A: Based on a bit-rate of 8 Mbps for a 1080p format video the recording would be taking up approx. 3.6 GB per hour.
How to get to this: This is based on using a 'magically' scaled factor number for how many bits "b"(b) are in a 'byte'(B) worth of size - that magical number seems to calculate out to about in the range of 8 bits per byte up to 8.35 bits per byte, as scaled over the range of sampling rates(more on this below, from some known Netflix data). You could average those numbers and I believe you would be safe with that as a constant for bits per byte.
And so for the above 8Mbps rate this equates to 8,000,000 bps / 8 bytes per bit (in this case I used the 'whole number' magical number from above) = 1,000,000 Bytes per sec (Bps). So 1,000,000 Bps boils down to being 0.001 GigaBytes per sec (GBps) . Taking that further for total size over an hour is 0.001 GBps x 60 sec/min x 60 min/hour = 3.6 GB per hour
More examples for samples follows:
Using Netflix presentations information available on web as an example of something recorded video-wise of theirs into a movie mpg file:
Netflix uses various sampling rates, depending upon the desired quality (higher rate is used for better quality video recording) :
235 kbps (320x240)
375 kbps (384x288)
560 kbps (512x384)
750 kbps (512x384)
1050 kbps (640x480)
1750 kbps (720x480)
2350 kbps (1280x720)
3000 kbps (1280x720)
4300 kbps (1920x1080)
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