Efficient tools to build your streaming infrastructure

Larix Broadcaster for iOS

iOS apps and SDK for capturing and streaming

iOSLarix Broadcaster

Encode and stream content

The core of our tools is Larix streaming library.
Key content streaming features include:

SRT Ready
  • SRT in Push (Caller), Listen and Rendezvous modes with errors recovery and encryption, libsrt version 1.5.0.
  • WebRTC output with WHIP signaling, see more details below.
  • RTMP publishing, including RTMPS (RTMP over SSL).
  • RTSP publishing, including RTSPS (RTSP over SSL).
  • RIST protocol Push mode support: RIST Main and Simple Profile, librist 0.2.7.
    Use "rist://ipaddress:port" for new connection URL.
  • Multiple simultaneous connections allow streaming to several destinations at the same time,
    with any combination of SRT, RTMP, WebRTC, RTSP and RIST.
  • Pause and Stand-by modes, see description below.
  • Adaptive bitrate (ABR) video is supported via logarithmic descend, ladder ascend, hybrid approach and variable FPS.
    Read respective Q11 in Larix FAQ to learn more technical details.
  • Talkback for Larix Broadcaster allows getting audio return feed from studio.
  • Insert SEI time metadata and specify NTP server, this allows synchronizing streams on server side.
    Use Advanced menu to operate it. Watch video tutorial to see it in action.

Minimum supported iOS version is 12.

Video is encoded with interleaved H.264/AVC everywhere.
H.265/HEVC is available only supporting devices. HEVC over RTMP is a non-standard feature.
Audio is encoded with AAC everywhere except WebRTC. In WebRTC, the codec is Opus.

WebRTC output:


Larix Grove format allows you easily distribute your connection and encoder settings via deep links and QR codes.

Full support for Facebook Live, YouTube Live, Twitch, Wowza Streaming Cloud, Amazon Interactive Video Service, Periscope, Dacast, Akamai, Limelight and other online services. All popular authentication methods are supported. Check docs reference for setup instructions.

Download at App Store

Larix Broadcaster free app

You can use streaming capabilities for free using our fully-functional Larix Broadcaster apps.
Besides encoding and streaming features, Larix Broadcaster uses full power of mobile devices:

  • Landscape and portrait various modes support with device dynamic orientation.
  • "Always vertical" and "Always horizontal" modes
  • Front and back cameras with hot switch.
  • Dolby Vision HDR support on iPhone 12 and beyond along with certain iPad models.
    Enabled in Settings / Video / HDR video menu.
  • iPhone 11 Dual/Triple camera system support, including wide-angle and telephoto camera
  • Multi-camera capture with picture-in-picture and side-by-side. Supported on iPhone XR, iPhone XS, iPhone XS Max, iPad Pro (3rd generation) and later devices.
    To use this option, go to Settings -> Capture and encoding -> Video -> Multi-camera capture.
  • Center stage on latest iPads, enabled as described here.
  • 4K streaming support on latest iOS devices.
  • Video+audio, video only and audio only modes.
  • Pause the stream: when streaming, long tap on Start will pause the stream without disconnecting it.
    Video track will contain a black screen, audio track will contain silence.
    A separate set of overlays can be mapped onto pause.
  • Stand-by mode: when stopped, long tap on Start will start stream in pause mode, waiting to start with the camera image.
    A separate set of overlays can be mapped onto stand-by.
  • Image overlays video tutorial shows overlays for streaming as well as pause and stand-by modes.
  • Input audio gain control
  • Audio-only capture mode: disable preview, stream from background, no video in output stream.
    Watch Audio-only background streaming video tutorial.
  • Fixed FPS can be selected from the list of supported values.
  • Auto Focus Lock - long press anywhere in the preview, and AF is locked until you tap to re-focus.
  • Recording to MP4 and saving screenshots with iCloud Drive and Photo Library support and files separation.
  • Use custom parameters (resolution, codec etc) for recording.
  • Pinch-to-zoom, including iPhone 11 multi-camera.
  • Bluetooth audio.
  • Flash light support.

Overlays support:

  • Image layers with external URL and local images;
  • Web widgets;
  • Text and HTML widgets;
  • Timestamp support as defined on unicode.org, e.g. <%date('MMM dd, HH:mm:ss', en_US) %>
  • Assign layers for all mode: streaming, pause and stand-by;
  • Image overlays video tutorial shows overlays for streaming, pause and stand-by modes.

Join Beta program in TestFlight using this link to obrtain the latest version and get updates befopre their official release.

This tutorial shows the setup of outgoing connections in Larix Broadcaster.

Visit documentation reference to learn more about Larix Broadcaster setup and usage.

Download at App Store

Larix Screencaster free app

Larix Screencaster

iOS allows capturing the screen of user device, so Larix Screencaster uses streaming capabilities to capture the screen, encode and stream it.
However, iOS puts some limitations on audio. If you stream your screen, you can only use your microphone. If currently opened application supports ReplayKit, then you'll be able to stream its sound.
Read this article for setup details or refer to Apple's support article or support video with our own setup video.

Download at App Store

Larix Broadcaster SDK

You can get Larix library, free app and other source code examples by subscribing to our SDK.
This means you can create your own mobile solutions and customize our solutions to your streaming use cases and scenarios.

Go to Larix Broadcaster SDK for iOS page

Documentation and FAQ

This product uses SRT library distributed under MPL-2.0 license.
This product uses librist library distributed under BSD 2-clause "Simplified" license.
iOS Larix Broadcaster uses Scrollable Segmented Control distributed under MIT license.

This product includes software developed by the OpenSSL Project for use in the OpenSSL Toolkit.

Larix Broadcaster uses Pion implementation of WebRTC API. Special thanks to Sean DuBois and all Pion contributors.

Larix Player

If you need not only to produce but to play live stream on your mobile device, check out Larix Player for Android and iOS.