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added information about feature flags to the readme

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Jasper Hugo 2021-10-25 10:51:45 +07:00
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README.md
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@ -94,6 +94,19 @@ gst-meet --web-socket-url=wss://your.jitsi.domain/xmpp-websocket \
videodemux.video_0 ! queue ! clocksync name=video"
```
## Feature flags
By default, the system native TLS library is used. This can be turned off by passing `--no-default-features` to Cargo, and one of the following features can be enabled:
```
tls-native-tls (the default) link to the system native TLS library
tls-native-tls-vendored automatically build a copy of OpenSSL and statically link to it
tls-rustls use rustls for TLS (note that rustls may not accept some server certificates)
```
These options 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, including DTLS-SRTP (the media streams).
## Debugging
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`.