Question: how many channels of audio can spdif carry
[{'answer': 'two', 'provenance': [{'wikipedia_id': '150049', 'title': 'S/PDIF', 'start_paragraph_id': 2, 'start_character': 68, 'end_paragraph_id': 2, 'end_character': 71, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '150049', 'title': 'S/PDIF', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 245, 'bleu_score': 0.537977810504781, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 13632627801015143514}, 'section': 'Section::::Abstract.'}]}]