![\"bitrate\"](\"https:\/\/cdn.dxomark.com\/wp-content\/uploads\/medias\/post-32912\/shutterstock_1427569001-1-1024x768.jpg\")
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Bit rate<\/p>\n
![\"BITRATE\"](\"https:\/\/static.dw.com\/image\/17389130_6.jpg\")
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In the context of a video, “bit rate” refers to the amount of data bits that the video creates per second, in units of bps (bits per second). The point is “how much information is packed in one second of the video”.<\/p>\n
As a general rule of thumb, everyone knows that the higher the quality of data, like videos, the bigger it gets. If you think of a video as a collection of still images, you can see that there is a lot of “information” that extends the data.<\/p>\n
Screen resolution (1920 x 1080 pix is \u200b\u200bheavier than 640 x 480 pix)
\nAmount of color information (24-bit color is heavier than monochrome)
\nFrame rate (24 fps of general animation is heavier than 5 fps of security camera)
\nVoice quality (heavier with sound than without voice, heavier with high sound quality than with low sound quality)
\nThe more these items are packed, the higher the bit rate and quality of the video. However, the higher the quality, the higher the video capacity.<\/p>\n
A video with a large file capacity places a strain on both the communication line and the processing CPU. When distributing video, it will be necessary to consider “how much quality is required” and select the optimal bit rate for each video content purpose.<\/p>\n
\u25cf Reference: general bit rate example (video \/ audio \/ total standard frame rate)<\/p>\n
High definition digital transmission: 24 Mbps
\nDVD video: 10 Mbps
\nBlu-ray video: 54 Mbps
\nYouTube HD (1080p) Image quality: 1.5-3 Mbps
\nYouTube HD (480p) Image quality: 0.5-2 Mbps
\nIn addition to the frame rate and bit rate discussed so far, there is a data compression technology “codec” as an important factor related to the data capacity of video. This will be discussed later.<\/p>\n
Codec<\/p>\n
It is a word that can be understood in various ways, but in the context of video, it is software that compresses and decompresses audio and video data. I explained that the video will increase in capacity depending on the quality. Even if you want high quality, large files are difficult to handle. That’s where data compression, or codecs, comes into play.<\/p>\n
For video files, the video is compressed using the “video codec” and the audio is compressed using the “audio codec”. There are several types, but typical examples are as follows.<\/p>\n
Video codecs: MPEG-4, MPEG-2, H.264, VP9, \u200b\u200bVP8, Xvid, etc.
\nAudio codecs: MP3, AAC, AC-3, FLAC, LPCM, etc.
\nIt is easy to confuse video file format with codec, but video format is different from codec and is called container. It stands for “container” that combines separate video and audio files into a single file. The codecs that are organized by the container are fixed.<\/p>\n
File format: .mp4 .avi .mov .mpeg .flv, etc.
\nThe most frequently distributed video on the Internet is probably “H.264 \/ MPEG-4 AVC”. There is the advantage that the image quality can be kept as is, even at a low bit rate, and if it is also used on YouTube, it seems to be good to call it the current standard codec.<\/p>\n
Video distribution even with the “internal newsletter app”<\/p>\n
According to a 2018 survey by J-Stream Inc., which provides video distribution services, “ satisfaction with internal public relations is more than 30% overall, but satisfaction is limited to those who frequently view public relations. internal with videos. more than 50%. “By making good use of video content, you may be able to increase the support base of your company’s internal app \/ web newsletter. Please give it a try. Of course, videos can also be distributed using the” internal newsletter “of Wis Works.<\/p>\n","protected":false},"excerpt":{"rendered":"