How to Convert FLAC+CUE to MP3

Converting flac to mp3 package pre-requirements are the same as published in previous post (How to Convert APE+CUE to MP3). So I will add what is necessary. You will need flac package.

apt-get -y install flac

Here is a script that does the rest (file flac-mp3.sh):

#!/bin/sh

# Convert FLAC to MP3 VBR
flac -cd CDImage.flac | lame -h - -v \
    --preset cd CDImage.mp3

# Split file
mp3splt -a -d mp3 -c CDImage.flac.cue -o \
    @a/@b/@n-@a-@t CDImage.mp3
rm CDImage.mp3

Drop that file into a directory that has two files input CDImage.flac and CDImage.flac.cue. Run the script and in few minutes you will get a mp3 directory with your mp3 tracks.

How to Convert APE+CUE to MP3

There is no a single tool to convert a APE file to a number of mp3 tracks. We are going to convert ape file to wav first, than wav to mp3 (a single file) and finally cut a single mp3 file into several (per CUE file). We need several packages. Two of them (libmac2 monkey-audio) are from debian-multimedia, choose mirror from the following list. You need to install debian-multimedia-keyring package. In my case I have obtained it from here:

http://mirror.yandex.ru/debian-multimedia/pool/main/d/deb-multimedia-keyring/

Download debian-multimedia-keyring_2010.12.26_all.deb file (in your case the file can be newer) and install:

dpkg -i debian-multimedia-keyring_2010.12.26_all.deb

Once above is done we need to add debian-multimedia repository location to apt source list and update it:

echo "deb http://mirror.yandex.ru/debian-multimedia/ testing main non-free" \
    >> /etc/apt/sources.list
apt-get update

Install required packages:

apt-get -y install libmac2 monkeys-audio shntool \
    lame mp3splt

Here is a script that does the rest (file ape-mp3.sh):

#!/bin/sh

# Convert APE to WAV
shnconv -o wav CDImage.ape
# Convert WAV to MP3 VBR
lame -h -v --preset cd CDImage.wav CDImage.mp3
rm CDImage.wav
# Split file
mp3splt -a -d mp3 -c CDImage.ape.cue -o \
    @a/@b/@n-@a-@t CDImage.mp3
rm CDImage.mp3

Drop that file into a directory that has two files input CDImage.ape and CDImage.ape.cue. Run the script and in few minutes you will get a mp3 directory with your tracks.

Troubleshooting: mp3splt does not set ID3 tags

As of this writing Debian testing comes with mp3splt version 2.2.5-1. The problem has been fixed since version 2.3. So in order to install latest version you need to add the following to /etc/apt/sources.list:

echo "deb http://mp3splt.sourceforge.net/repository wheezy main" \
    >> /etc/apt/sources.list
apt-get update

Note that you need remove previously installed packages related to mp3splt:

apt-get remove libmp3splt-mp3 libmp3splt-ogg \
    libmp3splt0 mp3splt

Install latest:

apt-get install libmp3splt0-mp3 libmp3splt0-ogg \
    libmp3splt0 mp3splt

How to share network connection with iptables

While working in isolated environment you might need to share your machine internet connection with other computers or virtual machines (e.g. host only network in VirtualBox). Ensure you have iptables installed.

apt-get install iptables

There are two thing we need to do: let kernel know that it is permitted to forward network traffic.

echo "sysctl net.ipv4.ip_forward=1" >> \
    /etc/sysctl.d/ip_forward.conf

and apply masquerading for the interface that we what to share (eth0), add the following line to /etc/rc.local:

iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE

You have to restart your computer so the changes take place during the next system boot.

How to rewrite all to https in nginx

Here we are going redirect all http traffic to https with nginx. I suppose you already have nginx installed, if not have a look here. We will store SSL certificates in /etc/nginx/ssl directory.

cd /etc/nginx
mkdir ssl
openssl req -new -x509 -sha256 -days 9999 -nodes \
    -out ssl/cert.pem -keyout ssl/cert.key
chown -R www-data:www-data ssl
chmod -R 700 ssl

Here is nginx configuration:

upstream backend {
    server 127.0.0.1:8080;
}

server {
    listen  *:80;
    return 301 https://$host$request_uri;
    #if ( $scheme = "http" ) {
    #    rewrite  ^/(.*)$  https://$host/$1 permanent;
    #}
}

server {
    listen  *:443;

    ssl on;
    ssl_protocols TLSv1;
    ssl_certificate /etc/nginx/ssl/cert.pem;
    ssl_certificate_key /etc/nginx/ssl/cert.key;

    location / {
        proxy_pass http://backend;
    }
}

You have to reload nginx so the changes take place.

Building Python EGGs in Batch

While working with different versions of python you deal with libraries that comes with source code and doesn't provide a compiled python egg file.

Method1: Offline

Here is a script that develops eggs per python version you have installed for all packages found in lib directory (you must create that directory at the same place where the script below and drop downloaded source distribution archives in).

#!/bin/sh

rm -rf eggs
mkdir eggs
for p in /usr/local/bin/python?.?
do
    echo -n $p
    rm -rf env/
    virtualenv --no-site-packages --python=$p -q env > /dev/null 2>/dev/null
    echo -n .
    env/bin/easy_install -i lib -U -O2 -z distribute > /dev/null 2>/dev/null
    for f in lib/*  # packages to build
    do
        echo -n .
        env/bin/easy_install -i lib -O2 -z $f > /dev/null 2>/dev/null
    done
    cp env/lib/python*.*/site-packages/*.egg eggs/ 2>/dev/null
    echo done
done
rm -rf env/
rm -f eggs/setuptools* eggs/distribute*

Run script with:

./sh make_eggs.sh

Python eggs are now in eggs directory.

Method2: Online

In this case the script relies on internet connection and downloads sources right from pypi.

#!/bin/sh

rm -rf eggs
mkdir eggs
for p in /usr/local/bin/python?.?
do
    echo -n $p
    rm -rf env/
    virtualenv --no-site-packages --python=$p -q env > /dev/null 2>/dev/null
    echo -n .
    env/bin/easy_install -U -O2 -z distribute > /dev/null 2>/dev/null
    for f in $@
    do
        echo -n .
        env/bin/easy_install -O2 -z $f > /dev/null 2>/dev/null
    done
    cp env/lib/python*.*/site-packages/*.egg eggs/ 2>/dev/null
    echo done
done
rm -rf env/
rm -f eggs/setuptools* eggs/distribute*

Run script by passing packages you want to build:

./sh make_eggs.sh pycrypto lxml

Python eggs are now in eggs directory.