Unattended podcast recording and processing. http://www.geekytidbits.com/raspberry-pi-unattended-audio-recordings

podcast-record.sh

#!/bin/sh
 
# Unattended podcast record process
# Author: [email protected]
# Notes: Invoke with seconds parameter specifying how many seconds to record, ex. 'podcast-record.sh 10'

FILENAME=$(date +"%Y%m%d_%H%M")

#record with sudo since arecord seems to want root privledges
sudo arecord -f dat -d $1 ./record/${FILENAME}.wav
[ $? -eq 0 ] || exit $?

#change ownership to jdoe
sudo chown jdoe ./record/${FILENAME}.wav
[ $? -eq 0 ] || exit $?

#copy to process directory
cp ./record/${FILENAME}.wav ./process/${FILENAME}.wav

#stereo > mono
sox ./process/${FILENAME}.wav -c 1 ./process/${FILENAME}-mono.wav

#convert to mp3 (64Kpbs) 
lame -b 64 ./process/${FILENAME}-mono.wav ./upload/${FILENAME}.mp3
[ $? -eq 0 ] || exit $?

#remove process files
rm ./record/${FILENAME}.wav
rm ./process/${FILENAME}.wav
rm ./process/${FILENAME}-mono.wav

[email protected]
MODTIME=$(stat -c %y ./upload/${FILENAME}.mp3)
DATE=$(date --date="${MODTIME}" +%Y-%m-%d)

#upload to s3
s3cmd put --reduced-redundancy --acl-public ./upload/${FILENAME}.mp3 s3://MY_S3_BUCKET/${FILENAME}.mp3
[ $? -eq 0 ] || continue

#write db record
mysql -h www.mydomain.com -D MY_DB_NAME -u MY_DB_USERNAME -pMY_DB_PASSWORD --execute "INSERT INTO Lesson (Date, Title, Speaker, Audio_File_Name) VALUES ('${DATE}', 'TBD', 'TBD', '${FILENAME}.mp3')"
[ $? -eq 0 ] || continue

mv ./upload/${FILENAME}.mp3 ./complete/

#send email
echo "Done!" | mail -s "Podcast ${DATE} - Upload Complete" $NOTIFY_EMAIL