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Set up two separate publishing connections: Larix Broadcaster sends your phone’s camera feed to the relay’s ingest URL and credential; the relay then sends that feed to YouTube using the RTMPS URL and stream key from YouTube Live Control Room. The keys are not interchangeable. Because relay setup varies by product, use the relay provider’s exact instructions for its application path, port and authentication.
How the two-hop stream works
- Phone to relay: Larix publishes to the relay’s ingest endpoint, using the protocol and credential supplied by the relay administrator.
- Relay to YouTube: The relay publishes to YouTube’s ingest address with the YouTube stream key for the broadcast.
- End-to-end check: Test the entire path and check YouTube’s stream health before the event.
Do not enter YouTube’s destination key in Larix unless your relay has explicitly configured that same value as its inbound credential. The relay has separate input and output settings. The specific server, version, hosting environment, ports and authentication scheme are not specified here, so there is no safe universal relay configuration or command.
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Configure Larix to publish to the relay
- In Larix Broadcaster, open Connections and add a new publishing connection. Choose RTMP or RTMPS to match the relay’s advertised ingest protocol. Larix supports standard RTMP and RTMPS, but the relay must support the protocol you select.
- Enter the relay’s ingest address and its corresponding stream name, key or other credential. A typical RTMP address comprises a protocol prefix, server or domain, optional port, application name and stream name/key. Softvelum’s Larix documentation describes a full URL format that can combine the server/application address and stream name. If Larix provides separate fields, use them as intended; combine values only when the connection field expects a full URL.
- Confirm the hostname, port, application path and credential with the relay administrator. A sample URL in documentation is a format illustration, not a working endpoint or credential.
- Save the connection and start a short test broadcast. Confirm in the relay’s own interface or logs that it receives the phone’s stream.
Whether TLS terminates at the relay, which ports must be open, and how credentials are stored depend on the relay implementation. Check that product’s documentation rather than assuming a particular security feature or firewall rule.
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Configure the relay to send to YouTube
- Open the broadcast in YouTube Live Control Room and go to its stream settings. Reveal the RTMPS URL using the lock icon in the Stream URL field, then copy the URL and the stream key.
- In the relay’s output configuration, enter that YouTube RTMPS destination and the matching YouTube stream key. YouTube’s displayed default may be an RTMP address, so select or reveal the RTMPS variant when using secure transport. YouTube recommends RTMPS as a secure extension to RTMP (YouTube encoder settings and bitrates).
- If the relay offers more than one YouTube ingest address, use the address that corresponds to the broadcast and protocol selected in Control Room. YouTube’s API distinguishes primary and backup ingest addresses; whether a relay can use both depends on that relay’s features (YouTube Live Streams API).
- Keep the relay’s inbound Larix credential separate from the YouTube output key. Restrict access to the YouTube key; if it is exposed, rotate it through YouTube.
Choose encoder settings for the phone and uplink
YouTube’s current guidance lists RTMP/RTMPS ingest, H.264, H.265/HEVC or AV1 video, frame rates up to 60 fps, constant bitrate encoding, and AAC or MP3 audio. It recommends a two-second keyframe interval and says not to exceed four seconds. Its bitrate recommendations depend on codec, resolution and frame rate, so select the matching row in YouTube’s live table rather than applying a single bitrate to every stream (YouTube encoder settings and bitrates).
#1 Best Overall
ZowieBox, 4K HDMI NDI Video Encoder/Decoder, HDMI NDI | Native NDI HX3, UVC to HDMI, Pass-Through Video Capture, SRT/RTMP(S)/RTSP, Live Streaming
- Compact but Powerful Design: ZowieBox is smaller than a phone, featuring a tally light and LCD screen for streaming status. Capture console gameplay in up to 4K with zero-lag HDMI passthrough, while the built-in video encoder converts video for IP streaming. The IP stream can also be decoded back to a 4K HDMI signal.
- Standalone Game Streaming: Just plug and play—ZowieBox enables PC-free live gaming without affecting gameplay. As an RTMP hardware encoder and HDMI streamer, it delivers stable streaming directly from your source, making it ideal for gaming, live events, and professional broadcasting.
- NDI|HX3 Converter Technology: ZowieBox converts HDMI signals to NDI|HX3/HX2/HX, functioning as an NDI video encoder, or NDI Video Decoder for flexible IP workflows. Certified NDI technology enables low-latency gameplay streaming through OBS/vMix. Note: Encoder and decoder modes cannot run simultaneously; full NDI signals are not supported.
