free_format_flag [MPEG-2 Semantics]
free_format_flag is a 1-bit boolean field that, when set, indicates that the audio stream may contain one or more audio frames with the bitrate_index set to '0000.' If this field is set to '0;, then the bit_rate index is not equal to '0000.'
This field and the MPEG-2 audio_stream_descriptor are not useful in ATSC transport streams, which use a different digital audio technique.
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