GStreamer OBS Studio plugin

1. An OBS Studio source plugin to feed GStreamer launch pipelines into OBS Studio.

This plugin has interesting use cases but may be difficult to understand and is clunky use if you are not familiar with GStreamer.

This may be interesting for people trying to run OBS Studio to different platforms like the RaspberryPi or NVIDIA Tegra.

2. An OBS Studio video filter plugin to use GStreamer pipelines as video filters in OBS Studio.

This may be handy to quickly get some simple filters in but also complex pipelines are possible as long as no rate or dimension changes are done.

3. An OBS Studio audio filter plugin to use GStreamer pipelines as audio filters in OBS Studio.

This may be handy to quickly get some simple filters in but also complex pipelines are possible as long as no rate or dimension changes are done.

Prebuilt

Experimental prebuilt 64-bit Windows plugin is available. You still require the official GStreamer run-time (MinGW version) to be installed. Make sure the run-time bin path is added to Windows's PATH environment.

Experimental prebuilt macOS plugin available. You still require the GStreamer run-time installed via Macports (not Homebrew).

Experimental prebuilt Linux plugin is available. You still require the GStreamer run-time installed via your Linux ditribution's package manager.

Linux plugins can be installed in locations that follow this scheme:

~/.config/obs-studio/plugins/<pluginname>/bin/64bit/<pluginname>.so

For Flatpak use:

flatpak install com.obsproject.Studio.Plugin.Gstreamer

Usage

The source plugin makes use of the GStreamer launch pipeline descriptions. Please refer to the GStreamer documentation to understand what this means:

https://gstreamer.freedesktop.org/documentation/tools/gst-launch.html

This plugins provides two media sinks named video and audio. These are the media sinks that hand over data to OBS Studio. So your pipeline should connect to these sinks.

An example pipeline:

videotestsrc is-live=true ! video/x-raw, framerate=30/1, width=960, height=540 ! video. audiotestsrc wave=ticks is-live=true ! audio/x-raw, channels=2, rate=44100 ! audio.

RTMP example:

uridecodebin uri=rtmp://wowzaec2demo.streamlock.net/vod/mp4:bigbuckbunny_1500.mp4 name=bin ! queue ! video. bin. ! queue ! audio.

RTSP example:

uridecodebin uri=rtsp://wowzaec2demo.streamlock.net/vod/mp4:BigBuckBunny_115k.mov name=bin ! queue ! video. bin. ! queue ! audio.

RTSP example with h265 decoding via Nvidia GPU and MP2L2 audio extraction:

rtspsrc location=rtspt://admin:*****@*****.ath.cx:555/Streaming/Channels/101 name=bin ! queue ! rtph265depay ! nvdec ! gldownload ! watchdog timeout=10000 ! video. bin. ! queue ! rtpmpadepay ! mpegaudioparse ! mpg123audiodec ! audio.

RTSP H264 TS source with NTP sync and Nvidia GPU decoder example:

rtspsrc location=rtsp://h264-encoder.local/main1 rfc7273-sync=true buffer-mode=4 latency=40 ! rtmp2tdepay ! tsdemux latency=0 ! h264parse ! nvh264dec ! video.

HLS example:

uridecodebin uri=http://wowzaec2demo.streamlock.net:1935/vod/mp4:sample.mp4/playlist.m3u8 name=bin ! queue ! video. bin. ! queue ! audio.

Linux webcam example:

v4l2src ! decodebin ! video.

Linux webcam example with watchdog (automatically restarts the pipeline if the webcam stream crashes for some reason):

v4l2src ! watchdog ! decodebin ! video.

If you don't understand what is happening in these lines please check the GStreamer documentation as mentioned above!

Build

$ meson --buildtype=release build
$ ninja -C build

# optional for installing the plugin
$ sudo ninja -C build install

By default it will install in the plugin directory of the user's home directory. (Linux only!)

For system wide installs or other platforms you will need to pass additional options for the install location.

E.g.

meson setup build --buildtype=release --prefix=/usr --libdir=lib/obs-plugins

will install at /usr/lib/obs-plugins.