h264parse: try harder to update timecode
NumClockTS is the maximum number of timecodes the pic_timing SEI can carry, but it is perfectly OK for it to carry fewer, and have one of the clock_timestamp_flags set to 0.
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NumClockTS is the maximum number of timecodes the pic_timing SEI can carry, but it is perfectly OK for it to carry fewer, and have one of the clock_timestamp_flags set to 0.