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To send GStreamer video and audio to YouTube Live, encode video as H.264 and audio as AAC, parse the H.264 into AVC format, connect both streams to flvmux, then send the FLV output through an RTMP- or RTMPS-capable sink. Prefer RTMPS, use constant bitrate (CBR), and target a two-second keyframe interval. The exact source elements, plugins and sink depend on your installation, so validate the pipeline locally rather than assuming one command works everywhere.
How the GStreamer pipeline fits together
The video and audio branches are encoded separately, then joined at the muxer. flvmux creates FLV output; it does not connect to YouTube by itself. An RTMP(S)-capable sink must deliver that output to the ingest address and stream key shown in YouTube Live Control Room.
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 keyFor a documented AAC encoder example, use voaacenc in place of “AAC encoder.” The x264enc documentation describes H.264 encoding; h264parse can output AVC; voaacenc encodes AAC and accepts common rates including 44.1 and 48 kHz; and flvmux expects AVC-formatted H.264 on its video sink.
The ellipses are deliberate: source elements, encoder choices, sink availability, and sink URI syntax vary by machine and build. Check which elements are installed and inspect negotiated caps. Configure the sink with the ingest details copied from Live Control Room; YouTube recommends RTMPS and explains where to obtain the stream key in its RTMPS guidance.
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Set encoder values for YouTube Live
Transport, video codec and rate control
YouTube accepts H.264 video and AAC audio over RTMP or RTMPS, and recommends RTMPS for secure transport. Its encoder guidance specifies CBR. Choose the video bitrate for the output resolution and frame rate, while leaving network capacity for audio and transport overhead. The following are YouTube recommendations—not guaranteed quality levels or universal minimums:
| Output | YouTube H.264 bitrate recommendation |
|---|---|
| 720p at 30 fps | 8 Mbps |
| 1080p at 30 fps | 14 Mbps |
| 1080p at 60 fps | 17 Mbps |
These figures are from Google’s YouTube encoder settings guidance, current in 2026. Consult its full bitrate table for other resolutions and frame rates.
Rank #2
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Keyframe interval
YouTube Help says: “Keyframe frequency: Recommended 2 seconds Do not exceed 4 seconds”. For x264enc, key-int-max is a frame count, not a number of seconds. At 30 fps, a two-second interval is approximately 60 frames; at 60 fps, it is approximately 120. Set the count to match the actual output frame rate, then confirm the resulting stream behavior. See the x264enc property reference and YouTube’s keyframe guidance.
AAC audio
YouTube recommends 44.1 kHz for stereo and 48 kHz for 5.1 surround sound. Its listed audio bitrates are 128 Kbps for stereo and 384 Kbps for 5.1. Over RTMP/RTMPS, YouTube supports 5.1 audio only with AAC. Ensure the audio branch actually negotiates the intended channel layout and sample rate rather than relying on the source defaults.
Rank #3
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Build and validate the pipeline
- Check installed elements. Confirm that your GStreamer build includes the chosen source,
x264encor another H.264 encoder,h264parse, an AAC encoder such asvoaacenc,flvmux, and an RTMP(S)-capable sink. The required plugins may be packaged separately, and local builds differ. - Prepare the video branch. Convert the source to a format accepted by the encoder, encode H.264, then pass it through
h264parse. Verify that the parser negotiatesvideo/x-h264,stream-format=avcbefore the branch reaches the muxer. If the muxer rejects the video caps, this is the first negotiation point to inspect. - Prepare the audio branch. Convert and resample the source as needed, encode AAC, and check the negotiated sample rate and channel layout. Use values appropriate to the intended stereo or 5.1 output.
- Join the branches with queues. Put a queue on each encoded branch before linking it to
mux. Test with the real sources: H.264 encoder latency can exceed a simple queue’s defaults, allowing one branch to block while another queue fills. - Configure the muxer and destination. Set
streamable=truefor streaming-friendly FLV output, then configure the installed RTMP(S) sink with the ingest URL and stream key from Live Control Room. The precise sink element and URI syntax are installation-specific. - Test before the event. YouTube recommends a test with audio and movement similar to the planned event. Check Live Control Room’s stream health and messages while testing, and verify the delivered audio, picture, bitrate and keyframe cadence.
The streamable property omits indexes and duration from the FLV output. The muxer also documents timestamp-related controls such as enforce-increasing-timestamps and skip-backwards-streams; these do not replace correct timestamp handling upstream. See the flvmux reference.
Fix common pipeline failures
- flvmux rejects the H.264 branch: Inspect caps after
h264parse. The muxer’s H.264 input expects AVC stream format, so ensure the branch negotiatesstream-format=avc. - The pipeline stalls or one branch stops: Encoder buffering can outlast a queue’s default limits. Increase the non-video queue limits or use one
multiqueue, then test under realistic source conditions. GStreamer’s x264enc documentation describes this latency issue; Basic tutorial 10 covers GStreamer tools and pipeline behavior. - Live latency is too high:
x264enc tune=zerolatencycan help in some live scenarios, but it trades away quality. Compare the result using the actual content and target settings rather than treating it as a universal fix. - The parser’s parameter-set behavior needs adjustment:
h264parse‘sconfig-intervalcontrols SPS/PPS insertion;-1inserts them with every IDR frame. Do not set it automatically—change it only when a diagnosed compatibility need calls for it. See the parser reference. - YouTube does not receive the stream: Confirm that the stream key and ingest address match the current Live Control Room details, that the sink supports the configured RTMP or RTMPS destination, and that the network allows the connection. Check the sink’s own error output because its exact behavior and URI syntax depend on the installed element.
- Stream health reports instability: Check the configured CBR bitrate against the connection’s available capacity, including audio and overhead. Verify that the output frame rate matches the keyframe frame-count calculation, then review Live Control Room messages.
Copyright and YouTube channel rules
Technical compatibility does not grant permission to broadcast the material. Before sending a documentary, soundtrack, archive clip or other recording, confirm that you have the rights or permission needed for a live YouTube broadcast. YouTube’s encoder settings do not determine whether a channel qualifies for monetization or whether reused material meets its policies; check the current YouTube rules for the content and channel rather than treating a successful ingest as approval.
Rank #4
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Quick Recap
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