Timeline for Why don't digital cameras shoot video at full sensor resolution, or do continuous drive at video framerates?
Current License: CC BY-SA 3.0
9 events
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| Nov 19, 2016 at 5:45 | comment | added | AJ Henderson♦ | @Crashalot - there's two different values that matter, the data rate coming off the sensor and the data rate being actually written to storage. Unless I missed something, the iPhone has 8 bit color depth, so it's only dealing with 110 MBPS of raw data off the sensor and then is compressing it in hardware before storage down to a much, much smaller amount of data. | |
| Nov 19, 2016 at 5:42 | history | edited | AJ Henderson♦ | CC BY-SA 3.0 |
maths was wrong
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| Nov 19, 2016 at 3:05 | comment | added | Crashalot | For instance, the iPhone can shoot 720p @120 FPS. Does that mean it's processing ~110 MP/s (1280 x 720 x 120) for a full data rate of 194 MB/s (110M * 14 bits/pixel * .125 bits/byte)? | |
| Nov 19, 2016 at 2:41 | comment | added | Crashalot | Also any sites you suggest for understanding the price/performance of different SoC? Looking at making a custom camera so trying to understand the trade-offs, hence all the questions. Thanks for your help! | |
| Nov 19, 2016 at 2:39 | comment | added | Crashalot | Thanks for the quick response, @AJ Henderson! Quick clarification: Shouldn't 864 megabytes/sec be ~ 1 gigabytes/sec (10^6 * 14 * 24 * 24 / 8)? Just trying to nail the math to understand the upper bound of what's possible today. Thanks again for your help! | |
| Nov 19, 2016 at 2:20 | comment | added | AJ Henderson♦ | @Crashalot for consumer video, yes. High end SSDs are fast enough, but the amount of data consumed is still astronomical so it would require a very large cost and very high end professional equipment to do. This has actually been true for a while now as 8k cameras have been a thing on the high end professional side for a while now and 8k is a little over 33 MP of resolution. SD cards are either at or getting close to the lower end threshold for speed, but data size is still an issue. | |
| Nov 19, 2016 at 1:48 | comment | added | Crashalot | Thanks for the detailed answer. Is all this true today, specifically that there's no way to store video from a 24 MP sensor without downsampling? | |
| Oct 18, 2013 at 3:31 | history | edited | AJ Henderson♦ | CC BY-SA 3.0 |
added 675 characters in body
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| Oct 18, 2013 at 3:11 | history | answered | AJ Henderson♦ | CC BY-SA 3.0 |