022afa6375
The NDI closed captions specifications [1] define a variation where metadata is attached to the video frame. This requires the AFD buffer to be v210 encoded. This commit applies this strategy. Another difference with previous version is that when an error occurs while encoding or decoding a meta, next meta are also tried instead of failing immediately. Receiving closed captions as a standalone metadata is kept for interoperability purposes. In this case, metadata is also expected to be v210 encoded. [1]: http://www.sienna-tv.com/ndi/ndiclosedcaptions.html Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-rs/-/merge_requests/1356> |
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| src | ||
| build.rs | ||
| Cargo.toml | ||
| LICENSE-MPL-2.0 | ||
| README.md | ||
GStreamer NDI Plugin
Compatible with NDI SDK 5.x
This is a plugin for the GStreamer multimedia framework that allows GStreamer to receive or send an NDI stream.
This plugin has been initially developed by Teltek and was funded by the University of the Arts London and The University of Manchester.
Currently the plugin has a source element for receiving from NDI sources, a sink element to provide an NDI source and a device provider for discovering NDI sources on the network.
The plugin is loading the NDI SDK at runtime, either from the default library
path or, if set, from the directory given by the NDI_RUNTIME_DIR_V5
environment variable.
Some examples of how to use these elements from the command line:
# Information about the elements
$ gst-inspect-1.0 ndi
$ gst-inspect-1.0 ndisrc
$ gst-inspect-1.0 ndisink
# Discover all NDI sources on the network
$ gst-device-monitor-1.0 -f Source/Network:application/x-ndi
# Audio/Video source pipeline
$ gst-launch-1.0 ndisrc ndi-name="GC-DEV2 (OBS)" ! ndisrcdemux name=demux demux.video ! queue ! videoconvert ! autovideosink demux.audio ! queue ! audioconvert ! autoaudiosink
# Audio/Video sink pipeline
$ gst-launch-1.0 videotestsrc is-live=true ! video/x-raw,format=UYVY ! ndisinkcombiner name=combiner ! ndisink ndi-name="My NDI source" audiotestsrc is-live=true ! combiner.audio
Feel free to contribute to this project. Some ways you can contribute are:
- Testing with more hardware and software and reporting bugs
- Doing pull requests.
Closed Captions Support
Closed captions support is based on 1 & 2.
This pipelines streams a test video with test subtitles from gst-plugins-rs/video/closedcaption. Run from the gst-plugins-rs root directory.
# Audio/Video sink pipeline with closed captions (cc start around 0:00:14)
$ gst-launch-1.0 \
ndisinkcombiner name=ndicombiner ! ndisink ndi-name="My NDI source" \
cccombiner name=cccombiner ! videoconvert ! video/x-raw,format=UYVY ! ndicombiner.video \
videotestsrc is-live=true ! cccombiner. \
filesrc location=video/closedcaption/tests/dn2018-1217.scc ! sccparse ! cccombiner.caption \
audiotestsrc is-live=true volume=0.1 ! ndicombiner.audio
# Discover all NDI sources on the network
$ gst-device-monitor-1.0 -f Source/Network:application/x-ndi
# Audio/Video source pipeline with closed caption overlay
$ gst-launch-1.0 \
ndisrc ndi-name="_REPLACE_WITH_SOURCE_NAME_" ! ndisrcdemux name=demux \
demux.video ! queue ! cea608overlay ! videoconvert ! autovideosink \
demux.audio ! queue ! audioconvert ! autoaudiosink
# Variant 1: sink pipeline with c708 closed captions
$ gst-launch-1.0 \
ndisinkcombiner name=ndicombiner ! ndisink ndi-name="My NDI source" \
cccombiner name=cccombiner ! videoconvert ! video/x-raw,format=UYVY ! ndicombiner.video \
videotestsrc is-live=true ! cccombiner. \
filesrc location=video/closedcaption/tests/dn2018-1217.scc ! sccparse ! ccconverter ! closedcaption/x-cea-708,format=cdp ! cccombiner.caption \
audiotestsrc is-live=true volume=0.1 ! ndicombiner.audio
# Variant 2: sink pipeline with c608 and c708 closed captions
$ gst-launch-1.0 \
ndisinkcombiner name=ndicombiner ! ndisink ndi-name="My NDI source" \
cccombiner name=cccombiner_1 ! cccombiner name=cccombiner_2 ! videoconvert ! video/x-raw,format=UYVY ! ndicombiner.video \
videotestsrc is-live=true ! cccombiner_1. \
filesrc location=video/closedcaption/tests/dn2018-1217.scc ! sccparse ! tee name=cctee \
cctee. ! ccconverter ! closedcaption/x-cea-608,format=raw ! cccombiner_1.caption \
cctee. ! ccconverter ! closedcaption/x-cea-708,format=cdp ! cccombiner_2.caption \
audiotestsrc is-live=true volume=0.1 ! ndicombiner.audio
License
This plugin is licensed under the MPL-2 - see the LICENSE file for details
Acknowledgments
- University of the Arts London and The University of Manchester.
- Sebastian Dröge (@sdroege).