, C.CString(key), nil, 0)
 	if entry == nil {
 		err = fmt.Errorf("ffmpeg: GetOption failed: `%s` not exists", key)
 		return
@@ -650,7 +681,10 @@ func NewAudioEncoderByCodecType(typ av.CodecType) (enc *AudioEncoder, err error)
 func NewAudioEncoderByName(name string) (enc *AudioEncoder, err error) {
 	_enc := &AudioEncoder{}
 
-	codec := C.avcodec_find_encoder_by_name(C.CString(name))
+	cs1 := C.CString(name)
+	defer C.free(unsafe.Pointer(cs1))
+	codec := C.avcodec_find_encoder_by_name(cs1)
+	//codec := C.avcodec_find_encoder_by_name(C.CString(name))
 	if codec == nil || C.avcodec_get_type(codec.id) != C.AVMEDIA_TYPE_AUDIO {
 		err = fmt.Errorf("ffmpeg: cannot find audio encoder name=%s", name)
 		return
diff --git a/cgo/ffmpeg/ffmpeg.go b/cgo/ffmpeg/ffmpeg.go
index 142cc5a..3deca07 100644
--- a/cgo/ffmpeg/ffmpeg.go
+++ b/cgo/ffmpeg/ffmpeg.go
@@ -1,7 +1,7 @@
 package ffmpeg
 
 /*
-#cgo LDFLAGS: /usr/local/lib/libavcodec.a /usr/local/lib/libavformat.a /usr/local/lib/libavutil.a /usr/local/lib/libswscale.a /usr/local/lib/libswresample.a -lm -lz -llzma 
+#cgo LDFLAGS: /usr/local/lib/libavcodec.a /usr/local/lib/libavformat.a /usr/local/lib/libavutil.a /usr/local/lib/libswscale.a /usr/local/lib/libswresample.a -lm -lz -llzma
 #include "ffmpeg.h"
 void ffinit() {
 	#if LIBAVCODEC_VERSION_INT < AV_VERSION_INT(58, 9, 100)
@@ -28,11 +28,17 @@ const (
 )
 
 func HasEncoder(name string) bool {
-	return C.avcodec_find_encoder_by_name(C.CString(name)) != nil
+	cs1 := C.CString(name)
+	defer C.free(unsafe.Pointer(cs1))
+	return C.avcodec_find_encoder_by_name(cs1) != nil
+	//return C.avcodec_find_encoder_by_name(C.CString(name)) != nil
 }
 
 func HasDecoder(name string) bool {
-	return C.avcodec_find_decoder_by_name(C.CString(name)) != nil
+	cs1 := C.CString(name)
+	defer C.free(unsafe.Pointer(cs1))
+	return C.avcodec_find_decoder_by_name(cs1) != nil
+	//return C.avcodec_find_decoder_by_name(C.CString(name)) != nil
 }
 
 //func EncodersList() []string
diff --git a/cgo/ffmpeg/video.go b/cgo/ffmpeg/video.go
index 3f281a7..1ed9dc8 100644
--- a/cgo/ffmpeg/video.go
+++ b/cgo/ffmpeg/video.go
@@ -183,7 +183,10 @@ func NewVideoDecoder(stream av.CodecData) (dec *VideoDecoder, err error) {
 		return
 	}
 
-	c := C.avcodec_find_decoder_by_name(C.CString("h264_cuvid"))
+	cs1 := C.CString("h264_cuvid")
+	defer C.free(unsafe.Pointer(cs1))
+	c := C.avcodec_find_decoder_by_name(cs1)
+	//c := C.avcodec_find_decoder_by_name(C.CString("h264_cuvid"))
 	if c == nil || C.avcodec_get_type(id) != C.AVMEDIA_TYPE_VIDEO {
 		c = C.avcodec_find_decoder(id)
 		if c == nil || C.avcodec_get_type(id) != C.AVMEDIA_TYPE_VIDEO {