parse language from audio track if video has multiple audio tracks

ox/file.py

@@ -177,6 +177,15 @@ def avinfo(filename, cached=True):
                 if not 'display_aspect_ratio' in v and 'width' in v:
                     v['display_aspect_ratio'] = '%d:%d' % (v['width'], v['height'])
                     v['pixel_aspect_ratio'] = '1:1'
+        if len(info.get('audio', [])) > 1:
+            ffmpeg = cmd('ffmpeg')
+            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]
+            for i, stream in enumerate(info['audio']):
+                language = languages[i]
+                if language and language[0] != 'und':
+                    stream['language'] = language[0]
         return info
 
     return {'path': filename, 'size': 0}