diff --git a/src/demux/mod.rs b/src/demux/mod.rs
index 5fbb4aa..f84670e 100644
--- a/src/demux/mod.rs
+++ b/src/demux/mod.rs
@@ -1,3 +1,6 @@
+mod input;
+mod flv;
+
 use std::sync::mpsc;
 use std::error::Error;
 
diff --git a/src/util/mod.rs b/src/util/mod.rs
index 9a8d351..c48f2ce 100644
--- a/src/util/mod.rs
+++ b/src/util/mod.rs
@@ -1,6 +1,8 @@
 use std::error::Error;
 use std::fmt;
 
+// Data structs/enums
+
 pub struct VideoMetadata {
     pub width: u32,
     pub height: u32,
@@ -51,3 +53,25 @@ pub struct RawMedia {
     pub media_type: RawMediaType,
     pub sample: Vec<u8>,
 }
+
+// Errors
+
+pub enum GenericError {
+    UnknownSyncByte
+}
+
+impl Error for GenericError {}
+
+impl fmt::Debug for GenericError {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        match self {
+            GenericError::UnknownSyncByte => write!(f, "sync byte does not match any implemented input format"),
+        }
+    }
+}
+
+impl fmt::Display for GenericError {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        fmt::Debug::fmt(self, f)
+    }
+}