diff --git a/src/util/dictionary/mutable.rs b/src/util/dictionary/mutable.rs
index 25ce2b0..7839daa 100644
--- a/src/util/dictionary/mutable.rs
+++ b/src/util/dictionary/mutable.rs
@@ -25,7 +25,7 @@ impl<'a> Ref<'a> {
 }
 
 impl<'a> Ref<'a> {
-	pub fn set(&mut self, key: &str, value: &str) {
+	pub fn set(&mut self, key: &str, value: &str) -> &mut Self {
 		unsafe {
 			let key = CString::new(key).unwrap();
 			let value = CString::new(value).unwrap();
@@ -38,6 +38,8 @@ impl<'a> Ref<'a> {
 			self.ptr = ptr;
 			self.imm = immutable::Ref::wrap(ptr);
 		}
+
+		self
 	}
 }
 
diff --git a/src/util/dictionary/owned.rs b/src/util/dictionary/owned.rs
index d15eaa8..f2aed24 100644
--- a/src/util/dictionary/owned.rs
+++ b/src/util/dictionary/owned.rs
@@ -24,11 +24,11 @@ impl Owned {
 		result
 	}
 
-	pub fn as_ptr(&self) -> *const AVDictionary {
+	pub unsafe fn as_ptr(&self) -> *const AVDictionary {
 		self.ptr
 	}
 
-	pub fn as_mut_ptr(&mut self) -> *mut AVDictionary {
+	pub unsafe fn as_mut_ptr(&mut self) -> *mut AVDictionary {
 		self.ptr
 	}
 }
@@ -47,6 +47,15 @@ impl Owned {
 	pub fn as_mut(&self) -> mutable::Ref {
 		unsafe { mutable::Ref::wrap(self.ptr) }
 	}
+
+	pub fn iter(&self) -> Iter<'_> {
+		unsafe { Iter::new(self.as_ptr()) }
+	}
+
+	pub fn set(&mut self, key: &str, value: &str) -> &mut Self {
+		self.as_mut().set(key, value);
+		self
+	}
 }
 
 impl<'a> FromIterator<(&'a str, &'a str)> for Owned {