Several phones, one studio

Cameras

• Multiview and tally. Connect up to 4 phones by default and up to 16 in Settings → Cameras. Each phone gets a camera number and shows a red tally when it’s live, so whoever is on camera knows. Cut with a click or the keys 1–8.
• Program layouts. Picture in picture (any corner), side by side or a 2×2 grid, with a cut or a dissolve, straight into “Camlane Camera”. OBS needs only one source.
• One camera per phone on Linux. Besides “Camlane Camera” for the program, each phone is its own virtual camera, “Camlane Camera 1” to “Camlane Camera 4”.
• Phones nobody is watching rest. A phone that isn’t on program, in a tile or a preview drops to one picture a second and comes back on a fresh keyframe the moment you show it. Cameras in preview drop to a lower bitrate.

The auto-director

The auto-director cuts the program to whoever is speaking, from each phone’s voice activity. It holds every shot for at least 3 seconds, pauses for 15 seconds after you cut by hand, can go to a wide shot when nobody talks, and can prefer cameras whose auto-framing sees a face. Turn it off and you’re the director again.

Studio audio

Every phone’s microphone goes through the same chain on the computer:

Stage	What it does
Noise cancellation	Standard (RNNoise, adds 10 ms, about 0.5% of one CPU core per phone) or Strong (DeepFilterNet 3, adds 30 ms, about 5% of a core, keeps 50 dB of room tone instead of dead silence)
Studio chain	High-pass filter, noise gate, de-esser, compressor and 3-band EQ, each with its own switch
Presets	Natural (default), Podcast, Broadcast, Warm, Bright and Custom
Loudness	Keeps the microphone around −16 LUFS, the usual streaming level, adapting only while someone talks
Limiter	Keeps peaks under −1 dBFS with 1 ms of look-ahead

Measured on an Intel Core i7-12700, the whole standard chain costs 0.5–0.65% of one core per phone and adds 10 ms, plus 1 ms for the limiter. The Audio page has meters for the output, loudness, limiter and added delay, and per phone the level, gain reduction, noise floor and whether someone is speaking. Headphone monitoring plays the processed mic on any output, never into the virtual microphone.

Phones without the desktop chain still have phone noise reduction: Android’s own noise suppression and automatic gain, a low-power option on phones that support it.

Several microphones

• Auto mixer. Every phone is mixed with gain sharing: whoever is talking gets the level, the others are turned down, so room noise doesn’t add up.
• Stereo pair. Two phones become the left and right of one stereo microphone. Camlane lines them up first by the phones’ clocks, then by sound both phones hear. In a test with one microphone 12 ms late, it measured 11.98 ms within a second and kept the channels aligned to one sample.
• Follow the picture. Or let the sound follow the camera on program, or pin it to one phone.

Multi-camera with tally shipped in 0.1. Layouts, the auto-director, studio audio and the mixer are new in 0.2.