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When I record video captured from USB Capture (Plus) devices with OBS, the audio and video are out of sync

Check the usage of GPU and CPU when recording video with OBS. If the values are too high, reduce the encoding parameters. Record a video clip with Capture Express to see if the synchronization issue occurs. In OBS, do not select audio devices in the properties window of video capture device. It is recommended to add an independent audio input device and select the Use Device Timestamps checkbox.

Short FAQs about USB Capture (Plus)

What is the latency of USB Capture (Plus) device? Please refer to this article: USB Capture Latency Test. Which software can record 4K videos that are captured by USB Capture HDMI 4K Plus? Magewell Capture Express, VMix, OBS, XSplit Broadcaster, Meridix Broadcast Producer, etc., support 4K video recording. Can't capture audio when USB Capture HDMI Gen2 is used via the USB 3.0 expansion card of a VIA chip It is recommended to update the VIA chip driver to version 4.90A or above. My computer does not have a USB 3.0 port. How can I use the USB Capture (Plus) device? It is recommended that you purchase a USB type C to USB 3.0 adapter. Is USB Capture (Plus) compatible with USB 2.0? Yes. But the limited transmission bandwidth of USB 2.0 cannot guarantee the transmission of high frame rate or high resolution signal. Can multiple USB Capture (Plus) devices be connected on one computer? Yes. To ensure that the bandwidth won't be affected, make sure each USB capture device can be connected to an independent USB 3.0 Extensible Host Controller. You can check whether your computer has multiple independent USB 3.0 Extensible Host Controllers in Device Management. Do USB Capture (Plus) devices support using a phone or tablet as a source? Yes. Apple devices can use Lightning to HDMI cables to output screen signals. Android devices can use MHL adapters to output screen signals. When the computer connects with multiple USB Capture (Plus) devices, how are the devices sorted in the system? Devices are sorted by the time they are loaded by the system. Does the 3.5mm Jack interface on USB Capture HDMI (4K) Plus support Line Input? This interface can only be used to capture microphone audio. The level of the Line In audio is at least 50dB above that of the microphone audio. Misuse may cause damage to the hardware components of your capture device. What is the maximum frame rate when capturing 4K video using USB Capture HDMI 4K Plus? USB Capture HDMI 4K Plus supports 4Kp60 video input. However, limited by the bandwidth of USB 3.0, the maximum frame rate can only reach 30 fps when capturing 4K video in NV12 color format. What's the meaning of different statuses of indicator light? Please refer to this article: Status of the Indicator Light on USB Capture (Plus) device. Which brand of chipset is compatible with USB Capture (Plus) devices? USB Capture (Plus) devices are compatible with chipsets from Intel, Renesas, ASMedia and Fresco Logic. Only one audio channel can be found when I use a capture device that supports multiple audio channels on the macOS 10.13.1 system Please upgrade your system to macOS 10.13.2 and above. The captured 4K NV12/I420 video has ghosting problem Please update your firmware to the latest version. Will the capture quality and product life of device be affected by high working temperature? The housing temperature of Magewell USB capture device may be higher because of its metal shell and special cooling design. As long as the operating ambient temperature is between 0 to 50 ℃, it won't affect the capture quality and product life.

Do Magewell HDMI capture devices support CEC, HDR, or Camera Link?

Not support CEC. Pro Capture HDMI 4K Plus, Pro Capture HDMI 4K Plus LT, Pro Capture Dual HDMI 4K Plus LT and Pro Capture AIO 4K Plus support HDR. (only HDR10 standard). Not support Camera Link.

How to deal with audios captured by USB Capture (Plus) devices are all noises

If you are experiencing audio issues while using USB Capture Device, follow the steps below. Check whether the USB Capture Device is connected to a USB 3.1 port on your PC. If yes, please check with your PC brand manufacturer or PC motherboard manufacturer for the latest USB 3.1 updates. If no, or the audio issue remains after the update, please contact us for further information.

How to adjust volume when using USB Capture and USB Capture Plus for capturing

The volume adjustment procedure for USB Capture and USB Capture Plus family is basically the same, and the interface may change according to different product and version. 1Set the default playback device In the System Settings dialog box, click Sound to open the Sound dialog box. In the Output tab page of the Sound dialog box, select Headphones. 2Adjust volume in USB Capture Utility V3 Adjust the volume of each PLAYBACK audio in the Volume tab page Adjust the volume of each RECORD audio in the Volume tab page

How to use USB Capture HDMI Gen 2 and USB Capture HDMI Plus in Zoom Rooms

Magewell USB Capture HDMI Gen 2 and USB Capture HDMI Plus external capture devices have been certified for use with Zoom Rooms. To use either of these products in conjunction with Zoom Rooms, please follow the below steps:  Connect your video source to a USB Capture HDMI Gen 2 or USB Capture HDMI Plus device, and connect the Magewell device to the Zoom Rooms computer via USB. Zoom Rooms will recognize the Magewell unit as a Content Sharing device and will begin sharing video and audio content. Magewell USB Capture devices support plug and play. Once you connect the device to the computer, you can use it without installing any drive. When you open the Zoom Room Controller, you can find the Magewell unit in the camera device list. If you cannot find it, please refer to Can't find Magewell capture device in Zoom Rooms.

