#7 key parameters for selecting a video capture card (tested and verified version)
>Target keywords: How to choose a video capture card, capture card parameters, live streaming capture card recommendation
>Topic: 2 | Date: June 12, 2026 | Author: CC-4


I bought a 4K capture card for 800 yuan, but the live streaming quality is not as good as the screen mirroring of a mobile phone. "
This is Zhihu's roast, which has been praised by more than 2000 people. The comment section is filled with the phrase 'me too'. Our team then conducted a small experiment: we bought 5 different price range capture cards (99 yuan to 799 yuan) from an e-commerce platform, used the same camera, computer, and live streaming software, and broadcasted for 4 hours. As a result, it was found that the most expensive is not the best, but the cheapest is definitely the cheapest.
In this article, I will break down and explain these 7 parameters clearly, and each parameter will tell you a "self testing method" - no need for professional instruments, it can be verified at home.

##Parameter 1: Encoding format - the first threshold for image quality
Why is it the most important? The acquisition card converts HDMI signals into USB data streams, and the encoding format used in this conversion process directly determines the ceiling of the image. The difference between the MJPEG encoded image and the YUY2 encoded image, with a nominal 1080P frame rate of 60, is so large that it can be distinguished by the naked eye.
We tested the encoding format and subjective image quality comparison of 5 capture cards at 1080P 60 frames per second
|Capture Card | Highest Encoding Format | Color Blocks | Text Clarity | Motion Picture|
|--------|------------|------|-----------|---------|
|99 yuan public model card | MJPEG | Large area color block, red gray hair | Blurred small text | Severe ghosting|
|199 yuan Cool Hi Mi 2131 | YUY2 | Natural transition | Clear and readable | Slight ghosting|
|399 yuan Green Union | YUY2 | Natural transition | Clear | Basic smoothness|
|698 yuan Cool Hi Mi 26P | RGB24 | Close to original painting | Sharp | Smooth|
|799 yuan round rigid GC553 | RGB24 | original level | sharp | smooth|
Test method: Open a PPT with a pure red background and white 12px font, output it to the capture card through the camera HDMI, take a screenshot, and use a straw tool to observe the RGB value deviation in the red area. The red color captured by MJPEG card deviates by 12 color levels, and the face looks like powder blusher.
*How to test it yourself: * Open a solid color webpage (take a picture of red, green, and blue each), take a screenshot and zoom in to see if there are any color blocks. When the MJPEG image is enlarged to 200%, obvious mosaic blocks can be seen, while YUY2 and RGB24 have smooth transitions.
Conclusion: Choose YUY2 at least. If you only indicate 'support 4K' but do not write the encoding format, it is most likely MJPEG. Be cautious when buying.

##Parameter 2: Delay - the lifeline of game live streaming
Delay is the parameter of the acquisition card that is most easily "falsely labeled". Many product detail pages claim "ultra-low latency", but in reality, the sound and image are not synchronized, and the mouth shape and sound do not match.
Our testing method: Using the "Video Delay Test" function of OBS - the screen displays a millisecond level timer simultaneously, one connected directly to the monitor through HDMI and the other through the acquisition card into OBS. The phone captures two screens simultaneously and calculates the time difference.
|Acquisition card | nominal delay | measured delay|
|--------|---------|---------|
|99 yuan USB 2.0 male model | unmarked | 180ms+|
|199 yuan Cool Hi Mi 2131 |<50ms | 48ms|
|399 yuan Green Union | unmarked | 52ms|
|698 yuan Cool Hi Mi 26P | 43ms | 43ms|
|799 yuan round rigid GC553 | unmarked | 38ms|
The latency of USB 2.0 capture cards is generally above 100ms - when playing FPS games, by the time you see an enemy, they have already fired two shots. The delay of game live streaming must be less than 50ms (barely perceptible to the human eye), and live streaming for sales within 80ms is also acceptable.
*How to test on your own: * No need for professional equipment. Open an online stopwatch webpage on the computer, aim the camera at the screen, output HDMI to the capture card and enter it into the OBS. The phone simultaneously captures the computer screen and the OBS preview image, and compares the stopwatch numbers in the two images.
Conclusion: Game live streaming must choose a USB 3.0 or higher interface. The latency of USB 2.0 acquisition cards is not less than 100ms, which is determined by physical bandwidth and cannot be solved by optimization.

