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Bit rate \/ bit rate<\/p>\n
![\"BitRate\"](\"https:\/\/i.ytimg.com\/vi\/_q8enyv77w4\/maxresdefault.jpg\")
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Bit rate is the amount of data per second. Video quality is determined by factors such as “resolution”, “frame rate”, “bit rate” and “codec”. Bit rate is an important factor related to video quality. Therefore, this time, I will explain the basic knowledge of bit rates required for Internet video distribution.<\/p>\n
” Table of Contents ”<\/p>\n
1. What is a bit rate?
\n2. Relationship between video bit rate and video image quality
\n3. Estimated video bit rate
\n4. Advantages and disadvantages of a high video bit rate
\n1. What is a bit rate?
\nThe amount of data per second is called the bit rate. Use bps as the unit. This is an abbreviation for Bit Per Second. For example, if it is written as 500 kbps, k is 1,000, which means “the amount of data of 500,000 bits per second.”<\/p>\n
There are two types of video bit rates: “video bit rate” and “audio bit rate”. The total value of “video bit rate” and “audio bit rate” is the total bit rate (oval bit rate) of the video file.<\/p>\n
Video Bit Rate \/ Audio Bit Rate<\/p>\n
\u25a0 Voice bit rate
\nThe audio bit rate is the bit rate associated with the audio in the video file. Generally, the audio bit rate is lower than the video bit rate.
\nThe guideline for the audio bit rate is as follows.<\/p>\n
Lossy codecs like MP3, AAC, WMA … 96kbps-128kbps
\nSound quality oriented video … 192 to 320 kbps
\nA codec is a program that encodes (encodes) \/ decodes (decodes) video and audio data. A lossy codec is a codec that dilutes the data and reduces its weight without affecting it. For more information on codecs, see the following.<\/p>\n
[Reference article] What is a codec? Basic knowledge of the codecs required for video distribution.
\n\u25a0 Video bit rate
\nThe video bit rate is the bit rate of the video in the video file. Generally, the video bit rate value is higher than the audio bit rate. The appropriate video bit rate will differ depending on the size of the resolution and the content of the video, such as amount of movement \/ small amount of movement.<\/p>\n
The guideline for video bit rate is explained in “3. Guideline for bit rate”, but the value varies depending on the image quality you want to deliver, such as 500 kps to 70 Mbps. Since the standard for audio is “approximately 96 kbps to 128 kbps”, the video bit rate occupies most of the bit rate of the entire video file.<\/p>\n
It can be said that the higher the value of the video bitrate, the better the image quality, but that does not mean that “the higher the value, the better”. When displayed at a small resolution, the roughness is not as noticeable even if the bit rate is reduced. On the contrary, even if you encode at a high bit rate, you will not notice the difference in image quality, and in many cases the file size will only increase.<\/p>\n
From now on, we will focus on the bitrate of the video.<\/p>\n","protected":false},"excerpt":{"rendered":"