avconv -thread_type frame -threads 0 -i test1.mov -y \
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-s 1280x720 -vcodec libx264  -b 2500k -maxrate 3700k -bufsize 1M -refs 2 -coder 0 -bf 0 -flags +loop+cgop -flags2 +sgop -cmp +chroma -deblockalpha 0 -deblockbeta 0  -me_method umh -me_range 16 -subq 7 -partitions +parti4x4+parti8x8+partp8x8 -g 189 -keyint_min 24 -level 31 -qmin 8 -qmax 51 -qcomp 0.6 -trellis 0 -sc_threshold 40 -i_qfactor 0.71 -an  -passlogfile 720p -pass 1 -wpredp 1 2500k_720p.mp4 \
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-s 800x448 -vcodec libx264 -b 1200k -maxrate 1600k -bufsize 512k -refs 4 -coder 0 -bf 0 -flags +loop+cgop -flags2 +sgop -cmp +chroma -deblockalpha 0 -deblockbeta 0  -me_method umh -me_range 16 -subq 7 -partitions +parti4x4+parti8x8+partp8x8 -g 189 -keyint_min 24 -level 31 -qmin 8 -qmax 51 -qcomp 0.6 -trellis 0 -sc_threshold 40 -i_qfactor 0.71 -an -passlogfile 448p -pass 1 1200k_SD.mp4 \
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-s 1920x1080 -vcodec libx264 -b 5750k -maxrate 8200k -bufsize 2M -refs 2 -coder 1 -bf 4 -flags +loop+cgop -flags2 +sgop -cmp +chroma -deblockalpha 0 -deblockbeta 0  -me_method umh -me_range 16 -subq 7 -partitions +parti4x4+parti8x8+partp8x8 -g 290 -keyint_min 2 -level 31 -qmin 8 -qmax 51 -qcomp 0.6 -trellis 2 -sc_threshold 40 -i_qfactor 0.71 -an -passlogfile 1080 -pass 1 5700k_1080p.mp4 \
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-s 640x360 -vcodec libx264 -b 750k -maxrate 1300k -bufsize 512k -refs 4 -coder 0 -bf 0 -flags +loop+cgop -flags2 +sgop -cmp +chroma -deblockalpha 0 -deblockbeta 0  -me_method umh -me_range 16 -subq 7 -partitions +parti4x4+parti8x8+partp8x8 -g 189 -keyint_min 24 -level 31 -qmin 8 -qmax 51 -qcomp 0.6 -trellis 0 -sc_threshold 40 -i_qfactor 0.71 -an  -passlogfile 360p -pass 1 750k_SD.mp4