diff --git a/yvi/__init__.py b/yvi/__init__.py
index 7f8c2ab..ae56df0 100644
--- a/yvi/__init__.py
+++ b/yvi/__init__.py
@@ -2,7 +2,7 @@
 Retriever tool for youtube video information.
 """
 __copyright__    = 'Copyright (C) 2020 taizan-hokuto'
-__version__      = '0.0.3'
+__version__      = '0.0.4'
 __license__      = 'MIT'
 __author__       = 'taizan-hokuto'
 __author_email__ = '55448286+taizan-hokuto@users.noreply.github.com'
diff --git a/yvi/exceptions.py b/yvi/exceptions.py
index decef13..33db96d 100644
--- a/yvi/exceptions.py
+++ b/yvi/exceptions.py
@@ -9,7 +9,16 @@ class UnknownConnectionError(Exception):
     pass
 
 
-class VideoInfoParseException(Exception):
+class VideoInfoParseError(Exception):
     '''
     thrown when failed to parse video info
-    '''
\ No newline at end of file
+    '''
+
+
+class PatternUnmatchError(VideoInfoParseError):
+    '''
+    thrown when failed to parse video info with unmatched pattern
+    '''
+    def __init__(self, doc):
+        self.msg = "PatternUnmatchError"
+        self.doc = doc
diff --git a/yvi/yvi.py b/yvi/yvi.py
index 32e0b05..667425e 100644
--- a/yvi/yvi.py
+++ b/yvi/yvi.py
@@ -4,7 +4,7 @@ import json
 import re
 import requests
 from . import util
-from . exceptions import InvalidVideoIdException, VideoInfoParseException
+from . exceptions import InvalidVideoIdException, VideoInfoParseError
 
 pattern = re.compile(r"'PLAYER_CONFIG': ({.*}}})")
 
@@ -98,14 +98,13 @@ class VideoInfo:
 
     def _parse(self, text):
         result = re.search(pattern, text)
-        gr = result.group(1)
-        if gr is None:
-            raise VideoInfoParseException("Failed to parse video info.")
-        self._res = json.loads(gr[:-1])
+        if result is None:
+            raise VideoInfoParseError("Failed to parse video info.")
+        decoder = json.JSONDecoder()
+        self._res = decoder.raw_decode(result.group(1)[:-1])[0]
         response = self._get_item(self._res, item_response)
         if response is None:
             self._check_video_is_private(self._res.get("args"))
-        
         self._renderer = self._get_item(json.loads(response), item_renderer)
         if self._renderer is None:
             raise InvalidVideoIdException(