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Fix Guide

How to Fix Frozen Video on the Elgato Facecam 4K During Streaming or Recording

Device: Elgato Facecam 4K · Elgato Added

Causes

  • USB bandwidth saturation when the Facecam 4K shares a USB controller with other high-bandwidth devices (external SSDs, capture cards, multiple webcams) — the 4K60 uncompressed stream requires a sustained 3–4 Gbps of USB 3.0 bandwidth
  • PCIe 4.0 USB controller compatibility issue on certain motherboards — the USB controller on AMD X670E / B650 and some Intel Z790 boards can experience frame buffer stalls when the PCIe link is negotiated at Gen 4 speeds, freezing the video while audio continues
  • USB transfer mode mismatch — the Facecam 4K defaults to Bulk transfer mode, which can cause buffer underruns on USB controllers that handle Bulk interrupts poorly under concurrent I/O load
  • Insufficient power delivery from a bus-powered USB hub or the computer's USB port, causing the camera to drop frames and eventually freeze as the internal ISP (Image Signal Processor) loses its voltage rail momentarily
  • Outdated Facecam 4K firmware — early firmware revisions had a known memory leak in the ISP buffer management that causes the video feed to freeze after 20–40 minutes of continuous streaming

How to Fix

  1. Open Elgato Camera Hub, click the gear icon in the bottom-left, and go to the Device tab. Change USB Transfer Mode from Bulk to Isochronous (ISO). ISO mode uses guaranteed USB bandwidth and eliminates buffer underrun freezes. Click Save to Device and restart Camera Hub.
  2. Disconnect other high-bandwidth USB 3.0 devices while using the Facecam 4K — especially external SSDs, capture cards, and other webcams. USB controllers typically share a single 5 Gbps uplink; the Facecam 4K at 4K60 consumes most of that bandwidth alone. Temporarily move storage devices to a different USB controller (e.g., USB-C ports on the opposite side of the laptop, or a different USB controller bank on desktop motherboards).
  3. If you have an AMD AM5 or Intel 13th/14th-gen system, enter the BIOS (press Del or F2 during boot). Navigate to PCIe Configuration or Advanced → PCI Subsystem Settings. Find the PCIe Speed or PCIe Link Speed option for the slot your USB controller is connected to and set it to Gen 3 instead of Gen 4 or Auto. Save and reboot. This forces the USB controller onto PCIe 3.0, which resolves the known USB frame buffer stall issue on PCIe 4.0 controllers.
  4. Update the Facecam 4K firmware to the latest version. In Camera Hub, click the gear icon → Device → Firmware — if an update is available, click Update. Do not disconnect the camera during the update process (takes about 2 minutes). After updating, check the firmware version in the Device tab — the latest release at time of writing is 2.1.0 or newer, which fixes the ISP memory leak.
  5. Connect the Facecam 4K directly to your computer — do not use any unpowered USB hubs, KVM switches, or extension cables. If you must use a hub, use a powered (self-powered) USB 3.0 hub with its own AC adapter. The Facecam 4K draws up to 4.5W (0.9A at 5V), and unpowered hubs often cannot maintain stable power delivery.
  6. Reduce the video resolution or frame rate as a temporary workaround. In Camera Hub or your streaming software, switch from 4K 60fps to 4K 30fps or 1080p 60fps. The reduced bandwidth requirement often stabilizes the video feed on USB controllers that are marginal at 4K60. Once stable, you can incrementally increase settings to find the maximum sustainable configuration.
  7. On Windows, open a Command Prompt as Administrator and run powercfg /setacvalueindex scheme_current sub_pciexpress aspml1disabled 1 followed by powercfg /setactive scheme_current, then reboot. This disables PCIe ASPM L1 substates, which have been known to cause USB controller latency spikes that manifest as video freezing on systems with aggressive power-saving enabled.
  8. If the freeze only occurs in OBS Studio, go to OBS → Settings → Advanced → Video and set the Color Format to NV12 (not I420 or P010). NV12 requires less USB bandwidth and is better optimized for the Facecam 4K's ISP pipeline. Also disable Video Buffering in the Facecam 4K source properties within OBS.