s->alpha &= !!(pixdesc->flags & AV_PIX_FMT_FLAG_ALPHA);
s->is_packed_rgb = ff_fill_rgba_map(s->rgba_map, inlink->format) >= 0;
s->alpha &= !!(pixdesc->flags & AV_PIX_FMT_FLAG_ALPHA);
s->is_packed_rgb = ff_fill_rgba_map(s->rgba_map, inlink->format) >= 0;