There really is no reliable answer to this question. There a far too many variables to take into account in order to provide an answer. The issues that need to be taken into account are: # Whether you are storing video, audio or both # The format you are using # The compression ratio # Frame rate or sample rate # Video resolution or audio bit rate # Various other variables, such as the implementation of the compression format Given these variables, it is enormously difficult to provide even averages.
We can, however use a commonly known baseline; that being YouTube's file formats.
Audio; MPEG layer 3 (MP3):
Standard Quality
* Mono, 22.050 kHz
* ~67 kbps/sec High Quality
* Stereo, 44.100 kHz * 128 kbps/sec Very High Quality * Stereo, 44.100 kHz
* 128 kbps/sec Video; Sorenson Spark (H.263):
Standard Quality * 320 x 240, 15-30 fps
* ~250 kbps/sec High Quality * 320 x 240, 29.97 fps
* 677.7 kbps/sec Very High Quality * 640 x 480, 29.97 fps
* 2019.2 kbps/sec Totals; .flv (flash video):
Standard Quality * ~320 kbits/sec High Quality * 804.7 kbits/sec Very High Quality * 2147.2 kbits/sec
So, based on the totals for the flash video, we can estimate for each level of quality the number of hours per gigabyte.
Hours per Gigabyte:
Standard Quality * 1 gigabyte / 320 kilobits per second = ~26 214.4 seconds
* 26, 214.4 seconds / 60 seconds per minute = ~436.9minutes
* 436.9 minutes / 60 minutes per hour = ~7.2 hours High Quality * 1 gigabyte / 804.7 kbits per second = ~10 424.5seconds
* 10, 424.5 seconds / 60 seconds per minute = ~173.7minutes
* 173.7 minutes / 60 minutes per hour = ~2.8 hours Very High Quality * 1 gigabyte / 2147.2 kbits per second = ~3 906.7 seconds
* 3906.7 seconds / 60 seconds per minute = ~65.1minutes
* 65.1 minutes / 60 minutes per hour = ~1.08 hours
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