- UVC to HDMI Conversion: Supporting up to 4K@30fps and 1080p@60fps decoding, ZowieBox enables flexible conversion for webcam and video workflows. As a video decoder and HDMI to IP converter, it expands connectivity options for professional video devices. Note: USB capture card functionality is not currently supported.
- All-around Configuration Options: Control ZowieBox through its web UI on a PC, phone, or tablet. Manage connected PTZ cameras, tally light, video/audio, OSD, work mode, streams, network, and system settings. Support for VISCA over IP encoder workflows enables flexible PTZ control, while the dashboard provides video preview and system status.
Use only settings available in your Larix build and phone. Softvelum describes H.264/AVC video and AAC audio support; HEVC transmission over Enhanced RTMP is a premium feature on supported devices, not a capability to assume for every phone or Larix installation (Larix Broadcaster). Choose a target bitrate that fits both the applicable YouTube recommendation and the phone’s real upload capacity. Softvelum notes that poor network conditions can cause RTMP/RTSP frame loss and describes adaptive bitrate options in its Larix FAQ.
- Resolution and frame rate: Match the output to the phone’s capabilities, the available uplink and the corresponding YouTube recommendation.
- Video bitrate: Use YouTube’s current table for the chosen codec, resolution and frame rate; test upload capacity before the event.
- Keyframes: Set a two-second interval where available, and do not exceed four seconds.
- Audio: Verify that audio is enabled and encoded as AAC or MP3 for the RTMP/RTMPS stream.
- Network adaptation: If the mobile connection varies, lower the target quality or bitrate, or use Larix adaptive bitrate options if available and appropriate.
Run a full-path preflight
- Start a representative test from Larix, including the movement, lighting and audio conditions expected during the real broadcast.
- Verify that the relay receives the stream and forwards it to the intended YouTube broadcast.
- Check YouTube Live Control Room for the incoming video and audio, then review stream health indicators for bitrate, codec, audio, keyframe or starvation warnings.
- Test close to the event and on a network comparable to the one you will use live. YouTube recommends testing the broadcast and monitoring stream health (YouTube encoder settings and bitrates; YouTube Live Streams API).
Troubleshoot common failures
| Symptom | Likely cause | What to check or change |
|---|---|---|
| Larix cannot connect to the relay | Incorrect ingest host, port, application path, protocol or credential, or the phone cannot reach the host. | Compare every field with the relay’s exact ingest details and test phone connectivity on the network in use. If publishing across WAN/LAN boundaries to a server on a local network, router NAT or port forwarding may be needed in that specific setup; it is not a universal requirement (Larix FAQ). |
| RTMPS or SSL error on the YouTube leg | The relay is using an RTMP URL, a mismatched address, or an incompatible port or TLS configuration. | Confirm the destination came from YouTube’s RTMPS field and begins with rtmps. YouTube says specifying port 443 can help with some SSL errors if the URL and encoder permit it. Keep the actual Control Room hostname and path; do not substitute an illustrative example (YouTube RTMPS help). |
| The relay receives video, but YouTube does not | The relay output destination or YouTube stream key is wrong, even though Larix-to-relay ingest works. | Check the relay’s output URL and YouTube key separately from Larix’s relay-ingest credential. Then inspect the broadcast’s YouTube status and health indicators (YouTube RTMPS help; YouTube Live Streams API). |
| Video appears, but there is no audio | The outgoing stream has no audio track, or its audio configuration is unsupported or disabled. | Check that the phone is capturing audio, that Larix is including it, and that the relay forwards it. YouTube’s API identifies noAudioStream as a stream configuration issue; its encoder guidance lists AAC and MP3 for RTMP/RTMPS (YouTube Live Streams API; YouTube encoder settings and bitrates). |
| Mobile video is unstable or drops frames | The selected bitrate or output quality exceeds what the phone’s current connection can sustain. | Reduce resolution, frame rate or bitrate to fit the uplink, or use Larix’s supported adaptive bitrate option. Repeat the test under conditions similar to the live event (Larix FAQ). |
What to verify in a relay before relying on it
Relay products differ. Before an event, confirm from the chosen product’s documentation that it accepts Larix’s RTMP or RTMPS input and can forward to YouTube RTMPS. Also check where TLS terminates, how the two credential sets are handled, which ports and firewall rules are required, and whether it provides health metrics or backup output. YouTube’s primary and backup ingest addresses do not by themselves establish that a particular relay supports failover.
