gpu-screen-recorder/nvidia shadowplay: added

wiki/linux/gpu_screen_recorder.md

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+# GPU Screen Recorder
+
+[GPU Screen Recorder](https://git.dec05eba.com/gpu-screen-recorder/about/) is a
+utility similar to [Nvidia ShadowPlay](/wiki/nvidia.md#screen-capture).
+
+## Setup
+
+GPU Screen Recorder can be installed on some distributions by installing the
+`gpu-screen-recorder-git` package.
+An installation via [git](https://git.dec05eba.com/gpu-screen-recorder/about/)
+is always possible.
+
+## Usage
+
+The program features normal recording of the screen and recording in the so
+called replay mode.
+To start a simple screen recording run the following command.
+
+```sh
+gpu-screen-recorder -w $(xdotool selectwindow) -c mp4 -f 60 -a "$(pactl get-default-sink).monitor" -o test_video.mp4`
+```
+
+The window to record has to be selected first by clicking on it.
+The default audio device is already selected.
+
+To stop the recording `Ctrl-C` the previous command or use the command below.
+
+```sh
+killall -SIGINT gpu-screen-recorder
+```
+
+For the replay mode the recording can be started the following way.
+
+```sh
+gpu-screen-recorder -w $(xdotool selectwindow) -c mp4 -f 60 -a "$(pactl get-default-sink).monitor" -r 30 -o .`
+```
+
+In this case a replay will have the maximum length of 30 seconds (specified by
+`-r 30`).
+It is also important to assign the `-o` flag with a directory and not a file
+anymore.
+The last 30 seconds (replay) can then be sending a SIGUSR1 signal.
+
+```sh
+killall -SIGUSR1 gpu-screen-recorder
+```

wiki/linux/nvidia.md

@@ -1,10 +1,10 @@
-# NVidia
+# Nvidia
 
-NVidia is a vendor for graphics cards.
+[Nvidia](/wiki/nvidia.md) is a vendor for graphics cards.
 
 ## Setup
 
-For NVidia GPUs to work install the `nvidia` and the `nvidia-utils` package.
+For Nvidia GPUs to work install the `nvidia` and the `nvidia-utils` package.
 If you want to easily configure the monitors as described in a later section of
 this file you can also install `nvidia-settings`.
 

wiki/nvidia.md

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+# Nvidia
+
+[Nvidia](https://www.nvidia.com) is a vendor for graphics cards.
+These graphics cards are mainly supported for Windows systems but can be used on
+Linux based systems with some special caveats explained in the
+[Linux Nvidia entry](/wiki/linux/nvidia.md).
+
+### Screen Capture
+
+Nvidias program with several tools - called GeForce Experience - features
+software for hardware-accalerated [screen recordings](/wiki/screen_capture.md).
+This recording software is called Nvidia ShadowPlay.
+Nvidia Experience is currently only available on Windows systems.

wiki/screen_capture.md

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+# Screen Capture
+
+Screen capture describes the process of recording a computer screen.
+
+## Screen Capture options
+
+Windows systems using an Nvidia graphics card can make use of ShadowPlay a
+screen recording software integrated in Nvidias suite GeForce Experience.
+
+Linux systems can use the
+[GPU Screen Recorder](/wiki/linux/gpu_screen_recorder.md) to make
+gpu-accelerated screen recordings.
+It features similar features to ShadowPlay.