For a YouTube relay, start with RTMPS where your setup supports it, CBR output, and a 2-second keyframe interval (never more than 4 seconds). Set the encoder’s bitrate for the codec, resolution, and frame rate you actually send, then confirm your upload can sustain it. NGINX RTMP relays the encoder output; it does not make unsuitable video settings compliant or guarantee an uninterrupted 24/7 stream.
Recommended YouTube encoder settings
These are settings for the encoder producing the stream sent through NGINX—not magic NGINX directives. YouTube’s published guidance recommends RTMPS, CBR, and a 2-second keyframe interval, with keyframes no more than 4 seconds apart. YouTube’s encoder guidance lists H.264, H.265/HEVC, and AV1 for RTMP/RTMPS, but the encoder and your installed relay must support the codec you select.
- Transport: Use RTMPS for the upstream connection to YouTube when supported. YouTube recommends it as the secure extension of RTMP.
- Rate control: CBR.
- Keyframes: Every 2 seconds; do not exceed 4 seconds.
- Codec: Choose a codec your sending encoder can produce and your workflow supports. The codec options in YouTube’s guidance are not a guarantee that every encoder or NGINX RTMP build accepts them.
H.264 bitrate examples
YouTube’s current published H.264 recommendations below are tied to the listed resolution and frame rate. They are platform guidance, not guaranteed quality levels; choose a rate your upload connection can sustain reliably.
| Output | Recommended bitrate | Minimum bitrate |
|---|---|---|
| 720p at 30 fps | 8 Mbps | 3 Mbps |
| 720p at 60 fps | 8 Mbps | 3 Mbps |
| 1080p at 30 fps | 14 Mbps | 5 Mbps |
| 1080p at 60 fps | 17 Mbps | 6 Mbps |
These figures are YouTube’s recommendations and minima for H.264—not universal targets for other codecs or settings. Test the available upload bitrate and favor a stable stream over a setting that intermittently exceeds the connection’s capacity. Leave headroom for normal network variation rather than assuming a speed-test peak is continuously available.
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Audio and picture parameters
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What NGINX RTMP settings actually control
NGINX’s RTMP module handles the server-side RTMP workflow. The encoder determines the outgoing codec, bitrate, frame rate, keyframe interval, and audio settings. Changing an NGINX setting such as chunk size or enabling HLS does not, by itself, correct incompatible encoder output or fix every disconnect.
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First establish which NGINX edition, package source, operating system, and RTMP module build you have. The module is not present in every installation by default, and installation instructions differ between NGINX Plus and NGINX Open Source.
NGINX Plus
F5’s NGINX Plus RTMP guide describes installing the nginx-plus-module-rtmp package, loading ngx_rtmp_module.so in the main context, testing the configuration with nginx -t, and reloading with nginx -s reload. These instructions apply to the documented NGINX Plus context; verify package and module compatibility for your installation before using them.
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NGINX Open Source
For NGINX Open Source, the installation guide explains that third-party modules may be compiled statically with --add-module or dynamically with --add-dynamic-module, where supported. The exact build procedure depends on your NGINX version, platform, and module source. Do not assume the NGINX Plus package command applies to an Open Source build.
When HLS directives matter
HLS fragment length, playlist length, playlist type, and output path matter if your server also packages an HLS output. They are not prerequisites merely because the destination is YouTube Live. The community-maintained nginx-rtmp directives reference describes these options; check it against the exact module version you run.
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Bring up and validate the relay
- Confirm the module and build. Identify NGINX edition, version, platform, and whether the RTMP module is installed and loadable before adding RTMP configuration.
- Set the encoder output. Choose RTMPS to YouTube where supported, CBR, a 2-second keyframe interval, and a codec/bitrate combination appropriate to your actual resolution and frame rate.
- Check upload capacity. Test the sending connection and select a bitrate it can sustain with margin. The table above is specific to YouTube’s H.264 guidance.
- Validate configuration before applying it. For the documented NGINX Plus workflow, run
nginx -tbeforenginx -s reload. On other installations, use the compatible configuration-test and reload process for that build. - Run a representative test. YouTube advises testing before going live with audio and movement similar to the intended stream. Check the stream health messages rather than assuming a successful NGINX reload proves the feed is healthy.
- Monitor after launch. Watch YouTube’s stream health and investigate warnings or interruptions. Plan how your deployment will recover from encoder, network, server, or ingest failures; exact retry and failover behavior depends on the NGINX RTMP and encoder versions and configuration.
24/7 reliability: what settings cannot promise
No single NGINX configuration guarantees continuous service. The available official guidance provides encoder parameters and recommends testing and monitoring, but it does not establish a universal reconnect recipe, capacity plan, network redundancy design, or uptime level for a 24/7 NGINX relay. Treat recovery as an operational design problem: test failure scenarios, know which component stopped, and verify that the stream resumes correctly instead of relying on an assumed generic retry directive.
- If YouTube reports poor stream health, compare the actual outgoing bitrate, keyframe interval, audio, and resolution against the encoder settings and connection capacity.
- If NGINX rejects the configuration or cannot load the module, check that the module matches the installed edition/build and that it is loaded in the correct context.
- If local HLS output is not needed, omit HLS-specific configuration rather than treating it as a requirement for YouTube ingest.
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Frequently Asked Questions
Does installing NGINX automatically give me RTMP support?
No. RTMP module availability depends on the NGINX edition and build; check the module documentation for your installation.
Does YouTube’s H.264 bitrate table apply to HEVC or AV1?
No. The figures shown here are specifically YouTube’s H.264 recommendations for the listed resolutions and frame rates.
Quick Recap
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