##Parameter 3: Loop out function - not optional as you imagine
The meaning of HDMI OUT/Pass through is that the video signal is divided into two paths after entering the acquisition card, one path is output to the monitor as it is (with zero delay), and the other path is collected by the computer. Without a looped acquisition card, you can only view the OBS screen on the computer, which already has a delay of several tens of milliseconds.
This is fatal in game live streaming. Switch connected to acquisition card → no loop out → can only watch OBS screen and play games → 48ms delay → extremely poor experience for levels that require precise operation.
There is an out of loop collection card that allows you to simultaneously:
-Monitor ring output port → Zero latency gaming
-Computer connected to USB for data collection → OBS streaming
*How to test on your own: * Connect the ring out display and play a high-speed motion video (such as a racing game). Compare the ring out display with the OBS preview screen. The ring out is almost synchronized, but the OBS screen lags significantly.
Conclusion: Game live streaming must have a loop. Pure sales/teaching live streaming can avoid worrying about this feature.

##Parameter 4: "True/False 4K60" of resolution and frame rate
This is the most chaotic part of the card market. Many product detail pages have large characters that read '4K60 frames' and small characters that say' Loop out 4K60, capture 1080P30 '. Without carefully reading the parameter table, it is impossible to detect.
Our verification method: Connect a camera capable of outputting 4K60 frames to a capture card and check the actual selectable capture resolution in OBS.
|Nominal | actual collection | price | pit index|
|------|---------|------|-------|
|4K60 Capture Card | 1080P30 MJPEG | 99 yuan| ⭐⭐⭐⭐⭐ |
|4K60 Loop Out Acquisition Card | 1080P60 YUY2 | 199 yuan| ⭐⭐⭐ |
|4K60 Acquisition Card | 4K30 YUY2 | 399 yuan| ⭐⭐ |
|4K60 Acquisition Card | 4K60 RGB24 | 698 yuan+| None|
*At present, the domestic mainstream live broadcast platform (Tiktok/Kwai/B station) only supports 1080P streaming * at most, and blind pursuit of 4K acquisition has no practical significance. More money should be spent on encoding formats and low latency.
*How to test on your own: * Connect the capture card, open OBS ->Video capture device properties ->Resolution/FPS type set to "Custom" ->Check the drop-down list to see which resolutions and frame rates are actually available. If the maximum in the customization is only 1080P, it means that the 1080P card has a 4K ring hanging out.
Conclusion: For 1080P live streaming requirements, choosing a card that supports 1080P 60 YUY2 capture is sufficient, with a budget of 300-500 yuan providing a good option. Unless there is a need for 4K recording, do not spend too much money on the word '4K'.

##Parameter 5: Heat dissipation - the true test of 4-hour live streaming
This is an untested but extremely important parameter. The live broadcast lasts for 3-4 hours, and the poorly cooled capture card starts to drop frames, increase latency, or even disconnect after about 1 hour.
We conducted a 4-hour continuous streaming test (at room temperature of 28 ℃, 1080P 60 frames per second, encoding YUY2):
|Acquisition card | Shell material | 1h temperature | 4h temperature | 4h frame rate stability|
|--------|---------|--------|--------|------------|
|99 yuan public mold | Plastic | 62 ℃ | 71 ℃ | Frame drop starts at the 3rd hour|
|199 yuan Cool Hi Mi | Aluminum Alloy | 45 ℃ | 52 ℃ | Stable throughout the entire process|
|399 yuan Green Union | Aluminum alloy | 43 ℃ | 51 ℃ | Stable throughout the entire process|
|698 yuan Cool Hi Mi 26P | Aluminum alloy+heat dissipation hole | 38 ℃ | 44 ℃ | Stable throughout the process|
What is the concept of 71 ℃? You have to retract your hand within 3 seconds. When the 99 yuan plastic shell acquisition card reached the fourth hour, the frame rate displayed in the OBS fluctuated from a stable 60fps to 47-52fps.
*How to test on your own: * After the collection card is pushed for 1 hour, touch the outer shell with your hand (be careful of scalding). Warmth is normal, but if it's hot, it means there's no heat dissipation. A better approach is to go to OBS ->Statistics ->Check for any frame loss or encoding delay warnings after 1 hour of live streaming.
Conclusion: Choose products with aluminum alloy shell and large area heat dissipation holes. Don't believe that 'fever is normal' - fever is normal, but burning is not.

