What is a video encoder
A video encoder is a tool that can compress and convert digital video signals into a specific format. It uses specific algorithms to reduce the size of video files for easy storage and transmission, while improving the efficiency of video encoding and decoding, reducing bandwidth requirements, and ensuring video quality. Video encoders are widely used in video sharing platforms and online live broadcast platforms. By compressing video data and changing the storage method of video data, the size of video files can be reduced while maintaining high quality. In addition, video encoders can also change the video format so that videos of different formats can be played on different devices and platforms, as well as adjust the image quality.
A video capture card is a hardware that can capture audio and video signals at the same time. It can capture video signals into a computer and save them on the hard disk in the form of data files. Video capture cards are essential hardware devices for video processing. Through them, we can transfer the video signals shot by the camera from the camera tape to the computer, and use relevant video editing software to post-edit the digitized video signals, such as cutting pictures, adding filters, subtitles and sound effects, etc.
The difference between video encoder and video capture card
1. Working principle
Video encoder: mainly responsible for compressing and transcoding video signals, converting raw video data into smaller files for easy storage and transmission. It usually needs to compress, transmit and decode the raw image data, which may cause a certain picture delay.
Video capture card: mainly responsible for collecting video signals from external devices (such as cameras, cameras, etc.) to the computer and saving them in the form of data files. It can directly obtain real-time raw images without going through the compression and decoding process.
2. Application scenarios
Video encoder: more suitable for scenarios that require video compression, transcoding and transmission, such as live broadcasting, video sharing platforms, etc.
Video capture card: more suitable for video signal acquisition and preliminary processing, such as video editing, surveillance recording, etc.
3. Interface and independence
Video encoder: supports input of multiple interfaces, can work independently without relying on other devices.
Video capture card: signal input is generally BNC connection, which requires the cooperation of the computer host to work.
4. Price
Generally speaking, the price of video encoders is slightly higher than that of video capture cards, which is related to their more advanced functions and independence.
Conclusion
Video encoders and video capture cards each have their own unique roles and application scenarios in the field of video processing. Video encoders are mainly used for video compression, transcoding and transmission, while video capture cards are mainly used for video signal acquisition and preliminary processing. Users can choose the appropriate device according to their needs and scenarios.
