diff --git a/pkg/codec/codec.go b/pkg/codec/codec.go
index f174e08..e3e0057 100644
--- a/pkg/codec/codec.go
+++ b/pkg/codec/codec.go
@@ -11,11 +11,6 @@ type VideoEncoder interface {
 	Close() error
 }
 
-type VideoDecoder interface {
-	Decode([]byte) (image.Image, error)
-	Close() error
-}
-
 type VideoSetting struct {
 	Width, Height             int
 	TargetBitRate, MaxBitRate int
@@ -23,7 +18,6 @@ type VideoSetting struct {
 }
 
 type VideoEncoderBuilder func(s VideoSetting) (VideoEncoder, error)
-type VideoDecoderBuilder func(s VideoSetting) (VideoDecoder, error)
 
 type AudioSetting struct {
 	InSampleRate, OutSampleRate int
diff --git a/pkg/codec/registrar.go b/pkg/codec/registrar.go
index e226833..4e3a128 100644
--- a/pkg/codec/registrar.go
+++ b/pkg/codec/registrar.go
@@ -8,7 +8,6 @@ import (
 
 var (
 	videoEncoders = make(map[string]VideoEncoderBuilder)
-	videoDecoders = make(map[string]VideoDecoderBuilder)
 	audioEncoders = make(map[string]AudioEncoderBuilder)
 )
 
@@ -16,8 +15,6 @@ func Register(name string, builder interface{}) {
 	switch b := builder.(type) {
 	case VideoEncoderBuilder:
 		videoEncoders[name] = b
-	case VideoDecoderBuilder:
-		videoDecoders[name] = b
 	case AudioEncoderBuilder:
 		audioEncoders[name] = b
 	}
@@ -32,15 +29,6 @@ func BuildVideoEncoder(name string, s VideoSetting) (VideoEncoder, error) {
 	return b(s)
 }
 
-func BuildVideoDecoder(name string, s VideoSetting) (VideoDecoder, error) {
-	b, ok := videoDecoders[name]
-	if !ok {
-		return nil, fmt.Errorf("codec: can't find %s video decoder", name)
-	}
-
-	return b(s)
-}
-
 func BuildAudioEncoder(name string, r audio.Reader, s AudioSetting) (io.ReadCloser, error) {
 	b, ok := audioEncoders[name]
 	if !ok {