Can't find Magewell capture device in Zoom Rooms

Windows In the Windows OS, right click , and select Device Manager. Then you can check whether the Magewell unit is in the Camera list. Not found: Check whether you have used the cable provided by Magewell, or you can connect to another USB port. Found: Check the privacy settings. Please refer to  the 3rd section in Can't use or find Magewell capture device on Windows. macOS  In the macOS,  click Apple icon > About This Mac > System Report.  Then you can check whether the Magewell unit is in the Camera  list. Not found: 1. Check whether you have used the cable provided by Magewell. 2. Connect to another USB port. 3. If you have changed the color space with  USB Capture Utility V3, refer to Video capture software can't find video capture device after changing the color format in USB Capture Utility V3 (Mac). Found: Check the privacy settings. Please refer to the 3rd section in Can't use or find Magewell capture device on MacOS.

How to reduce the latency of USB Capture HDMI 4K Plus

If you are experiencing frame drops and lag with the USB Capture HDMI 4K Plus, please follow these steps to troubleshoot: Check the capture software settingsEnsure that the recommended setting in the capture software is 1920x1080p 60fps RGB24/YUY2. If the settings exceed this recommendation, frame dropping may occur. For example, if the capture software is set to 4K 60, the USB 3.0 bandwidth limitation may prevent the capture from reaching the set frame rate, resulting in frame dropping and stuttering.  You may check the output format on USB Capture Utility. Connect USB 3.0 port with the USB 3.0 cableConnect the USB Capture HDMI 4K Plus using the original USB 3.0 cable. Make sure to connect it to the USB 3.0 port on your computer, which is usually colored blue, blue-green, or red. Avoid connecting to black ports, as they are typically USB 2.0 ports. For desktop computers, it is recommended to connect to the USB 3.0 ports on the rear panel, as front panel ports with long wires may lead to insufficient power supply. Check the USB port speedUse USB Capture Utility to verify the actual speed of the current USB port. Ensure that it is operating at USB 3.0 speed. If it is running at USB 2.0 speed, switch to a USB 3.0 port or reconnect the cable. Check whether there are other devices occupying USB bandwidth  Disconnect any other USB devices that may be causing the drop in speed. If the above methods do not solve your problem, please email to sales@magewell.com.

How to enable/disable the audio output of USB Capture (Plus) series

USB Capture (Plus) series （Firmware version V2.6.10385 and above）support Audio Control, enabling customized selection of recording and playback devices. Steps: Open the USB Capture Utility  (V3.0.5.42875 and above). Go to "Advanced" > "Audio Control" tab. Select one device in the list to use its audio; Unselect one device, to close its audio. (All are selected by default.) After modification, click "Save to Device" at the bottom right of the window, confirm the change in the pop-up window. And the modification will take effect after disconnecting and reconnecting the device.   On Windows devices, this change is synchronised to refresh the USB Capture (Plus) counterpart display in the 'Device Manager > Audio inputs and outputs' section. Example: Select all the recording and playback devices for USB Capture HDMI Plus to enable their audio. The audio items are displayed in the Windows Device Manager. 2.  Unselect all the recording and playback devices for USB Capture HDMI Plus to disable their audio. The audio items disappear in the Windows Device Manager.

Capturing RGB Format Video with Magewell USB Capture Dongles

In addition to capturing common video formats such as YUY2 and NV12, Magewell USB Capture dongles support capturing video in RGB formats. By comparison to other formats, RGB24 and RGB32 can better preserve color fidelity, particularly from signal sources such as computers that are natively RGB. Follow the steps below to use Magewell USB Capture dongles to capture RGB format video. From the Support > Downloads section of the Magewell website, select USB Capture, click the Tools tab and download the USB Capture Utility software (hereafter referred to as the "Utility") for your particular operating system (Windows/Linux/Mac). Install the Utility software on your computer, and connect your USB Capture dongle to the computer via a USB cable. Run the Utility software, then click Advanced. Select the Color Format tab. The left column will show the color spaces currently supported by the dongle (YUY2 in the example below). Click to select RGB24 on the right, then click "<" to move it to the list on the left. The dongle can now support capturing in the RGB24 video format. Similarly, move RGB32 to the left list as shown in the subsequent Once you are done, click Save to Device. Now restart the dongle by unplugging then reconnecting the USB cable connecting the dongle to the computer. Software that supports the RGB color space can now capture it through your dongle. For example, in the OBS software, you can select RGB as the video format for capture.