By PURPLELEC | 05 December 2023 | 0 Comments
How to choose the best capture card for your needs
When choosing a capture card, you need to consider these four factors:
1. Internal/external capture card selection
An external capture card is enough for ordinary live broadcast rooms with goods. For some product promotions or large-scale event live broadcasts, this kind of more stable built-in capture card can be given priority. If you are doing a multi-camera live broadcast and want to save money on the broadcast station, you can consider a multi-channel built-in capture card that can switch between multiple cameras.
2. The difference between 2.0/3.0 capture cards
Is your capture card 2.0 or 3.0? Generally speaking, 2.0 capture cards transmit compressed images, and the image quality will be lost. The 3.0 capture card transmits uncompressed images, and the image quality will be much better.
3. Whether to select 4K for the capture card
Do we need a 4K capture card for 4K quality output? Currently, the highest resolution of some mainstream live broadcast platforms is 1920X1080 and cannot reach 4K, so when we do live broadcast, a 1080 capture card is enough. used.
4. Performance of delay, color cast and stability
You can't just look at the parameters of the merchant's trademark, but the actual use effect. When we buy a capture card, the manufacturer will tell you that the parameters are 4K 60 frames or 1080p 60 frames, but they will not tell you the color format. The clarity of the image quality and the width of the color gamut of different color formats are completely different. of. RGB>YUY2>NV12>MJPEG. When choosing a capture card, we must at least ensure the YUY2 format. If possible, it would be better to choose the RGB format.
5. Whether to support ring-ratio output?
The simplest capture card is an HDMI input interface and a USB signal output interface.
There is an obvious problem with this kind of capture card. Generally, there is only one HDMI interface on our Switch device. This interface is originally connected to the monitor, but when it is occupied by the capture card, your monitor cannot be used. In order to solve this problem, slightly better capture cards will also add an HDMI output interface.
After the video signal enters the capture card, it is copied into two copies. One copy is directly input to the display from the other HDMI without processing. This ensures that the picture is lossless and delay-free. This is called loop-out.
The other part is converted into a USB signal according to the process and input into the collection computer for encoding and compression. This is called recording. Since the loop is simply a copy of the image and does not require conversion processing, most capture cards on the market will support 4K resolution loop out, but what really makes the difference between capture cards is the recording process.
The function of the capture card is to convert the captured HDMI video signal into a USB signal, which we can call decoding. The most intuitive parameter difference is that most capture cards under a thousand yuan can only record 1080p 60-frame video, while some high-performance capture cards can record 4K 60-frame video, because the recording resolution is the most intuitive for the performance of the capture card. manifestation.
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