What is the bit rate, which is said to be indispensable for video distribution? Part 2
Advantages and Disadvantages of Setting a High Video Bitrate
# There are merits such as being able to offer clearer images
One of the merits of increasing the video bitrate value is that it can deliver clearer videos and even video with intense motion without generating block noise. Block noise is a phenomenon in which part or all of the image is altered to form a mosaic in the shape of a square block. Another advantage of the high video bit rate is that it can increase the number of frames and deliver smooth video.
#There are disadvantages such as not being able to play fluently
The higher the bit rate of the video, the clearer the video can be, but the size of the video file also increases accordingly. A disadvantage is that if the size of the video file is large, it may not be possible to play it smoothly depending on the Internet environment of the viewer when distributing the video on the Internet.
Also, the larger the size of the video file, the greater the amount of communication when viewing it, and the storage capacity of the distribution server will be affected to some extent. If there is no spec that can handle even higher bitrates, the CPU is more likely to be overloaded and the risk of video freezing increases. If you want to distribute or view high bit rate video, you must prepare an Internet connection and a computer that can handle it.
What are the factors that affect the image quality of the videos?
#frames per second
Frame rate is a unit that expresses how many frames, such as still images and frames, can be displayed per second.
The unit is called frames per second, which means that 100 frames per second can be displayed, for example at 100 fps. 30 fps is often selected for Internet video distribution. For videos with little movement, such as seminars and online classes in intensive schools, it is possible to reproduce them smoothly even at 15 fps.
The higher the resolution, the higher the video quality, but the higher the video bitrate value. Also, the higher the frame rate, the smoother the motion of the video. However, simply increasing the value of the frame rate will reduce the percentage of the amount of data per frame, so the bit rate should be set to a higher value.
#resolution
Video resolution refers to pixels and is expressed as vertical x horizontal pixels, such as 1920 x 1080px. The higher the number, the higher the resolution and image quality, but the optimal resolution can be selected according to the viewing environment. As with frame rate, the higher the resolution, the higher the required bit rate.
#Codec
A codec is a program that encodes or decodes audio and video data. Codecs are used in recording media such as DVD, Blu-ray, and hard disk recorders, and they are familiar to us because they are used in various places in our daily lives. Codecs are also used when handling video in digital broadcasts and video conferences. There are various types of codecs that influence such videos, video, and audio.
There are H.264, H.265, MPEG-2, etc. for video and MP3, AAC, etc. as typical audio codecs. To distribute video on the Internet, it is necessary to use these codecs to perform encoding work such as converting the video so that it can be viewed on a terminal such as a personal computer or smartphone and compressing the data.
Relationship between YouTube and bitrate
YouTube has a feature called YouTube Live that can deliver videos in real time. At this time, the bit rate, etc. they become important points. The required data capacity and image quality will be determined by what you use to shoot and how it will be sent to YouTube Live. For example, you can use YouTube Live on your smartphone.
However, the image quality and the video sound quality will be very different even if the smartphone model is different. Specifically, if the number of pixels of one smartphone is 1 million pixels and the number of pixels of another smartphone is 10 million pixels, the data capacity required for a display configuration when calculated by calculating the bit rate is 10 times higher. different.
YouTube side automatically detects the device used for shooting and sets it in settings
