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For a 24/7 stream, the connection settings are only part of the job: choose a bitrate your upload can sustain, allow bandwidth headroom, test the complete route, and plan for power, heat, app behavior, and interruptions.
Can Larix send SRT directly to YouTube Live?
Possibly, but do not assume it. Larix Broadcaster supports SRT publishing in Push (Caller), Listener, and Rendezvous modes. These describe how Larix connects to an SRT receiver; they do not identify YouTube as that receiver. YouTube’s current encoder guidance lists RTMP/RTMPS and does not provide a direct SRT URL in that guidance. Softvelum’s SRT information describes YouTube SRT ingest as upcoming, so availability may depend on rollout or account settings.
Open the channel’s Live Control Room and check the current stream setup options. Use direct SRT only if YouTube actually presents an SRT endpoint and its connection requirements for that channel. Do not guess a host, port, stream ID, passphrase, or latency value. If no SRT option appears, use RTMP/RTMPS for the YouTube-facing connection, or contribute SRT to a compatible relay and have that relay publish to YouTube by a supported ingest method.
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- 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.
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Choose the connection path before setting Larix options
Direct to YouTube over RTMP/RTMPS
If Live Control Room offers RTMP/RTMPS but not SRT, configure Larix for the supported YouTube-facing protocol and use the server address and stream key supplied by YouTube. YouTube recommends RTMPS. This path avoids an intermediate SRT relay.
SRT from Larix to a relay, then onward to YouTube
Use this arrangement when you specifically need SRT on the contribution leg and have a compatible receiving server. Obtain the receiver’s actual address, port, mode, and any stream ID or passphrase from its operator. Configure the relay’s separate output to YouTube using a protocol and endpoint accepted by the channel. This adds a service and another possible failure point, so monitor both the Larix-to-relay connection and the relay-to-YouTube output.
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- H.264
- H.265 Stream
- 1080p 60fps
- 12G-SDI In/Loop Out
Configure Larix SRT settings to match the receiver
Larix’s available controls can vary by platform and version. Treat the receiving server’s instructions as authoritative; values that do not match its setup will prevent a connection or produce an unusable feed.
- Select the SRT mode required by the receiver. Larix lists Push (Caller), Listener, and Rendezvous. Caller/Push is commonly suited to a phone initiating an outbound connection to a server, but the receiver’s topology determines the correct choice. Do not select a mode just because it sounds like the usual mobile setup.
- Enter the receiver’s SRT address and port. Use the exact endpoint provided by the SRT server or relay. YouTube’s current encoder guidance does not supply a direct SRT endpoint; check Live Control Room rather than constructing one from the channel’s RTMP details.
- Set stream ID and encryption only when required. Larix supports SRT parameters such as stream ID, and Softvelum describes AES encryption support in its SRT product information. Match the receiver’s configuration exactly. Treat stream IDs, passphrases, and YouTube stream keys as credentials: share them securely and reset a YouTube key in Live Control Room if it is compromised.
- Set SRT latency for the contribution link. SRT latency is the recovery window for packet loss, not YouTube’s viewer-latency setting. A larger recovery window can allow more time to recover from network variation, at the cost of added delay. Set it based on measured jitter and loss and the receiver’s requirements; there is no universal value established for every phone, network, or server.
- Choose video bitrate and maximum bandwidth conservatively. Set a video target that fits the codec, resolution, frame rate, device, and sustained upload capacity. Leave capacity for network variation rather than using all measured upload bandwidth. Larix’s bitrate controls differ by platform: Android accepts a typed value, while iOS offers predefined values. The device’s actual encoding behavior may not exactly match its nominal target.
- Set reconnect behavior deliberately. Larix provides a reconnect timeout and a network-presence option. Its FAQ also lists iOS-only controls for reconnecting when there is no network and for idle/unsent buffer thresholds. Use the options available on your device to suit the receiver and connection, but do not treat them as an uptime guarantee.
- Use video and audio together when the program requires both. Softvelum’s Larix guidance says to use video+audio mode for connections and to set a proper bitrate. Confirm that the receiving server expects the selected media tracks.
Choose a YouTube-facing video profile
The following figures are YouTube Help’s current published H.264 encoder guidance, accessed in 2026. They are not guaranteed Larix output rates, nor are they SRT contribution settings. Apply them to the YouTube-facing encoder or relay output as appropriate, and confirm that the complete route can sustain the selected profile.
