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1. Check whether FFmpeg receives audio
Run your usual FFmpeg command and inspect the log. After each Input #... line, look for a stream description containing Audio:. If the input has no audio stream, changing output mapping or YouTube settings cannot create one.
- If there is no
Audio:line, check that the command opens the intended input, and investigate the selected capture device, source application’s audio routing, or other source path. - If an audio stream is listed, note which input and stream contain the sound you want. You will need to map that stream if using manual stream selection.
FFmpeg documents -map for manual stream selection and -an as an output option that disables audio recording, including automatic audio selection. See the FFmpeg documentation.
2. Check what FFmpeg sends to YouTube
Compare the input listing with the output stream listing in the log. If the input has audio but the output does not, inspect the full command for an output-scoped -an, missing or incorrect -map options, a wrong input index, or filtergraph outputs that do not include the audio you expect. FFmpeg options apply to outputs according to their position and command structure, so check the whole command rather than just one fragment.
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Map the intended audio stream
If the first audio stream of the first input is the one you want, the mapping is -map 0:a:0. In a command with multiple inputs, replace the leading input number with the index containing the intended audio. Adapt the mapping if filters change the streams available to the output.
This illustrative RTMP/RTMPS command shows explicit video and audio mapping and AAC audio encoding. It is a pattern, not a tested command; replace the input, video settings, server URL, and stream key with your actual values. Keep your stream key private, and make sure no later output-scoped -an disables audio.
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ffmpeg -i INPUT -map 0:v:0 -map 0:a:0 -c:v libx264 -c:a aac -ar 44100 -b:a 128k -f flv "rtmps://SERVER/STREAM_KEY"For a configured multi-input or filtered command, do not copy the example blindly: map the audio stream that actually carries your sound.
3. Match the audio settings YouTube expects
For RTMP/RTMPS live ingestion, YouTube lists AAC or MP3 audio. Its encoder guidance recommends 44.1 kHz and 128 Kbps for stereo audio. For 5.1 audio, it lists 48 kHz and 384 Kbps; 5.1 over RTMP/RTMPS is supported only with AAC. YouTube’s general RTMP/RTMPS video guidance lists H.264, H.265 (HEVC), or AV1 and recommends CBR encoding, a two-second keyframe interval, and no more than four seconds between keyframes. See YouTube’s live encoder settings.
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Use the Live Control Room’s actual health message to focus troubleshooting. YouTube’s live streaming error messages include checks for an unsupported audio codec, no audio stream, multiple audio streams, incorrect sample rate or bitrate, and too many audio channels. The error guidance for that channel-count issue specifies mono or stereo—one or two channels. Do not change unrelated video settings when the reported error points to audio.
4. Test the stream end to end
- Before a public event, run a private or unlisted test that includes real audio and movement similar to the planned stream.
- Listen to the Live Control Room preview and check its stream health messages.
- Verify playback on the live page as well, so you can distinguish an encoder-output issue from an ingestion, preview, or viewer-playback issue.
YouTube recommends testing with audio and movement similar to the planned stream, monitoring stream health, and reviewing its messages. A successful local output alone does not confirm that audio is being ingested or heard on the live page.
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Troubleshoot by where the audio disappears
| What you find | What to check next |
|---|---|
No Audio: line in the input listing |
Check the selected input, capture device, and source application’s audio routing. FFmpeg cannot map an audio stream that is absent from its input. |
| Input lists audio, but output does not | Inspect output-scoped -an, manual mappings, input indices, and filtergraph outputs. Explicitly map the intended audio stream. |
| Output lists audio, but YouTube reports an audio error | Use the Live Control Room message to check the audio codec, number of audio streams, channel count, sample rate, and bitrate against YouTube’s guidance. |
| Audio is present but sounds silent | Check source levels and routing, then listen to a local recording or monitor output if your workflow supports it. A listed audio stream does not establish that it contains audible sound. |
| Audio works locally but not on the live page | Compare the Live Control Room preview and health messages with test-stream playback before changing an encoder that produces working local audio. |
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