How long can a 1GB memory card record?

Answer 1

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

Answer 2

Answer: 36 hours, 25 minutes (approx)

It would depend on the and file format. Let's consider we're using MP3s.

MP3 is a lossy audio codec and as such has a "bitrate". This is the rate at which data is transferred.

You can calculate it as so:

2GB =

2,048MB =

2,097,152KB =

2,147,483,648 bytes

Then we have to decide what we consider to be a standard MP3 file. I'd say that 128kbps is roughly standard quality. (The higher quality, the more bits per second. 320kbps is pretty standard "high quality" for MP3s.)

128Kb =

16KB =

16384 bytes

So, roughly, there are 16384 bytes per second for MP3s.

We have 2,147,483,648 bytes.

This means that we can do a simple arithmetic:

2,147,483,648 / 16384 = 131072

This is the estimated time in seconds.

131072s =

2184.53 minutes

36.41 hours

This means roughly 36 hours and 25 minutes.

Answer 3

Would depend on the actual quality of what is being recorded. Much like VCR cassettes can record short play and long play, where long play is not as good quality.

Answer 4

roughly about 10 minutes on a regular camera

Answer 5

depends on the device that is being used. The results I get with my Video camera is 8.3hrs for 16gb

Answer 6

depends on recording compression format