Can You Connect 1080p SDI Cameras Into a 720p HD SDI DVR?

Hi
Can one connect a 1080P SDI camera to a 720P DVR and still get acceptable recording performance?

I know that the answer should be 'yes' but am not sure of the technical implications here.

Obviously 1080P has a higher bitrate than 720P to start with.
Seeing that SDI DVRs do the decoding at the DVR end, it means that the DVR has to work hard and becomes more expensive as the channels rise.

However, if one has a 720P DVR and it receives a 1080P stream, does it just drop frames, or does it do the decoding and simply convert the 1080P stream to an internal 720P stream?

What are the reasons why one would not want to do this?

The cost of a 1080P DVR is quite a bit higher than a 720P DVR. However, there is little difference in cost between 720P and 1080P SDI cameras. So it makes sense for us to buy 1080P SDI cameras so that they can be connected to a range of DVRs

Thanks!

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