Auto Convert PCM File to MP3?

[chebro]

Since FFmpeg is a dependency is it possible to convert the output file to MP3 format? Will be easier to manage, thanks!

[radiantly]

On the commandline this can be done using ffmpeg -f s16le -ar 44.1k -ac 2 -i file.pcm file.mp3

[chebro]

Thanks! I guess that solves it for now. Closing the issue.

[shelomito12]

Here are 2 shells you can use in Linux

Things you need:

1. pm2 (installation is global):

sudo npm install pm2@latest -g

2. pm2 log-rotate (optional/recommended):

pm2 install pm2-logrotate

Note: I think it's better if you install it from the app root directory but it may not be necessary

3. Create a new directory inside the app root directory and name it mp3

4. This script https://raw.githubusercontent.com/ChaoticWeg/discord.sh/master/discord.sh to send the mp3 via Webhook to your channel (optional)

How to run

If you have the bot running, stop it and restart it with:

pm2 start index.js --name DVRBot --time

Note: Here DVRBot is the chosen name for your app/bot in the pm2 list of processes. You can name it whatever you like.

pm2 will create a log file. You can tail it using:

tail -f -n 100 /home/<user>/.pm2/logs/DVRBot-out.log

Once you have the bot online in Discord, then proceed below

Script 1:

Note 1: Change directory paths accordingly.
Note 2: You can create a dedicated Webhook from your Discord server that will be used by the script for sending the mp3 file at the end of the process.

#!/bin/bash

APP_DIR="/home/ubuntu/discord-voice-recorder"
REC="$APP_DIR/recordings"
MP3="$APP_DIR/mp3"
LOG="/home/ubuntu/.pm2/logs/DVRBot-out.log"
WEBHOOK="https://discord.com/api/webhooks/<YOUR_WEBHOOK_HERE>"

printdate() {
    gawk '{ print strftime("%Y-%m-%d %T:"), $0 }'
}

while read LOGLINE
do

        echo " "
        echo "recording stopped" | printdate >>$LOG
        echo $LOGLINE
        if [ "$(ls -A $REC)" ]; then
                echo "items found! directory $REC is not empty!"
        else
                echo "nothing! directory $REC is empty!"
                break
        fi

        echo " "
        echo "starting new merge of audio files in $REC..." | printdate >>$LOG
        node $APP_DIR/bin/merge.js
        wait
        sleep 5
        echo " "
        echo "ffmpeg will now convert pcm to mp3... " | printdate >>$LOG
        echo " "
        DATE=$(date "+%Y-%m-%dT%H.%M.%2N")
        ffmpeg -f s16le -ar 48000 -ac 2 -i $REC/merge.pcm $MP3/recording-$DATE.mp3
        wait
        wait
        sleep 5
        echo "conversion complete!" | printdate >>$LOG
        echo " "
        echo "sending mp3 to discord channel #general..."
        echo " "
        $APP_DIR/discord.sh --webhook-url="$WEBHOOK" --file $MP3/recording-$DATE.mp3 --username "My Bot" --text "Hey boss, here's the recording in mp3 format!"
        wait
        echo " "
        echo "removing old pcm files from $REC..."
        rm -f $REC/*
        echo " "
        echo "showing $MP3 directory:"
        echo " "
        ls -ltr $MP3
        echo " "
        break

done < <(tail -F -n 0 $LOG | grep --line-buffered "STOPPED RECORDING")
KILL_TAIL=`ps -ef | awk '/tail.*DVRBot-out.log/ && !/awk/ {print $2}'`
kill -9 $KILL_TAIL
wait
pkill -f monitor_stop_rec.sh
wait

Once you have created script 1, run it "manually" from the app root directory:

./script1.sh

Record something from Discord and monitor the script to make sure there are no errors.

Script 2:

Note: Change directory paths accordingly.

#!/bin/bash

# > /dev/null 2>&1

MAIN_DIR="/home/ubuntu/discord-voice-recorder"
SCRIPT="$MAIN_DIR/monitor_stop_rec.sh" #this is script 1 file name (from above)
DATE=`date +"%Y-%m-%d %T:"`
VOICEREC_PROC=`pgrep -f $MAIN_DIR/monitor_stop_rec.sh`

if [ -n "$VOICEREC_PROC" ]
        then
                echo "$DATE Success! discord voice recorder process is currently running!"
                exit 0
        else
                echo "$DATE Warning! discord voice recorder process is not running. starting now..."
                nohup $SCRIPT &

fi

Set a Cron job for Script 2:

Once you have created the above scripts, and have tested script 1 is working properly, then just create the following cron job which will start the process automatically:

# on every minute, will check if discord-voice-recorder process is down, if it is then it will bring it up
* * * * * /bin/bash /home/ubuntu/discord-voice-recorder/check_DVRBot_monitor_stop_rec.sh > /dev/null 2>&1

IMPORTANT: Before recording from Discord, you must empty the recordings/ directory. This is only required once, when you start the above process for the first time.

[radiantly]

Quite an interesting solution! Looking through this, I'm wondering if polling to see if the script is running/is recording can be eliminated by watching the recordings directory using inotify or similar.

Maybe even easier, we just call ffmpeg using the child_process module after the bot has done recording 🍷