diff --git a/avi_r/reader.py b/avi_r/reader.py
index f4df2bc..1fa8aac 100644
--- a/avi_r/reader.py
+++ b/avi_r/reader.py
@@ -60,8 +60,8 @@ def __init__(self, video_path: str, parent_dir: str = '',
         self._init()
         self.num_frames = self._stream.duration
         self.frame_rate = float(self._stream.average_rate)
-        self.height = self._stream.codec_context.format.height
-        self.width = self._stream.codec_context.format.width
+        self.height = self._stream.codec_context.height
+        self.width = self._stream.codec_context.width
 
         # Deprecated attributes
         self.length = self.num_frames
diff --git a/docs/version.md b/docs/version.md
index 1b9c3be..66947cf 100644
--- a/docs/version.md
+++ b/docs/version.md
@@ -1,5 +1,9 @@
 # Version History
 
+## AVI-R v1.3.5
+
+* More robust extraction of frame size.
+
 ## AVI-R v1.3.4
 
 * Ignore errors in metadata decoding.
diff --git a/setup.py b/setup.py
index 18ecdc2..343064f 100644
--- a/setup.py
+++ b/setup.py
@@ -8,7 +8,7 @@
 
 setuptools.setup(
     name='avi-r',
-    version='1.3.4',
+    version='1.3.5',
     author='Lijun Yu',
     author_email='lijun@lj-y.com',
     description='A robust reader for avi videos.',