##Parameter 6: Compatibility - a dark pit for Mac and Linux users
Many collection card detail pages only state "compatible with Windows", but Mac users find that they either do not recognize it or the screen freezes when they buy it. We tested the support of 5 collection cards for macOS:
- Drive free plug and play (recognized directly by Mac): Cool HiMi 26P, Yuangang GC553, Green Link
- Third party software needs to be installed to use: Akasis partial models (requires OBS Link)
-Mac does not recognize: 99 yuan public model card, some miscellaneous cards
Another overlooked point is the USB interface version. Many MacBooks only have USB-C ports and require an adapter cable. If the adapter itself is USB 2.0 speed, no matter how strong the acquisition card is, it is useless - the data bottleneck lies in the adapter.
*How to test it yourself: * If you have a Mac, simply plug it in and check the system report → USB device → see why the acquisition card is recognized by the device. If it displays as "USB 2.0 Hub" instead of "USB 3.0/3.1 Hub", it indicates a 2.0 bottleneck in the link.
Conclusion: Confirm that the product page clearly states Mac compatibility before purchasing. Laptop users with USB-C ports should pay attention to the USB version of the adapter/docking station.

##Parameter 7: Brand and after-sales service - the collection card is not a fast-moving consumer product
The card market is mixed with good and bad players. Search Taobao for "collection card". There are dozens of brands of "4K collection card" with the price below 99 yuan, and the appearance is identical (male model is labeled), but the store was closed less than half a year after opening.
There is a simple criterion for brand selection: Check if the company has an official website and if the website has continuously updated firmware downloads. **
- Official website+firmware updates available: Yuangang (Taiwan veteran, frequent firmware updates), Kuhaimi (domestic brand, fast technical support response), Meilewei (broadcast grade, complete technical documentation)
- Official website with no updates: Some Green Alliance series, Akasis (firmware factory final version)
- No official website: All public model OEM products (can only be disposed of if damaged, no after-sales service)
The core chips of the acquisition card (such as MS2130, MS2131, IT6801) mostly come from the same chip factory, but firmware tuning, heat dissipation design, and quality control are determined by the brand. On the same chip, there is a significant difference in image quality between good firmware and poor firmware - which is why high-end brands are three times more expensive than miscellaneous brands with the same chip, but the image quality is indeed better.
*How to test it yourself: * Search for brand name+space+firmware to see if there is a firmware download page. If you can't find the official website, after-sales service basically relies on luck.
Conclusion: It is better to spend an extra 200 yuan on a brand with sustainable operation capabilities than to deal with a 50 yuan public model OEM product.

##Summary: Take your seat according to your needs
|Scenario | Recommended Price | Key Parameters | Recommended Direction|
|------|---------|---------|---------|
|Switch screen mirroring video recording | 100-200 yuan | YUY2 encoding, USB 3.0 | Cool Hi Mi 2131, Green Giant Energy|
|Live streaming sales/teaching | 400-600 yuan | YUY2/RG24 encoding, good heat dissipation | Green Link 4K, Cool Hi Mi 26P|
|Game live streaming (console) | 600-800 yuan | RGB24, low latency, with loop out | Cool Hi Mi 26P, Yuangang GC553|
|Professional multi machine live streaming | 1000 yuan+| PCIe interface, uncompressed | Meilewei, built-in capture card|
|Mac users | 400 yuan+| Clearly indicate Mac compatibility | Cool Hi Mi 26P, Round Gang series|
The core logic of selecting a capture card is in one sentence: Within the budget, prioritize spending money on encoding formats and latency, rather than the two words' 4K '. **YUY2 encoding+USB 3.0+aluminum alloy heat dissipation card, you can buy a very useful one within 500 yuan. Every penny that goes up is spent on brand premium and hard spec upgrades like RGB24/4K60- whether it's worth it or not depends on your actual needs.

To learn more about video capture schemes, please visit the official website videowell.work, or follow the WeChat official account to get the latest product evaluation