Do these 3 things before closing this tab:
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driver behind crashes, sound loss and screen glitches2Repair Windows errors before they cause bigger problems3Scan for outdated or missing drivers - takes under a minuteFirst determine whether the audio is out of sync by roughly the same amount throughout the stream or whether the mismatch grows over time. A steady offset usually points to different start times; increasing drift calls for investigating timestamps and clock rates. Those cases need different fixes, so measure before changing FFmpeg options.
Measure the mismatch before changing FFmpeg
Compare audio and video near the beginning, then at one or more later points. Note whether the audio is early or late and estimate the offset each time. Use a private or test stream when practical, and keep the source and command unchanged while measuring.
- About the same offset at each point: investigate an initial offset or different input start times.
- The offset grows or shrinks: investigate clock or timestamp drift, including source timestamps that do not track real time.
- The mismatch changes abruptly: look for missing, irregular, or discontinuous timestamps, and note when the change occurs.
This classification is a troubleshooting guide, not proof of a particular cause. A stream made from one media file, two capture devices, or independent real-time inputs can have different timing behavior.
Collect the FFmpeg details that determine the fix
- Record the FFmpeg version and build, the full command, and relevant log output. Remove or redact the YouTube stream key before sharing logs or command lines.
- Use local FFmpeg tools to inspect the audio and video stream start times, time bases, audio sample rate, video frame rate, and any timestamp warnings.
- Identify how the inputs are produced. Determine whether audio and video come from the same file or device, or from separate real-time sources.
- If inputs are separate, find out whether their timestamps come from a shared clock. This matters if you plan to use
-isync.
The online FFmpeg documentation is regenerated nightly and describes the newest revision, not necessarily the version installed on your system. Check documentation for your installed build before relying on an option’s availability or behavior: FFmpeg command-line documentation.
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Fix a steady audio offset
When the mismatch is approximately constant from the start through later checks, test an input timestamp offset rather than changing frame rate or applying audio compensation intended for accumulating drift.
Use -itsoffset to adjust an input’s start timing
FFmpeg’s -itsoffset adds an offset to timestamps for an input. A positive value delays that input. Apply it to the input that needs to move, using a measured amount, then check sync near the beginning and later in the stream. Option placement matters: consult the installed FFmpeg command-line documentation for input option placement and syntax. Do not assume which stream to delay without first measuring whether audio leads or lags video.
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Use -isync only when its clock assumptions fit
-isync offsets a target input by the start-time difference from a reference input. FFmpeg says the inputs should derive their timestamps from the same clock source for the expected result. It is a possible way to align start times, not a general correction for drift that accumulates as a stream runs. See the FFmpeg command-line documentation.
Investigate drift that accumulates over time
If the audio/video gap changes as the stream continues, inspect whether source timestamps remain valid and whether independent inputs follow the same clock. FFmpeg’s audio resampler can use timestamps to stretch, squeeze, fill, or trim audio samples to compensate for timing differences.
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Test timestamp-based resampling carefully
The resampler’s async option is disabled by default. Setting async=1 enables filling and trimming; larger values set the maximum sample compensation per second. The resampler also documents first_pts for padding or trimming at the stream start and min_comp as a threshold for compensation. These controls affect timing behavior, and the appropriate values depend on the input. Inspect the source timing, consult the FFmpeg resampler documentation for your installed version, and test before using the change in a live stream.
Do not choose an async value just because drift is present. If timestamps are missing, irregular, or discontinuous, first establish what the source is sending; compensation cannot be selected responsibly from the title or symptoms alone.
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Check video timing without treating frame-rate changes as a cure
Video timing can contribute to the diagnosis, but arbitrary frame-rate changes are not a generic audio-drift fix. FFmpeg’s -fps_mode passthrough forwards frame timestamps. Its cfr mode duplicates or drops frames to reach a requested constant rate, and muxers can further modify timestamps. Changing frame handling may therefore change video timing rather than correct the underlying audio clock mismatch.
Use -fps_mode only when the source and desired output timing justify it. Avoid changing unrelated timing options at the same time, and verify sync again at multiple points. The option behaviors are described in the FFmpeg command-line documentation.
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Changes that usually do not solve relative drift
- Shifting all output timestamps uniformly: this preserves relative audio/video timing differences, so it does not by itself repair an existing mismatch. See the FFmpeg formats documentation.
- Increasing an output queue or buffer as a drift fix: interleaving and buffering concern packet output behavior; they are not established here as general corrections for accumulating audio/video drift.
- Changing several timing flags at once: this makes it difficult to tell which change helped or introduced a new timing problem.
- Applying a constant offset to growing drift: an offset can align one point while leaving the mismatch at other points unresolved.
Verify the change in a controlled stream
- Save the original command and logs, with the stream key removed from any copy you retain or share.
- Change one timing-related setting that matches the diagnosed case: an input offset for a steady difference, or a carefully tested timestamp-compensation approach for accumulating mismatch.
- Run a private or test stream and compare sync at the start and at later points. Confirm that the chosen change improves the whole interval rather than only its opening.
- If the result worsens or changes unpredictably, revert the last change and investigate the timestamps, input clocks, and warnings before trying another setting.
Troubleshooting by symptom
| What you observe | Likely area to investigate | Next step |
|---|---|---|
| Audio is early or late by about the same amount throughout | Different input start times or an initial offset | Measure the offset and test an appropriate -itsoffset; consider -isync only if the inputs share a clock source. |
| The mismatch steadily grows or shrinks | Clock-rate or timestamp drift | Check source timestamp quality and clocks; test timestamp-based audio resampler compensation with values appropriate to the input. |
| Sync changes suddenly at a particular point | Irregular, missing, or discontinuous timestamps, or a source change | Inspect logs and timestamps around that point before changing compensation settings. |
| A timing change fixes the opening but not later playback | A fixed offset is being used against a changing mismatch | Reclassify the problem using multiple measurement points and examine clock and timestamp behavior. |
Changing -fps_mode makes playback worse |
Video frames are being passed through or altered in a way that does not suit the source timing | Restore the prior mode and choose video timing based on source and output requirements, not as a default audio fix. |
| Changing a global timestamp shift has no effect on relative sync | The shift applies equally to audio and video | Adjust or correct the specific input timing or source timestamps instead. |
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