how to improve quality with ffmpeg flv [closed]

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i'm haveing problem when converting movies to FLV, i get a lot of small squares in the picture. maybe someone know why? and how i can remove those squares and make picture better? my code is:

ffmpeg -i movie.mp4 -f mpegts -acodec libmp3lame -ar 48000 -ab 128k -s 320.240 -vcodec libx264 -b 320k -flags +loop -cmp +chroma -partitions +parti4x4+partp8x8+partb8x8 -subq 7 -trellis 1 -refs 1 -coder 0 -me_range 16 -keyint_min 25 -sc_threshold 40 -i_qfactor 0.71 -bt 200k -maxrate 10M -bufsize 10M -rc_eq 'blurCplx^(1-qComp)' -qcomp 0.6 -qmin 10 -qmax 51 -qdiff 4 -level 30 -g 30 -async 2 out.flv

thanks!

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i'm not noticing a -vpre setting, in which you set the encoding speed, and a dozen various other quality options. Slower speeds = better quality but longer encode time.

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I'm sorry. my bad my code is:

ffmpeg -i in.mp4 -r 20 -ar 44100 -ab 60 -b 1600k -maxrate 10M -bufsize 10M -qcomp 0.6 -qmin 10 -qmax 51 -qdiff 4 -level 30 -f flv out.flv