By PURPLELEC | 12 June 2024 | 0 Comments
What factors affect high-definition video acquisition and compression?
If high-definition video is not compressed, the video file will be very large and not conducive to storage. Especially in live video, online conference, video monitoring, and distance learning, it is necessary to first use a video capture card to collect the signal of the video source device into the computer, and then compress and encode it through software, and finally become a video file that can be transmitted. Therefore, it is very important to understand the way of video compression and the factors related to the video compression size.
Why do we need to compress the video?
The purpose of video compression is to reduce the video data rate while ensuring the visual effect as much as possible, so that it is conducive to network transmission and storage. Otherwise, the video file will be very large without compression, which is not conducive to storage or transmission. There is a term: video compression ratio, which generally refers to the ratio of the amount of data after compression to the amount of data before compression. Since video is a continuous static image, its compression encoding algorithm has some similarities with the compression encoding algorithm of static images, but the moving video has its own characteristics, so when compressing, its motion characteristics should also be considered to achieve the goal of high compression.
High-definition video compression is related to the following factors:
First, the format: AVI is the largest, which is nearly 10 times that of WMV, 15 times that of MPEG, and so on. The smallest is FLV format. The basic order is AVI, WMV, MPEG-2, VOB, MP4, MOV, MPEG, RMVB, RM, FLV
The second is the video resolution: the larger the resolution, the larger the file.
The third is the video bit rate, the higher the bit rate, the larger the file.
Then you will understand how to compress an 8G video into about 3G----just set the above three parameters.
If it is compressed to such a small size, the quality of the video will be greatly reduced! This is inevitable, because the quality of the video is proportional to the size of the video file.
Of course, clarity and resolution are not proportional. Movies with high resolution may not necessarily have useful data for display; avi format may not be very clear, and mp4 format may not be unclear. If you want to watch a clear movie, first, you need to find a video with clear original image and low compression rate (some videos are large but not clear, often because the original video processed by them is not clear enough), and second, you need to have better display hardware equipment.
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