diff --git a/src/format/stream/stream_mut.rs b/src/format/stream/stream_mut.rs
index dd27044..65e773c 100644
--- a/src/format/stream/stream_mut.rs
+++ b/src/format/stream/stream_mut.rs
@@ -25,6 +25,12 @@ impl<'a> StreamMut<'a> {
 }
 
 impl<'a> StreamMut<'a> {
+	pub fn set_time_base<R: Into<Rational>>(&mut self, value: R) {
+		unsafe {
+			(*self.as_mut_ptr()).time_base = value.into().into();
+		}
+	}
+
 	pub fn set_frame_rate<R: Into<Rational>>(&mut self, value: R) {
 		unsafe {
 			av_stream_set_r_frame_rate(self.as_mut_ptr(), value.into().into());