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First determine whether the audio/video mismatch stays roughly the same or grows over time. A nearly constant offset calls for measuring and shifting the affected input; growing drift calls for checking source clocks and whether audio samples keep pace with their timestamps. Do not start by adding arbitrary delays or forcing a frame rate: either can hide the symptom or create new artifacts.
Also compare the FFmpeg output before YouTube ingest with the Live Control Room preview and playback. If the local output is synchronized but YouTube playback is not, investigate stream health and delivery before changing timestamp filters.
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1. Capture the evidence before changing FFmpeg
Save the exact FFmpeg command, but redact the YouTube stream key anywhere it appears. Record the output of ffmpeg -version, relevant startup and runtime log lines, the input types, and whether audio and video come from one file or separate live sources. Do not post a stream key publicly or include it in a support request.
Use ffprobe or FFmpeg logs to inspect the inputs and output where possible. Note stream start times, time bases, frame rates and audio sample rates. Then identify a clear event visible and audible in the stream—such as a clap—and estimate the audio/video offset near the beginning and again later. Record which leads and by approximately how much.
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Two observations matter more than an unmeasured impression: if the separation is similar both times, the problem is probably a fixed offset; if it increases or changes abruptly, look for clock or timestamp progression issues. This classification helps choose a correction, but it does not identify the root cause by itself.
2. Find out whether the mismatch is already in FFmpeg’s output
Compare a local recording or capture of the FFmpeg output with the YouTube Live Control Room preview and, when available, the resulting playback. Use the same sync event in each. If the local output is already out of sync, focus first on inputs, timestamps and FFmpeg’s handling. If local output is synchronized but the YouTube result is not, check YouTube stream health, delivery and playback conditions before rewriting the command.
Test before relying on the stream. YouTube recommends testing with audio and movement similar to the real broadcast, then monitoring stream health and messages in Live Control Room. A preview or playback discrepancy alone does not prove that timestamp filters are at fault.
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3. Match the correction to the symptom
Nearly constant offset: measure, then shift the affected input
If one input is consistently early or late, measure the offset and identify which input is wrong relative to the other. FFmpeg’s -itsoffset adds an offset to input timestamps; a positive value delays that input. Put the option before the -i for the input it should affect, for example:
ffmpeg [options] -itsoffset MEASURED_OFFSET -i affected-input [options] -i other-input [output options] OUTPUT
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Replace MEASURED_OFFSET with the value established by your measurement and use a sign that corrects the observed lead or lag. This is a command shape, not a recommended delay value. Re-run a test and compare the same event near the start and later. If the mismatch grows, a fixed shift will not correct the underlying drift.
Growing drift: check whether the sources share a clock
When audio and video come from separate live sources, establish how each source timestamps its data and whether those clocks are related. FFmpeg notes that expected synchronization behavior depends on the timestamps for two inputs deriving from the same clock source. Independent capture devices or processes can progress at slightly different rates even when they begin together.
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1Scan for outdated or missing drivers - takes under a minute2Repair Windows errors before they cause bigger problems3Fix the driver behind crashes, sound loss and screen glitchesCheck whether audio samples progress in step with their timestamps. FFmpeg’s aresample filter can compensate by stretching or squeezing audio, or by adding or cutting samples to match timestamps. Use compensation only after the evidence points to an audio-sample/timestamp mismatch, and test it in a controlled run using documentation for the FFmpeg build installed on the Hetzner host. Incorrect or excessive compensation can alter audio; do not select a value by guesswork or assume the filter fixes every clock mismatch.
Sudden jumps or discontinuities: locate the timestamp change
If sync is acceptable and then jumps, inspect logs and source behavior around the jump. Look for an input interruption, restart, timestamp discontinuity or other event that affects one input. Determine which input’s timestamps changed before applying a correction. A broad reset or offset may mask an interruption without restoring stable timing.
Irregular video cadence: review the frame-sync policy
Check the source frame rate and the output frame-sync mode rather than treating a frame-rate conversion as an audio repair. FFmpeg’s modes have different effects:
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- Passthrough: preserves demuxer timestamps.
- Constant frame rate (CFR): duplicates or drops frames to meet the requested rate.
