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hb_fifo_t * ivtc_fifo;pv->ivtc_fifo = hb_fifo_init( 4 );hb_fifo_close( ivtc_fifo );/* Set output to render buffer */(*buf_out) = buf_render;if( buf_tmp_in == NULL ){    /* Teardown and cleanup buffers if we are emitting NULL */    if( buf_in && *buf_in )    {        hb_buffer_close( buf_in );        *buf_in = NULL;    }            if( buf_out && *buf_out )    {        hb_buffer_close( buf_out );                *buf_out = NULL;    }}else if( buf_tmp_in != buf_render ){        /* Copy temporary results and settings into render buffer */    memcpy( buf_render->data, buf_tmp_in->data, buf_render->size );    hb_buffer_copy_settings( buf_render, buf_tmp_in );    hb_fifo_push( pv->ivtc_fifo, buf_render );    }if ( hb_fifo_is_full( pv->ivtc_fifo ) ){    buf_render = hb_fifo_get( pv->ivtc_fifo );        /* Pass VFR NTSC IVTC frame durations on through the workflow.       I totally wish I could slip some cryptic abbreviations into       the last sentence.                                                        (90090000 / 120000) is the rational equivalent of 750.75.       That's the number of ticks by which a 23.976 frame is        longer than a 29.97 frame. God I hate fractions.    */         if ( (dropped_frames) &&( dropped_frames * 4 ) > extended_durations )     {         buf_render->stop = buf_render->stop + (90090000 / 120000);         extended_durations++;     }     else if (buf_render->flags & 16)     {         //buf_render->stop = buf_render->stop + (90090000 / 120000);     }}else{    hb_buffer_close( buf_out );    *buf_out = NULL;}