Function log_stream_settings 

pub(crate) fn log_stream_settings(
    tag: &str,
    settings: &CaptureSettings,
    n_stripes: usize,
    video_encoder: Option<&FrameEncoder>,
)

One-shot “Stream settings active” line, printed by the thread that owns the encoders once the selection is final (calloop for zero-copy, encode thread for readback, the X11 zero-copy backends at their start), tagged for the backend that prints it.