What is a frame rate?
The rate of frames is the amount of frames that processes a video at a certain period of time (usually 1 second) and is related to the image quality of the video.
This article describes the speed of frames.
Table of Contents
1 speed of frames, video and frames
2 Frame and web conference speed
3 Video coding and bit rate
4 Video of the next web conference
Frame speed, video and frames
Have you ever wrote an animated book on the edge of a notebook when you were a child?
It is a sleeve that seems to be moving when you change the image little by little and pass the pages.
Actually, the beginning of the video image is the same as that of this animated book.
It is said that the film was thrown into the public as a cinematographic film invented by the Lumiere brothers.
The principle was to record 16 images per second in film, print them and reproduce them to record and reproduce the images.
At first, it was a video called silent without audio, but eventually it became a video called Talkie with audio.
At this time, 24 images per second are required to record audio, and the concept of frame speed is born for the first time.
The frame rate is the number of frames (still images) that can be processed per second, and Normally FPS (frames per second) is used, which is the number of frames that can be processed per second.
Since the talkie requires 24 frames per second, the frame rate is 24 fps. The higher the speed of frames, the softer the movement will be, since more frames can be used to reproduce the same movement.
However, increasing the frame rate increases the number of frames processed per second, which results in a large number of film.
Therefore, 24 fps has become the standard for movies.
The next is the birth of television.
There are standards for televisions called PAL and NTSC, but the frame rate is 25 fps for PAL and 29.97 FPS for NTSC.
And in the latest 3D games, etc., the frame rate has increased to 60 fps.
As the content that requires a high speed of frames, such as 4K televisions and 3D movies, it will continue to increase, 120 fps videos are expected to appear.
Frame rate and web conferences
At 15 fps, it is not unnatural if you can only see the upper part of the person who attends the conference, as a web conference, and the movement is not so violent. In addition, in web conferences, audio is more important than video.
In a meeting, the video can be an extreme still image, but the meeting can not be done unless the audio is clearly transmitted.
In addition, since it is necessary to send video and audio in real time, the video frame rate tends to be as low as possible.
It seems that many general web conference systems send videos at 15 fps.
However, some modern systems also admit HD image quality at 30-60 FPS.
Of course, you need a line that can send and receive that amount of data, but you can expect more clear and clear images than conventional web conferences.
