Most of these dependencies should be installed automatically when you install official packages.
Unless otherwise stated, the dependencies are all optional.

Core Dependencies

Those are required for almost every component. | Project | Source Download Link | Purpose | Client or Server | Notes | |———|———————-|———|——————|:——| |glib|https://ftp.gnome.org/pub/gnome/sources/glib/|low-level library|both|Required| |gtk|http://ftp.gnome.org/pub/gnome/sources/gtk+/|UI Toolkit|both|Required| |pyopengl|https://pypi.python.org/pypi/PyOpenGL and
https://pypi.python.org/pypi/PyOpenGL-accelerate|client OpenGL accelerated rendering|client| | |pycups|https://pypi.org/project/pycups/)|Printing|both| |


Network Layer

Project Source Download Link Purpose Client or Server Notes
rencode https://pypi.python.org/pypi/rencode/ packet encoding both Recommended
pyyaml https://pypi.python.org/pypi/PyYAML/ alternative packet encoder both optional (usually unused)
lz4 https://github.com/lz4/lz4/releases packet compression both Recommended
python-lz4 https://github.com/python-lz4/python-lz4 python wrapper for lz4 both Recommended
lzo http://www.oberhumer.com/opensource/lzo/#download packet compression both optional - deprecated (usually unused as lz4 is better) - win32 build, see #1044
python-lzo https://pypi.org/project/python-lzo/ python wrapper for lzo both optional
python-cryptography https://pypi.python.org/pypi/cryptography Encryption both
python-zeroconf https://pypi.org/project/zeroconf/ Multicast DNS session publishing server
python-netifaces https://pypi.python.org/pypi/netifaces Multicast DNS session publishing server
dbus-python https://dbus.freedesktop.org/releases/dbus-python/ desktop integration, server control interface both not applicable to MS Windows or Mac OSX
openssl https://www.openssl.org/source/ SSL both
paramiko https://pypi.org/project/paramiko/ ssh integration both
sshpass https://sourceforge.net/projects/sshpass/files/sshpass/ non-interactive SSH password authentication usually client
brotli https://github.com/google/brotli/releases HTML client compression r15540


Authentication

Project Source Download Link Purpose Client or Server Notes
python-gssapi https://pypi.org/project/python-gssapi GSSAPI server #1691
python-kerberos https://pypi.org/project/kerberos/ Kerberos server #1691
python-ldap https://pypi.org/project/python-ldap/ LDAP server #1691
python-ldap3 https://pypi.org/project/ldap3/ LDAP v3 server #1691
pyu2f https://pypi.org/project/pyu2f/ U2F server #1789


Python modules

Project Source Download Link Notes
python-ipaddress https://pypi.org/project/ipaddress/ unspecified: r11859
python-idna https://pypi.org/project/idna/ unspecified: r11860
python-decorator https://pypi.org/project/decorator/ required by gssapi: r18781
pytest-runner https://pypi.org/project/pytest-runner/ required by python-lz4: r17864
python-deprecation https://pypi.org/project/deprecation/ required by python-lz4: r17749
python-pkgconfig https://pypi.org/project/pkgconfig/ required by python-lz4: r17748
python-setuptools-scm https://pypi.org/project/setuptools-scm/ required by python-lz4: r15282
nose https://pypi.org/project/nose/] required by python-lz4: r8676
pyasn1 https://pypi.org/project/pyasn1/] unspecified: r5829
asn1crypto https://pypi.org/project/asn1crypto/ required by python-cryptography: r17856
python-packaging https://pypi.org/project/packaging/ required by python-cryptography: r15310
pyparsing https://pypi.org/project/pyparsing/ required by python-cryptography: r15310
cffi https://pypi.org/project/cffi/ required by python-cryptography: r11633
six https://pypi.org/project/six/ required by python-cryptography: r11640
enum-compat https://pypi.org/project/enum-compat/ required by zeroconf: r20441
enum34 https://pypi.org/project/enum34/ required by enum-compat: r15397
setuptools https://pypi.org/project/setuptools/ unspecified: r5829
pycparser https://pypi.org/project/pycparser/ required by cffi: r11634
pynacl https://pypi.org/project/PyNaCl/ crypto library used by paramiko: r19967
bcrypt https://pypi.org/project/bcrypt/ crypto library used by paramiko: r19965


Encodings

Project Source Download Link Purpose Client or Server
x264 ftp://ftp.videolan.org/pub/x264/snapshots/ h264 encoding server
ffmpeg http://ffmpeg.org/releases/ h264, h265, vp8 and vp9 decoding client
vpx http://downloads.webmproject.org/releases/webm/index.html vp8 and vp9 codec both
webp http://downloads.webmproject.org/releases/webp/index.html webp codec both
libpng ftp://ftp.simplesystems.org/pub/libpng/png/src/libpng16/ png encoding both
libjpeg-turbo https://sourceforge.net/projects/libjpeg-turbo/files/ jpeg encoding both
python-pillow https://pypi.python.org/pypi/Pillow png,jpeg,webp encoding and decoding, format conversion - Required both
opencv http://opencv.org/downloads.html Webcam capture] client
libyuv https://chromium.googlesource.com/libyuv/libyuv/ Colourspace Conversion both
pycuda https://pypi.python.org/pypi/pycuda NVENC server
cuda https://developer.nvidia.com/cuda-toolkit NVENC server
pyNVML https://pypi.python.org/pypi/nvidia-ml-py/ NVENC server


Audio Forwarding

Project Source Download Link Purpose
gstreamer http://gstreamer.freedesktop.org/src/ audio framework
Ogg http://downloads.xiph.org/releases/ogg/ ogg container format
opus http://downloads.xiph.org/releases/opus/ opus codec
Flac http://downloads.xiph.org/releases/flac/ flac codec
Speex http://downloads.xiph.org/releases/speex/ speex codec
Vorbis http://downloads.xiph.org/releases/vorbis/ vorbis codec
wavpack http://www.wavpack.com/downloads.html wavpack codec
faac http://faac.sourceforge.net/ aac encoder
faad http://faac.sourceforge.net/ aac decoder
lame http://sourceforge.net/projects/lame/files/lame/ MP3 encoder
TwoLame http://sourceforge.net/projects/twolame/files/twolame/ MP3 encoder
Mad http://sourceforge.net/projects/mad/files/libmad/ MP3 decoder