opensourcetutor.com

High Quality – File size ends up being larger than the M4V
for i in *.m4v;do ffmpeg -i $i -ar 22050 -qscale .1 ${i%.*}.flv;done
Quality is almost indiscernible from the original M4V in a laptop
for i in *.m4v;do ffmpeg -i $i -ar 22050 -ab 96k -qscale 2 ${i%.*}.flv;done
Slight degradation in quality. File size approx. 35% less than the original m4v.
for i in *.m4v;do ffmpeg -i $i -ar 22050 -ab 96k -qscale 5 ${i%.*}.flv;done

Debug core dump files:
gdb /usr/bin/php5 /path/to/core.3224
Mass delete core dump files safely.
find . -type f -regex “.*/core\.[0-9]*$” -exec rm -v {} \;
Disable Core dumps system wide