IPP 7.1 H264 Encoder: Max Slice Size vs. Multithreading

Dear Experts,

Could you please clarify what the following code from H264CoreEncoder_CheckEncoderParameters means? To me it looks like I can either limit slice size to a certain maximum or enabled multiple threads. Is it possible to have both features - "multithreading" and "slice size limit" - enabled simultaneously?

    if(core_enc->m_params.max_slice_size)
    {
        core_enc->m_MaxSliceSize = core_enc->m_params.max_slice_size;
        core_enc->m_params.m_iThreads = 1;
        core_enc->m_params.num_slices = 1;
    }

Thanks,

Sergey.