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To send a GStreamer stream to YouTube Live, encode video as H.264 and audio as AAC, parse the H.264 into AVC format, connect both branches to flvmux, then send the muxed FLV output through an RTMP- or RTMPS-capable sink. YouTube recommends RTMPS, constant bitrate (CBR), and keyframes every two seconds; do not let the interval exceed four seconds.
How the pipeline fits together
flvmux combines encoded audio and video into an FLV stream; it does not capture, encode, or deliver media by itself. A typical live pipeline has a video branch and an audio branch feeding the muxer, followed by a sink configured with the YouTube ingest address and stream key.
video source ! videoconvert ! x264enc ... ! h264parse ! video/x-h264,stream-format=avc ! queue ! mux.
audio source ! audioconvert ! audioresample ! AAC encoder ! queue ! mux.
flvmux name=mux streamable=true ! RTMP(S)-capable sink configured with the YouTube ingest URL and stream keyThis is a pipeline shape, not a copy-and-run command: source elements, encoders, installed plugins, and the RTMP(S) sink vary between systems. Check which elements are installed and inspect the negotiated caps on your own machine before relying on the pipeline.
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- In YouTube Live Control Room, create or open the intended live stream and copy its ingest URL and stream key. Keep the key private; anyone who obtains it may be able to send video to your stream.
- Use the endpoint and key shown in Live Control Room to configure your RTMP(S)-capable sink. YouTube recommends RTMPS for secure transport. Its guidance covers RTMP and RTMPS and lists H.264 video and AAC audio as supported codecs. See YouTube’s RTMPS instructions.
- Select the output resolution and frame rate, then use YouTube’s corresponding H.264 bitrate guidance and CBR rate control. Leave network capacity for audio and transport overhead rather than allocating the entire connection to video.
- Set the keyframe interval near two seconds and never above four seconds. YouTube’s encoder guidance states: “Keyframe frequency: Recommended 2 seconds Do not exceed 4 seconds”.
- Configure audio for the intended channel layout. YouTube recommends 44.1 kHz for stereo and 48 kHz for 5.1 surround sound; its guidance lists 128 Kbps for stereo and 384 Kbps for 5.1. Over RTMP/RTMPS, YouTube supports 5.1 audio only with AAC.
For specific H.264 examples, YouTube’s current encoder table recommends 8 Mbps at 720p30, 14 Mbps at 1080p30, and 17 Mbps at 1080p60. These are Google / YouTube recommendations published in 2026, not guaranteed quality levels or universal minimums. Use the full YouTube bitrate and encoder settings table for other resolutions and frame rates.
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Build the video and audio branches
Video: encode H.264 and parse to AVC
Convert the source to a format accepted by your encoder, encode it as H.264, then pass it through h264parse. The caps immediately after the parser should negotiate video/x-h264,stream-format=avc, which is the H.264 format expected by flvmux. If the muxer rejects video caps, inspect the parser’s actual output rather than assuming the requested caps were negotiated.
With x264enc, key-int-max is a frame count, not a duration. For a two-second interval, set it to about twice the output frame rate: for example, 60 frames at 30 fps. Confirm that the source and output frame rates match your calculation. The x264enc documentation describes its properties and latency considerations.
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Audio: encode AAC
Convert and resample the audio before the AAC encoder so its input format and rate are supported. For an example encoder, GStreamer’s voaacenc is part of the Bad Plug-ins package and accepts common sample rates including 44.1 kHz and 48 kHz. The voaacenc reference lists its caps. Substitute another installed AAC encoder if needed, and verify its output caps.
Check elements and plugin availability
GStreamer elements come from different plugin packages, and distributions may package or build them differently. Confirm that your installation provides the source, conversion, encoder, parser, muxer, and sink elements you plan to use. The relevant references describe x264enc, h264parse, voaacenc, and flvmux; use local inspection to establish what is available and how your sink accepts its destination.
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Connect branches through flvmux and send the stream
Use a separate queue on each branch before the muxer so audio and video can progress independently. Set streamable=true on flvmux for streaming-friendly FLV output; this omits indexes and duration. The muxer’s H.264 input expects AVC stream format. Its documentation also describes timestamp-related controls, but these do not replace correct timestamps from upstream sources.
Configure the final sink with the ingest details from Live Control Room. The exact RTMP(S) sink element, property names, and URI syntax depend on the installed GStreamer build; do not assume a sink or URI form based on another machine’s example. Start the pipeline and check both GStreamer errors and YouTube’s stream preview/health indicators before going live to viewers.
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Handle latency, caps, and timestamp problems
A branch stalls or the pipeline blocks
x264enc can buffer frames and introduce more latency than a default queue accommodates. If one branch blocks while the other queue fills, raise the non-video queue limits or use a multiqueue, then test with the real sources and settings. GStreamer notes that tune=zerolatency can help some live cases, but it trades away quality; it is not a universal fix. See the x264enc documentation and GStreamer Basic tutorial 10.
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flvmux rejects the H.264 branch
Check the negotiated caps between h264parse and flvmux. The output must be AVC format, not merely H.264 in an arbitrary stream format. The parser’s config-interval controls SPS/PPS insertion; -1 means insertion with every IDR frame. Change it only when your pipeline or receiver requires that behavior, not as a blanket remedy.
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Timestamps move backwards or appear inconsistent
Check timestamps at the sources and throughout both branches first. flvmux provides enforce-increasing-timestamps and skip-backwards-streams behavior controls, but they are not substitutes for valid upstream timing. Consult the flvmux property reference before changing them.
YouTube does not receive a healthy stream
- Confirm the ingest URL and key match the stream currently open in Live Control Room.
- Verify that the sink is using the expected RTMP or RTMPS endpoint and that the connection can reach it.
- Check YouTube’s stream health messages, the negotiated video/audio caps, bitrate, and keyframe interval.
- Test with audio and movement similar to the planned event, then monitor stream health during the event. YouTube recommends testing ahead of time and reviewing its messages.
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Quick Recap
Test before the event
- Run the complete pipeline with the actual sources, encoders, and sink you intend to use.
- Confirm the mux receives AVC H.264 and AAC, and that the chosen bitrate and keyframe cadence match the YouTube settings for your output.
- Check the stream preview, audio, motion, and health indicators in Live Control Room; resolve warnings before sharing the live link.
- During the event, monitor YouTube’s health messages and the GStreamer process and logs so a connection or pipeline failure is visible promptly.
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