Question 1

Why does Janus gateway fail to send audio in Chrome after update to version 141?

Accepted Answer

An SDP inconsistency in Janus offered rtcp-fb transport-cc for the Opus audio track without including the transport-wide cc header extension (extmap). Chrome M141 started enforcing this, causing audio issues. A fix has been merged that ensures the extmap is checked before adding the feedback. Update Janus to the latest version to resolve.

Question 2

Why does compiling with janus fail with 'refcount.h' file not found?

Accepted Answer

The janus headers are installed in a non-standard location and the project does not yet ship a pkg-config (.pc) file. As a workaround, add the path manually to your compile flags: `-I$(PREFIX)/include/janus`. For example, if installed to /usr/local, use `CFLAGS="-I/usr/local/include/janus" make`. This will resolve the missing include. Upstream plans to add a .pc file for automatic discovery; see issue #3523.

Question 3

How to fix Janus Gateway segmentation fault in opus_encoder_ctl caused by the AudioBridge plugin?

Accepted Answer

Root cause: in Janus 1.3.2 (`src/plugins/janus_audiobridge.c`, function `janus_audiobridge_handler`), the handler for the `expected_loss` configure parameter calls `opus_encoder_ctl(participant->encoder, OPUS_SET_PACKET_LOSS_PERC(...))` without checking whether the participant's Opus encoder exists. If a `configure` request with `expected_loss` is processed while the participant has no encoder (e.g., a race with handle detach / PeerConnection hangup, as seen in the logs), libopus dereferences a NULL pointer and Janus crashes with SIGSEGV inside `opus_encoder_ctl`. Note that the adjacent `OPUS_SET_BITRATE` and `OPUS_SET_COMPLEXITY` calls are already guarded with `if(participant->encoder)`.

Fix: add the missing NULL check and rebuild the plugin:
```
if(exploss) {
    participant->expected_loss = expected_loss;
    if(participant->encoder)
        opus_encoder_ctl(participant->encoder, OPUS_SET_PACKET_LOSS_PERC(participant->expected_loss));
}
```
Then recompile (`make && make install`) and restart Janus, or upgrade to a Janus release that includes this guard.

Workaround if you cannot patch immediately: stop sending `expected_loss` (exploss) in AudioBridge `configure` requests — the crash only triggers through that code path.

Diagnosis tip: a core dump backtrace showing `opus_encoder_ctl` called from `janus_audiobridge_handler` (libjanus_audiobridge.so) in the same second as `Detaching handle from JANUS AudioBridge plugin` / `Hanging up PeerConnection because of a Detach` matches this exact race condition.

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