First determine whether the audio/video error is a nearly constant offset or grows as the stream runs. A fixed offset may call for shifting the affected input’s timestamps; growing drift points instead to timestamp progression or clock mismatch. Check where the problem first appears before changing your FFmpeg command: a YouTube-only playback issue is different from audio and video already out of sync in FFmpeg’s output.
Start by measuring the sync problem
Do not begin by adding a guessed delay or forcing a new frame rate. Compare a clear, visible event—such as a clap, a door closing, or a spoken cue aligned with an on-screen action—near the beginning of the stream and again later. Note which comes first and estimate the displacement at both points.
- Similar displacement at both observations: the error is probably a fixed offset. Measure which stream leads and by how much.
- Increasing displacement: the error is drifting. Investigate whether audio samples and timestamps progress together and whether separately captured audio and video share a clock.
- Sudden jumps: look for an input interruption, timestamp discontinuity, or change in the affected input rather than applying a broad reset.
- Irregular motion or cadence: inspect the source frame rate and FFmpeg’s output synchronization mode.
These patterns narrow the investigation; they do not identify the cause by themselves. The actual cause depends on the command, FFmpeg build, inputs, timestamps, logs, and whether the defect is present before YouTube receives the stream.
Capture the evidence before editing the command
Save the exact FFmpeg command privately, replacing the YouTube stream key with a placeholder before sharing it. A stream key grants access to your broadcast; never post it in a forum, log excerpt, or support request. Record the FFmpeg version and gather the information below.
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- Run
ffmpeg -versionand keep the output. FFmpeg options and behavior can vary by installed build. - Record the type of each input: one file containing both audio and video, separate files, or independently captured live audio and video.
- Keep startup and runtime log lines around the point where sync changes or an input is interrupted.
- Use
ffprobeor equivalent stream inspection to examine stream start times, time bases, frame rates, sample rates, and timestamps where available. - Write down the two sync observations, including which stream leads and the elapsed time between observations.
Preserve a known-good version of the command before each test. Change one relevant setting at a time so that a result can be attributed to a specific change.
Find out whether the fault is in FFmpeg or YouTube playback
Compare the FFmpeg output with the YouTube Live Control Room preview and, if available, the resulting playback. If audio and video are already misaligned in a local recording or capture of FFmpeg’s output, focus first on the inputs, their timestamps, and FFmpeg’s handling. If the local output is synchronized but the YouTube preview or playback is not, check stream health and ingest conditions before rewriting timestamp filters.
YouTube recommends testing before a live broadcast with representative audio and movement, then monitoring stream health and its status messages. This separates a visible sync defect from delivery interruptions that may make a stream appear unstable.
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Correct a measured, fixed offset with an input timestamp shift
FFmpeg’s -itsoffset adds an offset to input timestamps. A positive value delays that input. Use it only after establishing which input leads and measuring the fixed displacement; do not use an arbitrary value as a general sync fix.
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- Identify the input whose timing needs to move, and measure the required shift in seconds.
- Place
-itsoffset MEASURED_SECONDSbefore the-ifor that input. ReplaceMEASURED_SECONDSwith the measured offset; it is an explanatory placeholder, not a literal command value. - Make no unrelated changes to frame-rate policy, audio filtering, or bitrate during this test.
- Repeat the beginning-and-later sync comparison in a short test stream. If the error is no longer constant or the result worsens, restore the previous command and reassess which stream is leading.
For separately captured live sources, FFmpeg’s expected synchronization depends on the two inputs’ source timestamps deriving from the same clock. If the audio and video sources use independent clocks, a one-time timestamp shift can align them initially without preventing later drift.
Investigate growing drift and audio sample timing
When the gap grows, inspect the relationship between audio sample progression and audio timestamps, as well as the relationship between the audio and video clocks. A stream can begin in sync yet drift if independently captured sources do not maintain a shared clock relationship or if samples do not follow their timestamps.
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FFmpeg’s aresample filter can compensate for audio/timestamp differences by stretching or squeezing audio, or by adding or cutting samples to match timestamps. Treat this as a measured correction to test, not a universal remedy: inappropriate or excessive compensation can degrade audio. Establish that audio samples and timestamps are diverging before trying compensation, then check both sync and sound quality over time.
