atscmux: fix AC-3 stream id
According to ATSC A/52, Annex A, section 4.2:
The value of stream_id in the PES header shall be 0xBD (indicating private_stream_1)
Edited by Mathieu Duponchelle
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According to ATSC A/52, Annex A, section 4.2:
The value of stream_id in the PES header shall be 0xBD (indicating private_stream_1)