What is a frame rate? Part 2
Video coding and bit rate
The coding method is also related to the image quality of the video.
When compressed a video, the image quality of the video is determined by the amount of data processed per second, which is called a bit rate.
The same happens with the voice.
This includes both video and audio, so the video bit rate is the sum of the video bit rate and the Audio Bit Rate.
If you configure both at a high bit rate, you will get a beautiful video and video audio, but the size of the video will be great.
In addition, since the bit rate is fixed in a general compression method, if the frame rate increases at the same bit rate, the number of bits in the frame will be reduced accordingly and the quality of the image will deteriorate.
There is also a method called a variable bit rate, in which the bit rate increases when the movement is large and the bit rate decreases when the movement is small, but this requires a large amount of CPU processing for compression / decompression .
In any case, if you do not have enough bandwidth to send and receive, you must maintain the video bit rate at a certain level, and if you do something better, something will go wrong.
Video of the next web conference
First, starting in 2019, the bandwidth of the network is up to 2 Gbps even for domestic lines and optical lines.
Video compression methods are also evolving. For example, as of 2019, H.264, which is a general video compression method, it has double compression speed that MPEG-2, which is a conventional compression method for DVD, etc. That the compression rate will double in H.265, which will be formulated below.
In other words, it can be said that the environment to send and receive videos created at a higher bit rate is much better than the videos used in conventional web conferences.
In the future, it is expected that new systems and improved systems allow higher quality web conferences for both video and audio.
In addition, it will increase the number of people who can participate and the screen, and it will be possible to make a fairly large web conference.
