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6.4. Video Quality
The major stream is used for video storage. The minor stream is used for video backup and network
transmission.
1. Resolution
There are 4 kinds of optional resolution in Main stream menu, 1080P, 720P, D1 (PAL), D1 (NTSC), and
2 kinds of optional resolution in Sub stream menu, D1 (PAL), D1 (NTSC).The higher the resolution &
the better the video quality, the larger the video file. Therefore, the configuration should be taken into
account together with the file size.
2. Bit rate
There are 7 levels of bit rates in Main stream and Sub stream menu for selection, 4Mbps, 2Mbps,
1Mbps, 512Kbps, 256Kbps,128Kbps, 64Kbps. The higher the bit rate, the clearer the image, the larger
the video file. Therefore, all factors should be considered comprehensively.
3. Frame rate
There are 5 levels of frame ratesin in Main stream and Sub stream menu for option: 25fps, 20fps,
15fps, 10fps, 5fps. The higher the frame rates is, more smooth the picture is and the larger the video
file is.
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