diff --git a/src/demux/flv.rs b/src/demux/flv.rs
index a23f4b8..3a03b6d 100644
--- a/src/demux/flv.rs
+++ b/src/demux/flv.rs
@@ -86,11 +86,11 @@ impl input::FileReader for FLVReader {
         let (packet_type, mut data) = self.read_packet()?;
         return match packet_type {
             FLVTagType::Audio => Ok(util::NALUPacket { 
-                packet_type: util::NALUPacketType::Audio,
+                packet_type: util::NALUPacketType::Audio(*metadata.audio.codec.as_ref().unwrap()),
                 packet_data: nalu::prepend_a(data, &metadata),
             }),
             FLVTagType::Video => Ok(util::NALUPacket {
-                packet_type: util::NALUPacketType::Video,
+                packet_type: util::NALUPacketType::Video(*metadata.video.codec.as_ref().unwrap()),
                 packet_data: nalu::prepend_v(data, &metadata),
             }),
             _ => Err(Box::new(util::DemuxerError::FLVUnexpectedTag))
diff --git a/src/demux/input.rs b/src/demux/input.rs
index 51990b4..66644b3 100644
--- a/src/demux/input.rs
+++ b/src/demux/input.rs
@@ -31,13 +31,13 @@ pub trait FileReader {
                 }
             };
             match nalu.packet_type {
-                util::NALUPacketType::Audio => {
+                util::NALUPacketType::Audio(_) => {
                     match a_in.send(nalu) {
                         Ok(_) => (),
                         Err(err) => {util::thread_freeze(err_in, Box::new(err)); return}
                     }
                 }
-                util::NALUPacketType::Video => {
+                util::NALUPacketType::Video(_) => {
                     match v_in.send(nalu) {
                         Ok(_) => (),
                         Err(err) => {util::thread_freeze(err_in, Box::new(err)); return}
diff --git a/src/util/mod.rs b/src/util/mod.rs
index 2039435..c1f40f5 100644
--- a/src/util/mod.rs
+++ b/src/util/mod.rs
@@ -13,6 +13,7 @@ pub struct VideoMetadata {
     pub codec: Option<VideoCodec>,
 }
 
+#[derive(Copy, Clone)]
 pub enum VideoCodec {
     H264,
     VP9,
@@ -25,6 +26,7 @@ pub struct AudioMetadata {
     pub codec: Option<AudioCodec>,
 }
 
+#[derive(Copy, Clone)]
 pub enum AudioCodec {
     AAC,
     OPUS,
@@ -52,8 +54,8 @@ impl Metadata {
 }
 
 pub enum NALUPacketType {
-    Audio,
-    Video,
+    Audio(AudioCodec),
+    Video(VideoCodec),
 }
 
 pub struct NALUPacket {