cleanup

mp4/demuxer.py

@@ -34,16 +34,16 @@ class Demuxer:
             raise Exception("Failed to find stream info")
         self.video_stream = self._find_stream(libav.AVMEDIA_TYPE_VIDEO)
         if self.video_stream is None:
+            libav.format_close_input(self._context)
             raise Exception("Failed to find a video stream")
         self.audio_stream = self._find_stream(libav.AVMEDIA_TYPE_AUDIO)
         if self.audio_stream is None:
+            libav.format_close_input(self._context)
             raise Exception("Failed to find an audio stream")
 
-    @property
-    def nb_streams(self):
-        if not self._context:
-            return 0
-        return self._context.contents.nb_streams
+    def __del__(self):
+        if self._context:
+            libav.format_close_input(self._context)
 
     def _find_stream(self, type):
         index, codec_ref = libav.format_find_best_stream(self._context, type)
@@ -52,6 +52,12 @@ class Demuxer:
         parameters = self._context.contents.streams[index].contents.codecpar
         return Stream(index, Codec(codec_ref), parameters)
 
+    @property
+    def nb_streams(self):
+        if not self._context:
+            return 0
+        return self._context.contents.nb_streams
+
     def read_packet(self):
         if not self._context:
             return None
@@ -60,7 +66,3 @@ class Demuxer:
         if errcode < 0:
             return None
         return packet
-
-    def close(self):
-        if self._context:
-            libav.format_close_input(self._context)