+ skip_bits(&s->gb,24);//time_code
+ /* old sample clips were all progressive and no low_delay,
+ bump stream revision if detected otherwise */
+ if (s->low_delay || !(show_bits(&s->gb,9) & 1))
+ h->stream_revision = 1;
+ /* similarly test top_field_first and repeat_first_field */
+ else if(show_bits(&s->gb,11) & 3)
+ h->stream_revision = 1;
+ if(h->stream_revision > 0)
+ skip_bits(&s->gb,1); //marker_bit