Remember, in SV mode the camera will not change the shutter speed you select. It will work everything else around that specific shutter speed. Eventually, if it thinks that it cannot take a good picture at the particular shutter speed no matter what other options it selects, it will give you all kinds of warnings. Red flashing lights, sirens, who knows. But it will not change the shutter speed you chose.
In Program Mode you have no control over the actual shutter speed and, although the camera will try to keep it as fast as it can for as long as it can, eventually it will change it and slow it down if it decides it needs more light to get a proper exposure.
Summary...in SV Mode, you are in control of a very specific shutter speed you have chosen and the camera will not change it. In Program Mode you can suggest what you would prefer, but in the end you don't have control, the camera does, and it will change anything it can to get the picture, even your shutter speed in the end.
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