If audio is in sync at first but gradually slips against the video, suspect a timing problem—not simply a delay. Check for mismatched audio-device sample rates, buffering or timestamp warnings, and high system load. If the mismatch stays constant, it may be a fixed offset; if it grows over time, adding more delay usually chases the symptom rather than fixing its cause.
First determine what kind of sync problem you have
Compare the same visible and audible event at the start of the stream and after the mismatch becomes noticeable. Make a short local recording at both points if possible, then compare those recordings with YouTube playback. This helps distinguish a problem in the stream being produced from delay or buffering in playback.
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- Fixed offset: Audio is consistently early or late by roughly the same amount. A sync offset may help once you confirm where the offset enters the signal path.
- Accumulating drift: The mismatch becomes progressively larger. Investigate clocks, sample rates, buffers, timestamps, and system load before adjusting sync delay.
- Intermittent or viewer-specific delay: Compare local recording and YouTube playback, and check stream health. Playback buffering or delivery latency can make a stream appear late without proving that audio is progressively slipping relative to video.
OBS community guidance distinguishes a fixed offset from drift that accumulates over time; treat that distinction as a diagnostic guide, not a diagnosis without evidence from your setup. OBS community discussion of audio sync.
Check audio sample rates across the complete signal path
In OBS and your operating system’s sound settings, check the configured sample rate for every active audio device and source path. A mismatch between devices can be associated with drift over time or distortion, according to the OBS Analyzer guidance. Use a consistent supported rate as a diagnostic baseline, rather than assuming that changing one setting will solve every clock or device-timestamp problem.
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YouTube’s ingest guidance recognizes 44.1 kHz and 48 kHz as recommended audio sample rates. For ordinary live ingestion, YouTube also identifies AAC audio among its recommended settings; check the health message for your actual stream and ingest mode rather than applying one format rule to every mode. YouTube Live stream health and ingest guidance.
Inspect OBS warnings, load, and connection health
Review the OBS log or analyzer output and stream statistics around the time the problem starts. Look for sample-rate mismatch, maximum audio buffering, incorrect device timestamps, high CPU or GPU load, and dropped frames. The analyzer describes maximum audio buffering as a possible sign of very high system load; it can affect latency or cause an individual source to stop working. Incorrect device timestamps can also be relevant. These are clues, not proof that any one cause applies to your stream. OBS Analyzer.
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Dropped frames point to connection stability or available bitrate capacity, according to OBS; viewers can also experience buffering even when the encoder reports no dropped frames. Compare a local recording with YouTube playback and check the OBS connection troubleshooting guidance alongside the stream health information in YouTube Live Control Room.
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In YouTube Live Control Room, check the stream health indicator and any error messages, including their timestamps. YouTube’s error guidance covers unsupported formats, audio settings and sample-rate issues, keyframe problems, and video starvation. Resolve the reported issue rather than changing unrelated settings; the error may persist while the underlying problem remains. YouTube Live streaming error messages.
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For ordinary ingestion, YouTube’s guidance includes H.264 video and AAC audio, and flags incorrect audio configuration and keyframe frequency. Follow the settings and warnings for your selected ingest mode: YouTube HLS has separate configuration guidance and permits additional codecs. YouTube’s live error guidance.
Do not confuse stream latency with audio drift
Latency is the time between capture and display. YouTube explains that the player’s read-ahead buffer is a main source of stream latency; reducing it can make viewers more vulnerable to buffering. Network congestion can also delay playback even when average bandwidth looks adequate. These issues can make a stream feel late, but do not by themselves establish that audio is progressively moving out of sync with video. YouTube: Understand live streaming latency.
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YouTube says HLS has higher delivery latency than continuous RTMP because HLS sends video in segments. HLS segment-duration settings affect delivery latency; they are not a fix for mismatched clocks or device timestamps. YouTube: Set up an HLS stream.
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Change settings methodically
- Record or otherwise compare the stream near its start and again after the mismatch appears. Use the same identifiable audio-and-video event where possible.
- Classify the symptom as fixed, steadily accumulating, intermittent, or limited to some viewers. Note whether it appears in the local recording, YouTube playback, or both.
- Check OBS and operating-system sample rates for every active audio device. Review OBS logs or analyzer output for buffering and timestamp warnings, and check system load and dropped frames.
- Check YouTube Live Control Room for health messages and their timestamps. Use the message that matches your ingest mode and actual error.
- Change one relevant setting at a time, then make another recording and compare it. Try an offset adjustment only for a confirmed fixed offset; for growing drift, address the timing, buffering, or timestamp behavior first.
OBS’s backend documentation describes timestamped video and audio sources entering buffers, with audio resampled or remixed when sample rate or channel count differs. That is a reason to inspect the whole source path when timing differs; it does not mean every 24/7 stream will drift or that resampling itself is necessarily failing. OBS Studio Backend Design.
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Common symptoms and what to check
| What you notice | What to investigate |
|---|---|
| The offset is present from the beginning and stays similar. | Confirm whether it appears in a local recording or only in YouTube playback. If it is a stable production offset, consider an offset adjustment after locating the affected source path. |
| Audio and video start together, then separate more over time. | Check every active device’s sample rate, OBS buffering and timestamp warnings, and system load. Do not keep increasing a delay to chase a growing mismatch. |
| The local recording looks right, but YouTube playback seems late or buffers. | Check YouTube stream health, dropped frames, connection stability, and the selected latency or ingest mode. Playback delay is not on its own proof of audio drift. |
| Only one source or device seems affected. | Inspect that source’s route, device settings, and timestamps rather than changing all audio delays at once. |
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