diff --git a/src/format/context/common.rs b/src/format/context/common.rs
index 4f50366..305f442 100644
--- a/src/format/context/common.rs
+++ b/src/format/context/common.rs
@@ -1,7 +1,7 @@
 use std::mem;
 use std::ptr;
 use std::rc::Rc;
-
+use std::fmt;
 use super::destructor::{self, Destructor};
 use ffi::*;
 use libc::{c_int, c_uint};
@@ -41,7 +41,7 @@ impl Context {
         'a: 'b,
     {
         unsafe {
-            if index >= (*self.as_ptr()).nb_streams as usize {
+            if index >= self.nb_streams() as usize {
                 None
             } else {
                 Some(Stream::wrap(self, index))
@@ -54,7 +54,7 @@ impl Context {
         'a: 'b,
     {
         unsafe {
-            if index >= (*self.as_ptr()).nb_streams as usize {
+            if index >= self.nb_streams() as usize {
                 None
             } else {
                 Some(StreamMut::wrap(self, index))
@@ -70,10 +70,20 @@ impl Context {
         StreamIterMut::new(self)
     }
 
+    #[inline]
+    fn nb_streams(&self) -> u32 {
+        unsafe { (*self.as_ptr()).nb_streams }
+    }
+
+    pub fn bit_rate(&self) -> i64 {
+        unsafe { (*self.as_ptr()).bit_rate }
+    }
+
     pub fn duration(&self) -> i64 {
         unsafe { (*self.as_ptr()).duration }
     }
 
+    #[inline]
     pub fn nb_chapters(&self) -> u32 {
         unsafe { (*self.as_ptr()).nb_chapters }
     }
@@ -83,7 +93,7 @@ impl Context {
         'a: 'b,
     {
         unsafe {
-            if index >= (*self.as_ptr()).nb_chapters as usize {
+            if index >= self.nb_chapters() as usize {
                 None
             } else {
                 Some(Chapter::wrap(self, index))
@@ -96,7 +106,7 @@ impl Context {
         'a: 'b,
     {
         unsafe {
-            if index >= (*self.as_ptr()).nb_chapters as usize {
+            if index >= self.nb_chapters() as usize {
                 None
             } else {
                 Some(ChapterMut::wrap(self, index))
@@ -218,7 +228,7 @@ impl<'a> Iterator for StreamIter<'a> {
 
     fn next(&mut self) -> Option<<Self as Iterator>::Item> {
         unsafe {
-            if self.current >= (*self.context.as_ptr()).nb_streams {
+            if self.current >= self.context.nb_streams() {
                 return None;
             }
 
@@ -229,15 +239,13 @@ impl<'a> Iterator for StreamIter<'a> {
     }
 
     fn size_hint(&self) -> (usize, Option<usize>) {
-        unsafe {
-            let length = (*self.context.as_ptr()).nb_streams as usize;
+        let length = self.context.nb_streams() as usize;
 
             (
                 length - self.current as usize,
                 Some(length - self.current as usize),
             )
         }
-    }
 }
 
 impl<'a> ExactSizeIterator for StreamIter<'a> {}
@@ -260,13 +268,12 @@ impl<'a> Iterator for StreamIterMut<'a> {
     type Item = StreamMut<'a>;
 
     fn next(&mut self) -> Option<<Self as Iterator>::Item> {
-        unsafe {
-            if self.current >= (*self.context.as_ptr()).nb_streams {
+        if self.current >= self.context.nb_streams() {
                 return None;
             }
-
             self.current += 1;
 
+        unsafe {
             Some(StreamMut::wrap(
                 mem::transmute_copy(&self.context),
                 (self.current - 1) as usize,
@@ -275,15 +282,13 @@ impl<'a> Iterator for StreamIterMut<'a> {
     }
 
     fn size_hint(&self) -> (usize, Option<usize>) {
-        unsafe {
-            let length = (*self.context.as_ptr()).nb_streams as usize;
+        let length = self.context.nb_streams() as usize;
 
             (
                 length - self.current as usize,
                 Some(length - self.current as usize),
             )
         }
-    }
 }
 
 impl<'a> ExactSizeIterator for StreamIterMut<'a> {}
@@ -376,3 +381,14 @@ impl<'a> Iterator for ChapterIterMut<'a> {
 }
 
 impl<'a> ExactSizeIterator for ChapterIterMut<'a> {}
+
+impl fmt::Debug for Context {
+    fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
+        let mut s = fmt.debug_struct("AVFormatContext");
+        s.field("bit_rate", &self.bit_rate());
+        s.field("duration", &self.duration());
+        s.field("nb_chapters", &self.nb_chapters());
+        s.field("nb_streams", &self.nb_streams());
+        s.finish()
+    }
+}
diff --git a/src/format/stream/stream.rs b/src/format/stream/stream.rs
index c6a2d84..4a4a652 100644
--- a/src/format/stream/stream.rs
+++ b/src/format/stream/stream.rs
@@ -5,6 +5,7 @@ use format::context::common::Context;
 use libc::c_int;
 use {DictionaryRef, Discard, Rational};
 
+#[derive(Debug)]
 pub struct Stream<'a> {
     context: &'a Context,
     index: usize,