First check whether the audio-video gap is already present at the start of the Wirecast broadcast or grows as the stream runs. A steady gap is a fixed offset; a widening gap points toward timing or source stability and is not fixed by repeatedly adding an arbitrary delay. There is no single documented cause for every long-broadcast sync problem. Work through the source chain, timestamps, system load, dropped frames, and relevant Wirecast version history before changing settings.
Measure whether the sync error is fixed or accumulating
Use a repeatable visual and audible event—such as a clap or a sharp cut with matching sound—and note the offset at the start and at regular intervals during a controlled test. Check the program output, not only local confidence monitoring.
- Roughly the same gap throughout: treat it as a fixed offset and measure how many milliseconds the audio leads or trails the picture.
- The gap grows over time: treat it as accumulating drift. Investigate source timing, source combinations, and system stability rather than assuming a static delay will solve it.
- Only viewers report the issue: compare a local program recording with the YouTube playback in a controlled viewing setup. This helps establish whether the mismatch exists before delivery or appears in the viewing path; it does not by itself identify YouTube as the cause.
The available Telestream material does not establish YouTube as a universal cause of sync drift during long broadcasts.
Trace the audio and video source chain
Write down where each signal enters Wirecast: camera audio, a separate microphone, a USB device, a capture card, or a Webstream source. Note whether audio and video come from the same device or clock, and whether the problem occurs with one input or only when multiple inputs are active.
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This is an isolation step, not a presumption that a particular device is faulty. Telestream’s release history includes historical sync-related fixes for Webstream sources, USB devices, and multiple inputs. Those entries are useful clues for deciding what to test, but they do not prove that a current installation has the same bug.
Test Webstream timestamp settings
For a Webstream source, open its source properties and compare the timestamp options labeled Provided by source and Provided by Wirecast. Change one setting at a time, then run a controlled test with the same source and monitor sync over time.
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Telestream’s Windows user guide says that some sources do not provide completely accurate timestamps, which can leave audio and video out of sync. It also cautions that Wirecast-generated timestamps can arrive late under heavy system load. Neither option is best for every source: use the setting that behaves correctly with the actual source and workload. See the Wirecast User Guide, Web Stream Properties, p. 135.
Correct a measured fixed offset in Wirecast
When the gap is consistent, use the delay control for the relevant source rather than guessing at a global correction. Telestream’s Windows guide describes audio and video delay controls adjustable in increments as small as 1 ms.
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- Measure whether the audio leads or trails the matching picture, and estimate the offset in milliseconds.
- Open the relevant source’s properties and locate its audio delay or video delay control.
- Adjust in small increments in the direction that reduces the measured mismatch. If a control affects the opposite signal from the one you intend, return it to its original value and adjust the other signal’s control.
- Check the program output again with the same repeatable event, then confirm the result at the beginning and later in the test.
A delay control can align signals with a fixed offset. It does not, by itself, correct a gap that keeps growing because timestamps or source timing are unstable.
Check sustained load, dropped frames, and delivery capacity
Watch Wirecast’s CPU and dropped-frame indicators during the broadcast, including after the stream has been running for a while. Telestream says sustained system CPU usage greater than 60% increases the likelihood of dropped frames. That figure is a performance-risk threshold, not proof that CPU load caused a sync problem.
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Also check whether upload capacity is sufficient for the configured stream and whether the symptom changes when viewing in a controlled local environment. Telestream’s FAQ recommends lowering the data rate—and, if needed, frame rate or frame size—when capacity is exceeded. Make one change at a time and compare results, since reducing output settings is a trade-off rather than a guaranteed sync fix. See Telestream’s Wirecast FAQ and Wirecast technical specifications.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Compare your installed version with Telestream’s history
Check the Wirecast version installed on the streaming computer, then review the official Wirecast version history for entries relevant to your inputs. Telestream recorded:
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- A Webstream-source audio/video sync issue fix in Wirecast 15.0.3, released June 27, 2022.
- Changes intended to improve sync drift between USB devices in Wirecast 14.3.2, released October 4, 2021.
- A fix for reported sync issues with multiple inputs in an earlier release.
These are historical examples, not a diagnosis of your current stream. Check whether your installed version and source path match the issue described before drawing conclusions.
Troubleshoot in a controlled order
- Establish the symptom: record the gap at the beginning and at fixed intervals; classify it as fixed or growing.
- Compare program output and delivery: determine whether a local program recording is already out of sync before YouTube receives it.
- Isolate inputs: test one source path at a time where practical, especially if the stream combines USB devices, Webstreams, or multiple inputs.
- Test Webstream timestamps: compare source-provided and Wirecast-generated timestamps without changing other conditions.
- Apply delay only for a measured fixed offset: adjust the relevant source control in small increments and verify later in the test.
- Observe performance: note CPU load, dropped frames, upload capacity, and whether a controlled local viewing setup changes the result.
- Check version history and preserve evidence: record the OS, Wirecast version, source configuration, timing observations, and relevant logs before contacting support. Telestream’s FAQ recommends submitting support information for software diagnosis, but does not specify a sync-specific log recipe.
Or let it run in the cloud
If your goal is to keep pre-recorded material live on YouTube around the clock, StreamNeo is a separate cloud workflow, not a Wirecast sync repair. Upload a recording or build a playlist, add your YouTube stream key once, and go live; StreamNeo loops the uploaded video from the cloud, so your computer and home connection do not have to stay on. It streams uploaded videos to YouTube, not live camera footage.
Each slot streams the uploaded file as made, up to 4K 60fps, at one flat price per slot; there are no quality tiers or re-encoding. It includes 24/7 looping and playlists, 10 GB of storage per slot pooled across active slots, automatic recovery if YouTube drops the stream, and StreamNeo team support. The first day is free with no card (one free day per account). Billing options are:
- Daily: $0.99 per day
- Weekly: $2.99 per week
- Monthly: $9.99 per month
- 6 months: $49.99 for 6 months
- Yearly: $89.99 a year
Plans include the same product; only billing length changes. You can cancel any time. UPI and cards are available in India, with card checkout worldwide; contact support for five or more slots. StreamNeo does not diagnose or fix sync drift in a live Wirecast camera production. Learn more at StreamNeo, or start the free first day.
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For a useful support report, include the Wirecast version and operating system; the make and model or type of each audio and video source; how each connects; whether the signals share a clock; the Webstream timestamp setting if applicable; whether the mismatch is fixed or accumulates; CPU and dropped-frame observations; and whether a local program recording is already out of sync. Add timestamped observations and a short representative recording if available. These details narrow the problem without assuming a single cause.
Quick Recap
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