gst-meet provides a library and tool for integrating Jitsi Meet conferences with GStreamer pipelines. You can pipe audio and video into a conference as a participant, and pipe out other participants' audio and video streams.
Thanks to GStreamer's flexibility and wide range of plugins, this enables many new possibilities.
For nix users, a `shell.nix` is provided. Within the repository, run `nix-shell --pure` to get a shell with access to all needed dependencies (and nothing else).
Install the dependencies described above, along with their `-dev` packages if your distribution uses them. `cargo build` should then successfully build the libraries and `gst-meet` binary.
You can pass two different pipeline fragments to gst-meet.
`--send-pipeline` is for sending audio and video. If it contains an element named `audio`, this audio will be streamed to the conference. The audio codec must be 48kHz Opus. If it contains an element named `video`, this video will be streamed to the conference. The video codec must match the codec passed to `--video-codec`, which is VP8 by default.
`--recv-pipeline-participant-template` is for receiving audio and video from other participants. This pipeline will be created once for each other participant in the conference. If it contains an element named `audio`, the participant's audio (48kHz Opus) will be sent to that element. If it contains an element named `video`, the participant's video will be sent to that element. The strings `{jid}`, `{jid_user}`, `{participant_id}` and `{nick}` are replaced in the template with the participant's full JID, user part, MUC JID resource part (a.k.a. participant/occupant ID) and nickname respectively.
Stream a .webm file containing VP8 video and Vorbis audio to the conference. This pipeline passes the VP8 stream through efficiently without transcoding, and transcodes the audio from Vorbis to Opus:
Stream the default video & audio inputs to the conference, encoding as VP8 and Opus, display incoming video streams at 360p, and play back incoming audio (a very basic, but completely native, Jitsi Meet conference!):
The above .webm file unfortunately may not play in most players, because the resolution will change whenever JVB changes which simulcast layer it is forwarding. You could post-process the recording to scale the lower resolution frames up, or you could do the decoding, scaling, and re-encoding at recording time as follows:
Play a YouTube video in the conference. By requesting Opus audio and VP9 video from YouTube, and setting the Jitsi Meet video codec to VP9, no transcoding is necessary. Note that not every YouTube video has VP9 and Opus available, so the pipeline may need adjusting for other videos.
By default, the `rustls` TLS library is used with the system's native root certificates. This can be turned off by passing `--no-default-features` to Cargo, and one of the following features can be enabled:
Building with the `tls-insecure` feature adds a `--tls-insecure` command line flag which disables certificate verification. Use this with extreme caution.
The `tls-*` flags only affect the TLS library used for the WebSocket connections (to the XMPP server and to the JVB). Gstreamer uses its own choice of TLS library for its elements. DTLS-SRTP (the media streams) is handled via GStreamer and uses automatically-generated ephemeral certificates which are authenticated over the XMPP signalling channel.
Building with the `log-rtp` feture adds a `--log-rtp` command line flag which logs information about every RTP and RTCP packet at the `DEBUG` level.
It can sometimes be tricky to get GStreamer pipeline syntax and structure correct. To help with this, you can try setting the `GST_DEBUG` environment variable (for example, `3` is modestly verbose, while `6` produces copious per-packet output). You can also set `GST_DEBUG_DUMP_DOT_DIR` to the relative path to a directory (which must already exist). `.dot` files containing the pipeline graph will be saved to this directory, and can be converted to `.png` with the `dot` tool from GraphViz; for example `dot filename.dot -Tpng > filename.png`.
## License
`gst-meet`, `lib-gst-meet`, `nice` and `nice-sys` are licensed under either of
* Apache License, Version 2.0, ([LICENSE-APACHE](LICENSE-APACHE) or http://www.apache.org/licenses/LICENSE-2.0)
* MIT license ([LICENSE-MIT](LICENSE-MIT) or http://opensource.org/licenses/MIT)
at your option.
The dependency `xmpp-parsers` is licensed under the Mozilla Public License, Version 2.0, https://www.mozilla.org/en-US/MPL/2.0/
The dependency `gstreamer` is licensed under the GNU Lesser General Public License, Version 2.1, https://www.gnu.org/licenses/old-licenses/lgpl-2.1.en.html.
## Contribution
Any kinds of contributions are welcome as a pull request.
Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in these crates by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.
