If you have an Annex B stream, it is very likely that this is part of the trailing bits at the end of the NALU (so that it ends at a whole byte position). If present, it consists of a one bit, followed by as many zero bits as needed to reach a whole byte position. For further information, see 7.4.1, syntax element "rbsp_byte[ i ]", the paragraphs belonging to "rbsp_trailing_bits( )", especially:
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Originally Posted by H.264
ii) The next bit consists of a single rbsp_stop_one_bit equal to 1.
iii) When the rbsp_stop_one_bit is not the last bit of a byte-aligned byte, one or more
rbsp_alignment_zero_bit is present to result in byte alignment.
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