Created
May 26, 2019 22:52
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VoxCeleb2 m4a to wav converter
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# copy this to root directory of data and | |
# chmod a+x convert.sh | |
# ./convert.sh | |
# https://unix.stackexchange.com/questions/103920/parallelize-a-bash-for-loop | |
open_sem(){ | |
mkfifo pipe-$$ | |
exec 3<>pipe-$$ | |
rm pipe-$$ | |
local i=$1 | |
for((;i>0;i--)); do | |
printf %s 000 >&3 | |
done | |
} | |
run_with_lock(){ | |
local x | |
read -u 3 -n 3 x && ((0==x)) || exit $x | |
( | |
( "$@"; ) | |
printf '%.3d' $? >&3 | |
)& | |
} | |
N=32 # number of vCPU | |
open_sem $N | |
for f in $(find . -name "*.m4a"); do | |
run_with_lock ffmpeg -loglevel panic -i "$f" -ar 16000 "${f%.*}.wav" | |
done |
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