The decoder has mismatches for the following case: two PPSs are signalled in the bitstream, pps_curr_pic_ref_enabled_flag are set to false and true in the first and second PPS, respectively, and the first few frames are coded referring to the first PPS and remaining frames are coded referring to the second PPS. In the current SCM, when a frame referring to the second PPS starts to be decoded(the variable m_pcTwoVersionsOfCurrDecPicFlag is set from false to true), the reconstructed frame before loop filtering(e.g. deblocking/SAO) should be removed after decoding the current frame. However, in the current SCM, a frame is removed when the m_bCurPic flag and the m_bIsLongTerm flag are true and false respectively. When the decoder performs the removal, the first frame in the current picture list, a frame decoded referring to the first SPS, will be undesirably removed instead of the current picture before being filtered, which results in errors on constructing the reference frame list when decoding of the successive frames. And, the encoder works well.