MTC_SEC
mtc->delta += delta * MTC_SEC;
qfrlen = mtc->dev->rate * (MTC_SEC / (4 * mtc->fps));
mtc->delta = -MTC_SEC * (int)mtc->dev->bufsz;
mtc->hr = (mtc->origin / (MTC_SEC * 3600)) % 24;
mtc->min = (mtc->origin / (MTC_SEC * 60)) % 60;
mtc->sec = (mtc->origin / (MTC_SEC)) % 60;
mtc->fr = (mtc->origin / (MTC_SEC / fps)) % fps;
(x->u.loc.hr & 0x1f) * 3600 * MTC_SEC +
x->u.loc.min * 60 * MTC_SEC +
x->u.loc.sec * MTC_SEC +
x->u.loc.fr * (MTC_SEC / fps));