diff --git a/server/internal/capture/streamsink.go b/server/internal/capture/streamsink.go
index 03cb16d..61eb315 100644
--- a/server/internal/capture/streamsink.go
+++ b/server/internal/capture/streamsink.go
@@ -145,7 +145,7 @@ func (manager *StreamSinkManagerCtx) createPipeline() error {
 	}
 
 	appsinkSubfix := "audio"
-	if codec.IsVideo(manager.codec.Type) {
+	if manager.codec.IsVideo() {
 		appsinkSubfix = "video"
 	}
 
diff --git a/server/internal/types/codec/codecs.go b/server/internal/types/codec/codecs.go
index 621655e..4c5b843 100644
--- a/server/internal/types/codec/codecs.go
+++ b/server/internal/types/codec/codecs.go
@@ -50,14 +50,6 @@ func ParseStr(codecName string) (codec RTPCodec, ok bool) {
 	return
 }
 
-func IsVideo(codecType webrtc.RTPCodecType) bool {
-	return codecType == webrtc.RTPCodecTypeVideo
-}
-
-func IsAudio(codecType webrtc.RTPCodecType) bool {
-	return codecType == webrtc.RTPCodecTypeAudio
-}
-
 type RTPCodec struct {
 	Name        string
 	PayloadType webrtc.PayloadType
@@ -72,6 +64,14 @@ func (codec RTPCodec) Register(engine *webrtc.MediaEngine) error {
 	}, codec.Type)
 }
 
+func (codec RTPCodec) IsVideo() bool {
+	return codec.Type == webrtc.RTPCodecTypeVideo
+}
+
+func (codec RTPCodec) IsAudio() bool {
+	return codec.Type == webrtc.RTPCodecTypeAudio
+}
+
 func VP8() RTPCodec {
 	return RTPCodec{
 		Name:        "vp8",