Send data via UPD or TCP without Netcat on Linux/Mac

- 1 min read

I only just found out about this…

# Send data via TCP to host 127.0.0.1 port 12201
echo "hello" >/dev/tcp/127.0.0.1/12201

# Send data via UDP to host 127.0.0.1 port 12201
echo "hello" >/dev/udp/127.0.0.1/12201

Now is there a way to listen via the same /dev/tcp|udp end point?

Rebuilding FFmpeg with NVENC and AAC on Ubuntu

- 2 mins read

This mini guide will show you how to rebuild the exact version of FFmpeg that comes with your version of Ubuntu and just add support for NVidia GPU encoding via the NVENC API and ACC via libfdk_aac.


# Download and unzip the NVIDIA Video Codec SDK from https://developer.nvidia.com/nvidia-video-codec-sdk
wget https://developer.nvidia.com/video-sdk-601
unzip nvidia_video_sdk_6.0.1.zip

# Copy the headers files from the SDK so FFmpeg can find them
sudo cp nvidia_video_sdk_6.0.1/Samples/common/inc/*.h /usr/local/include/

# Make sure "Source code" is enabled in System Settings... -> Software & Updates
# Download the build dependencies for FFmpeg
sudo apt-get build-dep ffmpeg

# Install libfdk_aac
sudo apt-get install libfdk-aac-dev

# Download the source for the exact version of FFmpeg you already have installed (not as root)
apt-get source ffmpeg

# Go into the ffmpeg source you just downloaded
cd ffmpeg-2.8.6

# Find out the exact command the ffmpeg was originally built with
ffmpeg -buildconf

# Copy the single line "configuration:" and pass it to ".configure" but add "--enable-nonfree --enable-nvenc --enable-libfdk-aac" on the end
# Mine looks like this:
./configure --prefix=/usr --extra-version=1ubuntu2 --build-suffix=-ffmpeg --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --cc=cc --cxx=g++ --enable-gpl --enable-shared --disable-stripping --disable-decoder=libopenjpeg --disable-decoder=libschroedinger --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmodplug --enable-libmp3lame --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-librtmp --enable-libschroedinger --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxvid --enable-libzvbi --enable-openal --enable-opengl --enable-x11grab --enable-libdc1394 --enable-libiec61883 --enable-libzmq --enable-frei0r --enable-libx264 --enable-libopencv --enable-nonfree --enable-nvenc --enable-libfdk-aac

# Now build it
make

# And finally install it over the original
sudo make install

Linking Nvidia GPU temperature with a motherboard PWM fan in Linux

- 2 mins read

So I have a closed loop water cooler on my GPU and I replaced the stock single speed fan with two Noctua PWM fans (doing push/pull) connected to my motherboard. Even though the fans can be seen by lm_sensors and fancontrol the Nvidia GPU does not appear as it’s proprietary driver.

I knew nvidia-settings could be used to query the temperature (and the pump speed if you care) so I wrote a script to tie it all together:

Read More…

GitFlow hmmmm

- 2 mins read

After reading Atlassian worflow comparison and Vincent Driessen original post about GitFlow I have come to realise a couple of worrying things:

  • I incorrectly assumed GitFlow was the same thing as GitHub flow (fork project, do work then pull request)

  • This model appears to be popular but it seems totally archaic to me

    • Requires lots of merging especially if you refactor at lot.
    • Doesn’t do CD
    • Requires lots of manual work
    • Master and develop seem the wrong way around to me
    • How many branches?

  • I use pull requests but don’t use feature branches which the Atlassian article implies requires feature branches

    Read More…