ignore audio language if stream length does not match

ox/file.py

@@ -190,6 +190,7 @@ def avinfo(filename, cached=True):
                 p = subprocess.Popen([ffmpeg, '-i', filename], stdout=subprocess.PIPE, stderr=subprocess.PIPE)
                 stdout, stderr = p.communicate()
                 languages = [re.compile('\((.+?)\):').findall(l) for l in stderr.split('\n') if 'Stream' in l and 'Audio' in l]
+                if len(languages) == len(info['audio']):
                     for i, stream in enumerate(info['audio']):
                         language = languages[i]
                         if language and language[0] != 'und':