Generally, the higher the compression ratio is, the poorer the video quality will be. Not only do compression ratios vary from one compression method to another, but hardware and software that perform well on a PC or Mac may be less efficient on a different machine. The more compression, the more likely that quality will be affected. Virtually all compression methods lose some quality when you compress the data. The intraframe method compresses and stores each video frame as a discrete picture.
Compression is started by creating a reference frame.
Each subsequent frame of the video is compared to the previous frame and the next frame, and only the difference between the frames is stored. The amount of data saved is substantially reduced. A good compression system should allow the user to instruct the compression hardware and software which parameters are most important. In some applications, frame rate may be of paramount importance, while frame size is not. In other applications, you may not care if the frame rate drops below 15 frames per second, but the quality of those frames must be of impeccable quality.