Larix Broadcaster 4+

Furtree Systems, Inc.

    • 4.4 • 11件の評価
    • 無料



Larix Broadcaster allows streaming video and/or audio live content from your mobile device in real-time to perform real-time remote contribution.
~ SRT streaming in Caller (Push), Listen and Rendezvous mode, libsrt version 1.5.0
~ RTMP and RTSP streaming
New: WebRTC support via WHIP signaling
~ SSL support for RTMPS/RTSPS
~ RIST protocol streaming in Push mode: RIST Main and Simple profiles via librist version 0.2.7
Watch tutorial on creating connections
~ Pause the stream: long tap on Start will pause the stream without disconnecting it, video track will contain a black screen, audio track will contain only silence.
~ Stand-by stream mode: when stream is stopped, long-tap to start a stream in pause mode with separate set of overlays.
~ Watch video tutorial on overlays, pause and stand-by:
~ Talkback for getting audio return feed via SRT, RTMP, Icecast and SLDP. Read more here:
~ UltraHD resolution support.
~ Dolby Vision HDR support (Settings / Video / HDR video menu)
~ Front and back cameras are supported with hot flip.
~ Landscape and portrait mode with live rotation.
~ Multi-camera capture with picture-in-picture and side-by-side on XR, XS and later devices.
~ Dual/Triple camera system support, including wide-angle and telephoto camera.
~ Center stage for iPads, enabled as described at
~ Audio-only capture support: disable preview, stream from background, no video in output stream. Use Audio menu in Larix settings to enable.
~ Autoexposure lock, white balance lock, manual color temperature in Quick settings.
~ Saving to MP4, making screenshots, iCloud support
~ Recording "Compatibility" option in case resulting file has black frames at preview.
~ Record with different parameters like larger resolution
~ Bluetooth audio.
~ Input audio gain control and source selection.
~ Pinch-to-zoom, all iPhone 11 cameras are used.

- H.264 encoding for all protocols including WebRTC
- HEVC/H.265 encoding for SRT, RIST, RTSP
- HEVC over RTMP is supported as non-standard experimental feature
- AAC audio, except for WebRTC
- Opus audio for WebRTC

Insert SEI metadata for NTP sync up, along with specifying NTP server. It's enabled in Advanced menu.

Larix Grove can be used for easy links distribution via deep links and QR codes.

Overlays support:
~ Define image layers with external URL and local images.
~ Assign layers for all mode: streaming, pause and stand-by
~ Define web overlays (web widgets).
~ Define text overlays.
~ Date/time support in overlays as defined on
~ Overlays opacity is available.
~ Enable layers on-the-fly
~ Watch video tutorial on overlays:

Adaptive bitrate (ABR) is available with logarithmic descend, ladder ascend, hybrid approach for SRT and variable FPS. It's disabled by default, check Video menu to use. Learn more in Q11 here:

~ Multiple simultaneous connections support - add several connections profiles and choose any of them for parallel streaming.
~ Streams to any media server like Nimble Streamer, Wowza Streaming Engine, Red5, Flussonic or any other
~ Streams to vMix, OBS Studio and other desktop software
~ Streams to Facebook Live, YouTube Live, Twitch,, Dacast and other live services
~ Streams to Cloudflare Stream via SRT, WebRTC and RTMP

You can browse full document reference for all details regarding setup, usage, streaming to popular platforms like Facebook Live, YouTube Live and other targets:

If you'd like to use our SRT/WebRTC/RTMP/RTSP/RIST streaming library in your own app visit our webpage to get streaming library and SDK.


バージョン 1.3.0

WebRTC publishing support via WHIP signaling with H.264 video and Opus audio





(Updated) Choppy SRT, no HTML overlay, great otherwise

This app works well and fluently in any resolution or protocol, and does its best to deal with drops of bandwidth. I wish it allowed Web page or HTML overlays in addition of the image overlays. Sadly, the frame rate is always choppy when transmitting via SRT and using HEVC. Going at 30 FPS looks like 12 or 15 FPS. (Tried other HEVC 30 FPS sources to the same SRT server, and it ran at 30 FPS without issues.)

Update 2021-07-04: As the developer promised, an update was pushed to solve issues in HEVC. Works flawlessly now. Thank you. Changed the rating from 4 to 5 stars.


We've just sent an update for Larix with HEVC bitrate limit to fix that behavior, just update the app once an update passes Apple review.



Using the app to broadcast children’s soccer game to YouTube.
The app works perfectly when you have decent cellular reception.
The newly added battery indicator really helps.

Is it possible to set camera resolution and streaming resolution separately?
I use the digital zoom a lot. Downscaling 4K to HD would help the image to get less pixelated.

Thank you!


Thank you for your review! Unfortunately you can choose only one resolution at the moment.


Web Widget layout issue with 1.2.16

I love this app and no concern except Web Widget layout.
Web widget H position is reverse left and right in streaming with version 1.2.16 of this App.

My iPhone 14 Pro Display shows web widget on left but appear on right in streaming.

Anyway, thank you for your frequent update and any new features.


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