Why the SD mirror recording is much smaller than the regular recording of the main stream

2020-03-06 FAQ 434 views wuqianyun

When you set the main code for main stream recording and mirror recording like the following settings, use same  D1 resolution, 25fps, 3rd quality of image.

Why the SD mirror recording is much smaller than regular of main stream Picture1

Why the SD mirror recording is much smaller than regular of main stream Picture2

When check the video information, the size of the video is different, mirror record video is smaller than main code record.

The reason is because that conventional main stream uses a static bit rate(CBR), and the mirrored is a dynamic bit rate(VBR). When the picture is still, the mirrored video under the dynamic bit rate will occupy little storage space.

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Why the SD mirror recording is much smaller than regular of main stream Picture3Why the SD mirror recording is much smaller than the regular recording of the main stream.docx

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