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\nThe terms codec, resolution, frame rate, and bit rate you often see when creating videos.<\/p>\n
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This is essential basic knowledge for creators whose livelihood is video-related work.<\/p>\n
Basic terms frequently used in video creation
\n1. Image quality (unit: px)
\nVideo quality means the number of pixels.<\/p>\n
The next four are the overall image quality. The numbers represent the number of pixels. (Number of pixels: number of pixels (points) that make up the image)<\/p>\n
SD image quality: 720 x 480
\nHD image quality: 1280 x 720
\nFull HD: 1920 x 1080
\n4K: 4096 x 2160
\n8K: 7680 x 4320
\nThe higher the number of pixels, the more beautiful the image will be, but the heavier the data will be. Considering the number of pixels and the amount of data, HD image quality is standard at the moment.<\/p>\n
YouTube displays 1080p, which is Full HD, as standard. Since 1080p is compatible with the progressive 1920 x 1080 high definition picture quality used in other TV receivers, it is said to take progressive p.<\/p>\n
YouTube provides images with different resolutions depending on the viewer’s device. Also, if you play a video in an environment with a slow line, the image quality will automatically decrease.<\/p>\n
Bit rate (unit: bps)
\nBit rate means the amount of data per second. Since the amount of data includes video and audio, the higher the bit rate, the higher the image quality and sound quality. Also, the higher the frame rate (explained below), the higher the bit rate.<\/p>\n
The higher the bit rate, the better the picture and sound quality.
\nIf the bit rate is high, the network and the playback terminal will be overloaded.
\nEven if you increase the bit rate, the image quality and sound quality will not be higher than the original video material.
\nThe bit rate unit is as follows.<\/p>\n
Kilobits per second (kbps, kb \/ s, 10 bps at third power)
\nMegabits per second (Mbps, Mb \/ s, 10 bps to the sixth power)
\nGigabit per second (Gbps, Gb \/ s, 10 bps to the 9th power))
\nTerabit per second (Tbps, Tb \/ s, 10 bps to 12)<\/p>\n
Frame rate (unit: fps)
\nFrame rate means how many still images are used in one second video. For example, 30 fps means “30 still images are used per second”. Recently, 60fps has been added to cameras. If you duplicate the image taken, the image that is comparable to the general 30fps will have the image quality that you can see if the image is stable even in slow motion. The higher the frame rate, the more still images will be used per second and the smoother the movement will be when viewed in video.<\/p>\n
On the iPhone 6S, it’s 30fps when shooting in 4k and 60fps when shooting in Full HD. In the case of a movie, 24 frames per second are played, making it 24 fps.<\/p>\n
The higher the frame rate, the higher the data, but since the frame rate of the screen playing the video is fixed, even if you increase the frame rate of the video itself, it will not be drawn at that rate.<\/p>\n","protected":false},"excerpt":{"rendered":"