Rank #2
UNISHEEN 1080P60 HDMI Video Encoder, H.265/H.264 Live Streaming Encoder, HDMI to RTSP/RTMP/SRT/HLS/WebRTC IPTV Encoder for YouTube Facebook Live, Browser Setup, No PC Software Needed
- 【Hardware H.265/H.264 Encoding at 1080P60】Dedicated hardware encoder delivers broadcast-quality 1080P60 streams with H.265/H.264 compression. Reduces bandwidth usage by up to 50% compared to legacy H.264-only solutions, while maintaining crisp, crystal-clear video output.
- 【Broad Protocol Support for IP Distribution】 Supports SRT, RTMP(S), RTSP, UDP, HTTP, HLS, WebRTC, TRTC, Icecast and SHOUTcast — integrate seamlessly with CDNs, surveillance NVRs, IPTV systems and browser-based monitoring dashboards. One device replaces multiple single-purpose streaming boxes.
- 【Browser-Based Setup in Minutes】 Set up in minutes through any browser — no software, drivers or OS compatibility issues. DHCP is enabled by default to prevent IP address conflicts on your network. Note: basic networking knowledge (IP address, RTSP/RTMP configuration) is recommended for advanced streaming setups.
- 【Compact Design with Flexible Deployment】Palm-sized form factor (approx. 90×54×29mm) fits easily behind monitors, on shelves, or in equipment racks. Low power consumption ensures reliable 24/7 operation for live events, remote monitoring, and digital signage.
- 【Professional Audio & OSD Overlay + 1-Year Warranty】 Supports HDMI embedded audio plus external 3.5mm input. Built-in OSD generator adds scrolling text, logos, or timestamps directly to the video stream — ideal for branding, event info, or security labeling. Backed by a 1-year warranty and 24/7 online technical support.
Or let it run in the cloud
Larix with a relay is for sending a live phone-camera feed. For a different job—keeping uploaded videos looping as a 24/7 YouTube stream—StreamNeo runs the playback in the cloud:
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- Upload a recording or build a playlist.
- Add your YouTube stream key once.
- Go live; StreamNeo loops the uploaded video from the cloud.
Nothing has to stay on at home. The video streams as uploaded, up to 4K 60fps, at one flat price per slot. If YouTube drops the stream, StreamNeo automatically recovers. The first day is free with no card required; it is one free day per account. Monthly service is $9.99 per month. UPI and cards are available in India; card checkout is available worldwide. Start your free StreamNeo day.
Quick Recap
Bestseller No. 1
Bestseller No. 3
Best Value
HEVC MPEG4 H.265 H.264 HDMI to IP Network Video Encoder, 1080P HD Digital Video Audio Encoder Hardware Supports RTSP RTMPS UDP HLS SRT, for IPTV, Live Streaming, YouTube, Facebook, OBS, NVR, etc.
- ⭐【Innovative Product with Leading Technology】- Equipped with an advanced H.265/H.264 dual encoding chip, supports 1920x1080 resolution input and output, achieving 60fps high-definition presentation with realistic and delicate color reproduction and lossless detail. It also supports HDCP 1.4 decryption, easily decoding various HDMI high-definition video sources, delivering a cinematic visual experience for both professional live streaming and high-definition content transmission.
- ⭐【Multi-protocol and Multi-platform Compatibility】- Fully compatible with streaming protocols such as HTTP, RTSP, RTMP(S), SRT, HLS(M3U8), MP4, Multicast(UDP, RTP, PTL), ONVIF, FLV, it can simultaneously output 4 video streams with different protocols and push them to live streaming platforms such as YouTube, Facebook, Twitch, and Vimeo with one click. Simultaneous live streaming across multiple platforms can be achieved without additional equipment.
- ⭐【Highly Customizable Settings to Meet Individual Needs】- It supports adding static text, scrolling captions, brand logos, and timestamps. Users can freely adjust core parameters such as video resolution, frame rate, and bitrate, and also perform personalized editing functions such as video cropping, rotation, flipping, and mirroring. It supports dual input of HDMI embedded audio and line-in audio, with adjustable sound quality, making your live stream content more distinctive and allowing you to create a unique brand live stream style.
- ⭐【Stable and Efficient Transmission, Easy Operation】- Employing HDMI to Ethernet core connection technology, it ensures stable and reliable network transmission with low latency and no lag, adapting to various network environments. Equipped with an intuitive user interface and detailed instruction manual, no professional technical background is required; setup can be completed quickly after connecting the device. It is also compatible with multiple terminals such as computers and mobile phones for management, and the video stream status can be viewed in real time via a URL.
