> ## Documentation Index
> Fetch the complete documentation index at: https://docs.gcore.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Larix

> Set up Larix Broadcaster for Gcore Video Streaming and configure RTMP stream, camera, video, and audio encoder parameters.

[Larix Broadcaster](https://softvelum.com/larix/) is a free mobile encoder for live streaming. Use it to stream from a smartphone or tablet to Gcore Video Streaming over RTMP, with stream parameters configured through [Larix Grove](https://softvelum.com/larix/grove/).

## Setup

1. Install [Larix Broadcaster](https://softvelum.com/larix/) on a mobile device.

2. To get the server URL and stream key, navigate to the [Gcore Customer Portal](https://portal.gcore.com), select **Streaming** → **Live Streaming**, open the **Live stream settings** for the target stream, and copy the relevant values from the **URLs for encoder** section.

   The **Live stream settings** page shows these fields:

   ![Live stream settings showing the URLs for encoder section with RTMP Server and Stream Key fields](https://mintcdn.com/gcore/Q5BpAhcA5dpz7Wvi/images/docs/streaming/live-streaming/broadcasting-software/larix/larix-live-stream-settings.png?fit=max\&auto=format\&n=Q5BpAhcA5dpz7Wvi\&q=85\&s=95c67572eef7794a0deb00ea8f5c7575)

   Concatenate the Server URL and Stream Key to form the full RTMP URL for the stream:

   ```
   rtmp://vp-push-ed2.gvideo.co/in/{STREAM_ID}?{TOKEN}
   ```

3. Open [Larix Grove](https://softvelum.com/larix/grove/) to create a Larix configuration and share it via QR code.

4. In **Larix Grove**, scroll down to the **Connection** section.

5. Enter the URL and a name for the connection.

6. Click the **QR-code** button to generate a QR code.

7. On the mobile device, open the Larix app and tap the gear icon to open the settings.

8. Tap **Larix Grove** and then tap **Scan Grove QR code**.

9. Scan the QR code generated in Larix Grove. The app configures the connection automatically.

10. Return to the main screen and tap the big white button to start streaming.

## Configure stream parameters

Adjust these settings in [Larix Grove](https://softvelum.com/larix/grove/), which generates the configuration and connection URL as a QR code for sharing with team members.

After changing the settings, click the **QR-code** button to generate a new QR code.

![Larix Grove configuration form showing Connection, Camera, Video encoder, and Audio encoder sections with recommended values](https://mintcdn.com/gcore/Q5BpAhcA5dpz7Wvi/images/docs/streaming/live-streaming/broadcasting-software/larix/larix-grove.png?fit=max\&auto=format\&n=Q5BpAhcA5dpz7Wvi\&q=85\&s=b21203d326595af48f6012317b3d633a)

### Camera parameters

To reduce the original resolution (downscale), set the Resolution field to the target value.

For 60 fps, double the bitrate to maintain stream quality.

* **Resolution:** 1280×720
* **Frame rate:** 30

### Video encoder parameters

* **Video Bitrate:** 2000000 for 720p resolution or 4000000 for 1080p resolution.
* **Keyframe Interval:** 60 (i.e., 2 seconds)

### Audio encoder parameters

* **Audio Bitrate:** 128000
* **Sample Rate:** 44100 or 48000
* **Channels count:** 2