|  | @@ -29,7 +29,6 @@ from ..utils import (
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				|  |  |      age_restricted,
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				|  |  |      bug_reports_message,
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				|  |  |      clean_html,
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				|  |  | -    codec2ext,
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				|  |  |      compiled_regex_type,
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				|  |  |      determine_ext,
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				|  |  |      error_to_compat_str,
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				|  | @@ -1448,8 +1447,9 @@ class InfoExtractor(object):
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				|  |  |                          continue
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				|  |  |                      representation_attrib = adaptation_set.attrib.copy()
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				|  |  |                      representation_attrib.update(representation.attrib)
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				|  |  | -                    mime_type = representation_attrib.get('mimeType')
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				|  |  | -                    content_type = mime_type.split('/')[0] if mime_type else representation_attrib.get('contentType')
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				|  |  | +                    # According to page 41 of ISO/IEC 29001-1:2014, @mimeType is mandatory
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				|  |  | +                    mime_type = representation_attrib['mimeType']
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				|  |  | +                    content_type = mime_type.split('/')[0]
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				|  |  |                      if content_type == 'text':
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				|  |  |                          # TODO implement WebVTT downloading
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				|  |  |                          pass
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				|  | @@ -1472,7 +1472,7 @@ class InfoExtractor(object):
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				|  |  |                          f = {
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				|  |  |                              'format_id': '%s-%s' % (mpd_id, representation_id) if mpd_id else representation_id,
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				|  |  |                              'url': base_url,
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				|  |  | -                            'ext': codec2ext(representation_attrib.get('codecs')),
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				|  |  | +                            'ext': mimetype2ext(mime_type),
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				|  |  |                              'width': int_or_none(representation_attrib.get('width')),
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				|  |  |                              'height': int_or_none(representation_attrib.get('height')),
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				|  |  |                              'tbr': int_or_none(representation_attrib.get('bandwidth'), 1000),
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