If audio and video come from a single recording, inspect its stream start times and timestamp progression before assuming that a separate-clock problem applies. If they are separate live sources, establish how each source timestamps its output and whether those clocks are related. The available evidence cannot prescribe a compensation amount for an unspecified stream.
Choose the video synchronization mode deliberately
FFmpeg’s output synchronization modes behave differently; forcing constant frame rate is not a blanket audio-sync fix.
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| Mode | Timestamp behavior | When to examine it |
|---|---|---|
| Passthrough | Preserves demuxer timestamps. | When you need to determine whether timing irregularities originate in the input timestamps. |
| Constant frame rate (CFR) | Duplicates or drops frames to meet a requested frame rate. | When a constant output cadence is an intentional requirement and its frame changes have been considered. |
| Variable frame rate (VFR) | Passes timestamps or drops frames with duplicate timestamps. | When the source timestamps should be retained rather than converted to a fixed cadence. |
Review the source cadence and the actual output mode before changing it. CFR can alter the video by adding or dropping frames; it does not, by itself, prove or repair an audio clock mismatch. Check the installed FFmpeg build’s documentation for the exact option names and behavior supported by that build.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Check YouTube ingest settings and delivery separately
Once the local output is understood, verify the encoder settings and inspect YouTube’s stream-health messages. YouTube’s guidance is platform advice, not proof that a particular setting caused a timestamp offset.
- Protocol: YouTube recommends RTMP or RTMPS ingestion. RTMPS encrypts the connection; changing transport affects connection security and setup, not timestamp synchronization.
- Frame rate: YouTube’s encoder guidance supports up to 60 fps.
- Keyframes: the recommended interval is 2 seconds and should not exceed 4 seconds.
- Audio and rate control: the guidance lists AAC or MP3 audio and constant bitrate (CBR).
- Video bitrate: recommendations vary by resolution, frame rate, and codec. For H.264, YouTube lists 10 Mbps for 1080p30, 17 Mbps for 1080p60, 8 Mbps for 720p30, and 8 Mbps for 720p60. These are YouTube recommendations, not universal minimums; check its current encoder table for your intended format because platform guidance can change.
For bandwidth, add the bitrate of the primary and any backup stream, then compare the total with measured outbound capacity. YouTube recommends leaving 20% headroom beyond the total stream bitrate. Check the actual allocation and observed throughput for your Hetzner server, account, and region: no particular Hetzner instance’s bandwidth or performance can be inferred from the provider name alone. Network instability can interrupt delivery, but a bandwidth check alone does not establish the cause of a timestamp offset.
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Run a controlled test before returning to a public stream
- Use a short private or unlisted test where appropriate, with representative motion and audio and a clear sync event.
- Capture the FFmpeg output and compare the event near the start and again later. Check the Live Control Room preview and stream-health messages as well.
- Change one relevant timestamp, filter, or synchronization setting per run. Keep the command and logs for each run, and restore the known-good command if the change makes sync or audio quality worse.
- Before resuming a public broadcast, confirm that the chosen stream settings match your intended resolution, frame rate, codec, and available outbound bandwidth. Make sure the material you broadcast is cleared for use; technical sync does not resolve copyright or reused-content concerns.
Common symptoms and what to check next
- Audio is late by about the same amount throughout: measure the offset and identify the leading input; test an appropriately placed
-itsoffseton the affected input. - Audio starts in sync but gradually moves away: inspect sample and timestamp progression and determine whether independent sources share a clock. Test audio compensation only if the evidence supports it.
- Sync suddenly jumps: correlate the jump with FFmpeg logs, source interruptions, and timestamp discontinuities. Find which input changed before attempting a correction.
- Video motion looks uneven after a sync change: review the source frame rate and output synchronization mode. CFR may duplicate or drop frames; do not assume that changing it corrects audio timing.
- Local output is synchronized but the YouTube preview is not: inspect ingest and stream-health messages, and run a representative pre-test before changing FFmpeg timestamp handling.
- The stream health reports connection trouble: check measured outbound capacity against the combined primary and backup bitrate, retaining YouTube’s recommended headroom. This addresses delivery capacity, not necessarily sync.
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