ffmpeg mpeg2 2-pass encoding parameters

ffmpeg -i current/input.avi \
    -vcodec mpeg2video -strict strict -profile:v 4 -level:v 8 \
    -pass 1 \
    -b:v 4800k -maxrate 8700k -minrate 0 -bufsize 1835k \
    -g 15 -bf 2 \
    -b_strategy 2 -brd_scale 0 -b_sensitivity 40 \
    -qmin 1 -qmax 28 -qdiff 3 -dc 10 -non_linear_quant 1 \
    -luma_elim_threshold -4 -chroma_elim_threshold 7 \
    -qcomp 0.6 -qblur 0.5 -rc_strategy 0 \
    -lmin 59 -lmax 3658 \
    -i_qfactor -0.8 -i_qoffset 0 -ibias 96 -pbias 0 \
    -b_qfactor -4 -b_qoffset 1.25 \
    -sc_threshold 0 \
    -me_method dia -me_range 0 -dia_size 6 -pre_dia_size 6 \
    -preme 1 -bidir_refine 4 -mv0_threshold 256 \
    -mbd rd -cmp 2 -subcmp 2 -mbcmp 2 -precmp 2 -skipcmp 2 \
    -nr 0 \
    -aspect 16/9 -threads 2 \
    -f dvd \
    -passlogfile current/ffm48dcqm-nlqs-dz-basic-goprc1-me8-mc4-rc4 \
    /dev/null -y && \
ffmpeg -i current/input.avi \
    -vcodec mpeg2video -strict strict -profile:v 4 -level:v 8 \
    -pass 2
    -b:v 4800k -maxrate 8700k -minrate 0 -bufsize 1835k \
    -g 15 -bf 2 \
    -qmin 1 -qmax 28 -qdiff 3 -dc 10 -non_linear_quant 1 \
    -luma_elim_threshold -4 -chroma_elim_threshold 7 \
    -qcomp 0.6 -qblur 0.5 -rc_strategy 0 \
    -lmin 59 -lmax 3658 \
    -i_qfactor -0.8 -i_qoffset 0 -ibias 96 -pbias 0 \
    -b_qfactor -4 -b_qoffset 1.25 \
    -sc_threshold 0 \
    -me_method dia -me_range 0 -dia_size 6 -pre_dia_size 6 \
    -preme 1 -bidir_refine 4 -mv0_threshold 256 \
    -mbd rd -cmp 2 -subcmp 2 -mbcmp 2 -precmp 2 -skipcmp 2 \
    -nr 0 \
    -aspect 16/9 -threads 2 \
    -f dvd \
    -passlogfile current/ffm48dcqm-nlqs-dz-basic-goprc1-me8-mc4-rc4 \
    current/ffm48dcqm-nlqs-dz-basic-goprc1-me8-mc4-rc4.vob -y