- ⭐【Lifetime Free Warranty and Technical Supports】- All URayCoder video codecs come with a lifetime free warranty and technical supports, supporting secondary development and feature customization to meet enterprise-level personalized needs. Meanwhile, we providing many kinds of customization services such as shell pattern printing, logo addition, hardware and function development, ensuring reliable quality and worry-free after-sales service.
Rank #4
Blackmagic Design Streaming Encoder 4K – 4K Ultra HD Live Streaming via SRT & RTMP, SDI Input, Ethernet + Mobile, Includes 6ft Power Cord (BDLKWEB/D/SED4K)
- 4K & HD STREAMING IN H.264 AND H.265 – Self-contained processor supporting H.264 and H.265 encoding in HD or Ultra HD (up to 2160p60) via SRT or RTMP, streaming directly to YouTube, Facebook, X, Twitch, Zoom, Microsoft Teams, OBS, Wowza, and many more — no encoding PC needed.
- 12G-SDI INPUT WITH STANDARDS CONVERSION – Supports input resolutions up to DCI 4K60 with an SDI input and SDI loop output, plus Teranex-powered automatic standards conversion so any HD or Ultra HD source streams cleanly at any target resolution.
- DUAL MONITOR OUTPUTS – Features both SDI and HDMI monitor outputs with a user-configurable standards converter on both the 12G-SDI Out and 4K HDMI Out, so you can feed a confidence monitor or downstream device at any required format independent of your streaming standard.
- ETHERNET + 5G/4G MOBILE WITH AUTO-FAILOVER – Connect via Gigabit Ethernet (10/100/1000BASE-T) or tether a smartphone via USB-C for mobile data, with automatic switchover between connections — ensuring your stream stays on air even if the primary internet connection drops.
- CLOSED CAPTIONS, TIMECODE & REST API – Supports embedding CEA-608 and CEA-708 closed captions in live RTMP streams, source timecode over RTMP and SRT, and offers a REST API over Ethernet for external HTTP control — ideal for broadcast automation and accessibility-compliant workflows.
Rank #3
URayCoder HD HEVC H.265 MPEG4 H.264 4K HDMI to Video Streaming IPTV Encoder for HDMI to RTSP RTMP HTTP UDP HLS SRT Facebook YouTube Live Streaming Server
- 【Innovative Product with Leading Technology】- Equipped with an advanced H.265 /H.264 dual encoding chip, supports 4K UHD (3840x2160) video input and output, with a maximum frame rate of 30fps at 4K resolution and up to 120fps at 2K and lower resolutions, delivering a smooth and detailed visual experience. It also supports HDCP 1.4 decryption, easily decoding various HDMI ultra HD video sources, delivering a cinematic visual experience for both professional live streaming and 4K ultra HD content transmission.
- 【Multi-protocol and Multi-platform Compatibility】- Fully compatible with streaming protocols such as HTTP, RTSP, RTMP(S), SRT, HLS(M3U8), MP4, Multicast(UDP, RTP, PTL), FLV, WebRTC, TRTC, ICECAST, it can simultaneously output 4 video streams with different protocols and push them to live streaming platforms such as YouTube, Facebook, Twitch, and Vimeo with one click. Simultaneous live streaming across multiple platforms can be achieved without additional equipment.
- 【Highly Customizable Settings to Meet Individual Needs】- It supports adding static text, scrolling captions, brand logos, and timestamps. Users can freely adjust core parameters such as video resolution, frame rate, and bitrate, and also perform personalized editing functions such as video cropping, rotation, flipping, and mirroring. It supports dual input of HDMI embedded audio and line-in audio, with adjustable sound quality, making your live stream content more distinctive and allowing you to create a unique brand live stream style.
- 【Stable and Efficient Transmission, Easy Operation】- Employing HDMI to Ethernet core connection technology, it ensures stable and reliable network transmission with low latency and no lag, adapting to various network environments. Equipped with an intuitive user interface and detailed instruction manual, no professional technical background is required; setup can be completed quickly after connecting the device. It is also compatible with multiple terminals such as computers and mobile phones for management, and the video stream status can be viewed in real time via a URL.
- 【Lifetime Free Warranty and Technical Supports】- All URayCoder video codecs come with a lifetime free warranty and technical supports, supporting secondary development and feature customization to meet enterprise-level personalized needs. Meanwhile, we providing many kinds of customization services such as shell pattern printing, logo addition, hardware and function development, ensuring reliable quality and worry-free after-sales service.
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