- Variable frame rate (VFR): passes timestamps through or drops frames with duplicate timestamps.
Choose based on the source cadence and output requirement. Forcing CFR can change the video by adding or dropping frames; it is not a blanket audio/video synchronization fix. Check the installed build’s FFmpeg documentation for the applicable option names and behavior.
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Verify encoder settings against YouTube’s current guidance
YouTube’s encoder guidance recommends RTMP or RTMPS ingestion, a frame rate up to 60 fps, a two-second keyframe interval (not over four seconds), AAC or MP3 audio, and constant bitrate (CBR). These are platform recommendations, not proof that a particular timing error is caused by encoder settings. Confirm the current requirements for your chosen resolution, frame rate and codec in YouTube Live Control Room before a production stream.
For H.264, YouTube’s published examples recommend 10 Mbps for 1080p30 and 17 Mbps for 1080p60; its table also lists 8 Mbps for both 720p30 and 720p60. The appropriate bitrate depends on resolution, frame rate and codec, and YouTube may update its table, so use the current entry for your actual output rather than treating an example as a universal setting.
RTMPS encrypts the ingest connection. YouTube provides instructions for obtaining the RTMPS URL in Live Control Room. Choosing RTMPS concerns transport security and connection setup; it does not correct timestamps or independently resolve lip-sync.
Check total bitrate and available outbound capacity
Add the bitrate of the primary stream and any backup stream, then compare that total with measured outbound capacity from the relevant Hetzner server and network allocation. YouTube recommends leaving 20% headroom beyond the total stream bitrate. Check actual throughput and allocation for your own account, server and region; a provider name alone does not establish the bandwidth available to a particular host.
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Insufficient or unstable bandwidth can disrupt delivery, but a bandwidth check does not prove the cause of a timestamp offset. Treat delivery health and synchronization as related checks, not interchangeable diagnoses.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.5. Run a controlled test and keep a known-good version
- Make a short test stream. Use a private or unlisted test where permitted, with representative audio and motion and a visible, audible sync event such as a clap.
- Change one relevant setting at a time. If the evidence shows a fixed offset, test a measured input shift. If it shows sample/timestamp divergence, test audio compensation. If frame cadence is the issue, test the appropriate frame-sync policy.
- Compare at two points. Check the event near the beginning and later in the test, both in local output and in YouTube’s preview or playback where available.
- Save the result. Keep the known-good command, FFmpeg logs and YouTube stream-health messages together. Redact stream keys before storing logs somewhere shared or sending them for help.
6. Common failure patterns and what to do
| What you observe | What to check next | What to avoid |
|---|---|---|
| The same audio lead or lag persists throughout. | Measure which input leads, then test a corresponding -itsoffset before that input’s -i. |
Guessing a delay without measuring, or shifting the wrong input. |
| The mismatch gets larger over time. | Check whether separate sources share a clock and whether audio samples track their timestamps; consider controlled aresample compensation only if indicated. |
Expecting a fixed timestamp shift to stop accumulating drift. |
| Sync jumps after being acceptable. | Inspect logs and source interruptions or timestamp discontinuities near the change; find the input that changed. | Using a general timestamp reset to conceal the source event. |
| Video motion looks uneven or frame timing varies. | Check source frame rate and the chosen passthrough, CFR or VFR behavior. | Forcing CFR as a universal audio-sync remedy. |
| Local output is synchronized, but the YouTube result is not. | Review Live Control Room status and stream-health messages, then investigate delivery and playback conditions. | Changing FFmpeg filters before establishing that the defect exists in the local output. |
| The stream drops, buffers or reports health problems. | Compare total primary and backup bitrate with observed outbound capacity, leave YouTube’s recommended 20% headroom, and review the current encoder guidance. | Assuming a delivery issue alone explains a stable timestamp offset. |
7. Keep the YouTube stream compliant
Only stream video and audio you have the rights and permissions to use. A successful test or healthy ingest does not establish that the content is permitted. If the channel is monetized, review YouTube’s current policies on copyright and reused content for your situation; the fixes in this guide address timing and delivery, not content eligibility.
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