subtiles_adaption_set = ET.SubElement(period, 'AdaptationSet',
lang=text_track['bcp47'],
contentType='text',
- mimeType='text/vtt')
+ mimeType='text/ttml')
for downloadable in text_track['downloadables']:
rep = ET.SubElement(subtiles_adaption_set, 'Representation',
bandwidth='0',