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| YouTube output profile | Published minimum | Published recommended bitrate |
|---|---|---|
| 720p at 30 fps, H.264 | 3 Mbps | 8 Mbps |
| 1080p at 30 fps, H.264 | 5 Mbps | 14 Mbps |
| 1080p at 60 fps, H.264 | 6 Mbps | 17 Mbps |
YouTube’s encoder guidance also lists H.265 and AV1 video, up to 60 fps, constant bitrate (CBR), and a recommended two-second keyframe frequency with a maximum of four seconds. Audio options listed are AAC or MP3. Match what the selected encoder and any relay actually support; do not assume YouTube-facing recommendations automatically apply to an SRT contribution leg. YouTube’s network tips recommend about 20% bandwidth headroom. Choose a lower resolution or frame rate if the connection cannot reliably carry the target plus that margin.
Test the full route before leaving it unattended
- Prepare representative content. Test with the intended audio and typical motion, not a quiet or static segment if the real program is more demanding.
- Start a private or otherwise appropriate test stream. Confirm the connection in YouTube’s preview and inspect stream health before relying on it for the live channel.
- Check both legs if using a relay. Verify that Larix reaches the relay and that the relay’s YouTube output is also healthy. A successful SRT connection alone does not prove YouTube is receiving a usable stream.
- Observe the device over an extended run. Confirm that power, network access, capture, and the app remain stable under the actual operating conditions. Watch for heat, app suspension, battery or power issues, and changes in network quality.
- Test interruption recovery. Where safe to do so, check what happens after a brief network interruption and confirm that the receiver, relay, and YouTube feed recover as intended. Keep a way to monitor or restart the system.
YouTube’s guidance explicitly says to test before starting a live stream. A successful short test is useful, but it does not establish that a phone can run unattended indefinitely.
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- H.264 & H.265 Streaming to SRT or RTMP
- DCI 4K Streaming up to 60 fps
- SDI & HDMI Monitor Outputs
- USB-C for Phone Tethering & Webcam Out
- Front Panel Buttons & Spin Knob
Plan for 24/7 operation beyond the SRT settings
- Power: use an appropriate, device-compatible supply and verify that it can maintain the device during the intended run.
- Heat and device behavior: check sustained operation on the actual phone and operating system. The cited Larix materials document streaming and reconnect controls, not protection against thermal throttling or app suspension.
- Network: use a stable uplink with margin and plan what happens if the primary connection fails. SRT recovery can help on its contribution link, but does not eliminate outages elsewhere in the route.
- Monitoring: arrange local or remote checks of Larix, the receiver or relay, and YouTube stream health. Reconnect controls help define behavior after a disruption; they do not guarantee continuous operation.
- Stream-key security: YouTube stream keys are used by an encoder to deliver a feed and are managed in Live Control Room. Keep the key private and reset it there if exposed.
Troubleshoot common connection and stream problems
| Symptom | Likely cause | What to check |
|---|---|---|
| Larix cannot connect to the SRT destination | Wrong endpoint, port, mode, stream ID, or passphrase; or the receiver is unavailable | Compare each value with the receiver’s instructions and confirm that its listener is running and reachable. |
| Larix connects, but YouTube shows no feed | The SRT receiver may not be YouTube, or a relay may not be forwarding correctly | Check the channel’s Live Control Room for an available SRT ingest option. If using a relay, inspect its input and YouTube output separately. |
| Video stutters or stream health degrades | Insufficient sustained upload, network variation, or an overly demanding profile | Check YouTube stream health and the actual uplink; reduce resolution, frame rate, or bitrate and preserve bandwidth headroom. For SRT contribution, review loss and jitter and set latency to suit the receiver. |
| Video arrives without audio, or audio is missing at the receiver | Media mode or receiver expectations may not match | Confirm video+audio mode in Larix where appropriate and verify which tracks the receiver accepts. |
| The stream stops after the phone has been running for a while | Power interruption, heat, app suspension, or network loss | Inspect device power and temperature, operating-system background behavior, network continuity, and reconnect settings. Do not assume SRT will address device-level interruptions. |
| The stream does not recover after a brief outage | Reconnect behavior, receiver state, or the relay’s onward connection may need attention | Check Larix’s reconnect options and determine whether the receiver or relay also needs to reconnect. Test the full recovery path before depending on it unattended. |
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