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1Fix the driver behind crashes, sound loss and screen glitches2Repair Windows errors before they cause bigger problems3Scan for outdated or missing drivers - takes under a minuteIf your SRS-to-YouTube stream is silent, first find where the audio disappears: at capture, in FFmpeg’s input or stream mapping, in SRS transcoding, or at YouTube ingest and preview. Changing codecs cannot restore audio that never entered the pipeline. Check each handoff in order, and confirm your SRS version, input and output protocols, and whether SRS is actually running an FFmpeg transcode engine; the right fix depends on those details.
Trace the audio path before changing settings
Think of the stream as a chain: source or capture → FFmpeg input and output → SRS processing → YouTube ingest and preview. Identify the first point in that chain where the audio is missing. A stream reaching YouTube does not prove that its audio track reached YouTube.
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- Check the source. Confirm the intended file or live input contains audio. For live capture, check that the expected microphone, mixer, or desktop-audio input is selected and active.
- Check FFmpeg’s input and output. Review its stream listing and logs, then verify that the output maps audio from the intended input and does not suppress it. With multiple inputs or audio tracks, do not assume FFmpeg selected the right one automatically.
- Check what SRS receives and sends. Determine whether the incoming stream has audio and whether SRS copies, transcodes, or disables that track.
- Check YouTube. Confirm audio in the Live Control Room preview and monitor stream health and messages while live.
Do not begin by changing codec flags: first establish that the output immediately before YouTube contains audio.
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Confirm whether SRS is transcoding
SRS transcoding is optional. In the documented workflow, an encoder publishes RTMP to SRS, which may start FFmpeg to transcode and publish to SRS or another server. A direct FFmpeg publish to SRS may instead copy tracks. Establish which workflow you are using before editing an SRS transcode configuration.
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In the active configuration and generated FFmpeg command or logs, inspect the audio codec (acodec), bitrate (abitrate), sample rate (asample_rate), channel count (achannels), and any additional audio parameters. SRS’s v3 FFmpeg configuration reference illustrates three materially different outcomes:
acodec copypasses through the input audio without encoding. This preserves the input codec, which may not suit the destination.- An AAC encoder transcodes the audio, allowing it to be converted to a destination-compatible format.
acodec andisables audio output, producing a video-only result.
These examples are version-scoped: the configuration reference is for SRS v3, while the separate SRS FFmpeg workflow documentation is archived v5 material. Check the documentation for your deployed SRS version before applying configuration syntax. Do not assume a transcode configuration is active just because it exists; confirm the actual command SRS runs.
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Check FFmpeg mapping and output
FFmpeg must receive the intended audio stream and include it in the output. Inspect the command’s inputs, mapping options, and output options together. If the source has several inputs or tracks, explicitly verify which audio stream is selected. An audio codec setting does not select a missing or unintended input track.
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A free scan shows the junk files, broken settings and background clutter dragging Windows down - then fixes them in one click.Free scan · Windows 10 & 11Use FFmpeg’s stream listing and execution log to confirm the input audio stream and the produced output’s audio stream. If the output has no audio, investigate input selection, mapping, or an audio-disable option before changing sample rate or bitrate. There is no single safe command that applies to every SRS/FFmpeg setup: the correct mapping depends on the actual inputs and destination format.
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Match YouTube audio settings to the output protocol
For YouTube ingest over RTMP or RTMPS, YouTube’s live encoder settings list AAC or MP3 audio. Its recommended advanced settings specify the following:
| Channel layout | Codec guidance | Recommended sample rate | Recommended bitrate |
|---|---|---|---|
| Stereo | AAC or MP3 for RTMP/RTMPS | 44.1 kHz | 128 kbps |
| 5.1 surround | AAC for RTMP/RTMPS | 48 kHz | 384 kbps |
YouTube supports mono, stereo, and 5.1 channel layouts. Other layouts may convert unreliably to stereo, so verify the actual channel layout if audio is missing or behaving unexpectedly. These are YouTube recommendations for the stated ingest protocol, not universal requirements for every SRS output. YouTube recommends RTMPS for transport security; using RTMPS does not itself fix a missing audio track. Check the ingest URL and stream key separately from the audio path.
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Keep SRS HLS issues separate from YouTube RTMP issues
If the affected listener is using SRS HLS delivery, not YouTube RTMP/RTMPS ingest, the relevant checks differ. SRS’s HLS documentation identifies AAC for audio-only HLS and H.264 with AAC or MP3 for its HLS path. It also describes possible audio corruption when timestamps are converted between FLV and MPEG-TS, with an HLS-specific configuration note for hls_dts_directly.
That HLS timestamp note is not a general remedy for silent YouTube RTMP/RTMPS ingest. Apply it only when diagnosing the documented SRS HLS timestamp behavior, and consult the documentation matching your SRS version.
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Verify audio in YouTube Live Control Room
- Before the event, send a representative test with the same audio source, encoding path, and output settings you intend to use.
- Check that the Live Control Room preview has audio, not merely that the stream connects or video appears.
- If preview audio is absent, revisit the source, FFmpeg output, and SRS output boundaries in sequence to find where the track disappears.
- During the event, monitor YouTube’s stream health and messages for problems.
YouTube recommends testing with representative audio and video before going live. A successful connection alone is not proof of a working audio path.
Troubleshoot by symptom
| Symptom | Likely place to check | Next check |
|---|---|---|
| No audio at the source or FFmpeg input | Capture device, selected input, or source file | Confirm the expected microphone, mixer, desktop audio, or file track is active and present before encoding. |
| Input has audio, but FFmpeg output does not | Input selection, stream mapping, or audio suppression | Inspect FFmpeg’s stream listing, mapping, command options, and output log; confirm the produced file or stream contains audio. |
| FFmpeg output has audio, but the SRS transcode output does not | Active SRS transcode configuration or generated command | Check whether transcoding is enabled and inspect acodec; an disables audio, while the wrong mapping or configuration may omit the intended track. |
| Audio is present before YouTube, but missing in its preview | Final codec, channel layout, or ingest handoff | Verify the RTMP/RTMPS audio codec and layout against YouTube’s guidance, then re-check the ingest URL/key and Live Control Room messages. |
| Only SRS HLS playback has audio corruption | HLS codec or FLV-to-MPEG-TS timestamp conversion | Consult the SRS HLS documentation for the version in use; do not apply an HLS-only option as a YouTube RTMP fix. |
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