4 ms·
Modern SD cards go up to 300 MB/s for writes. That should be enough. Even if you dump the pixel data with zero compression. 8-bit pixels: 1920x1080x30 = 62.2 M
by bufferoverflow 9y ago
Modern SD cards go up to 300 MB/s for writes. That should be enough. Even if you dump the pixel data with zero compression.
8-bit pixels: 1920x1080x30 = 62.2 MB/sec
14-bit: 109 MB/s
Even UHD in 8 bits should work.
- kurthr 9y agoI think if you're Raw spatialy down-sampled you'll want RGB and not Bayer under-sampled so triple that. No SD is reasonably over 250MB/sec and they are all 64GB. Even at FHD 30Hz you'll only get 30sec of 8bit (not really Raw) video on your insane SD card. https://havecamerawilltravel.com/photographer/fastest-sd-cards/ https://havecamerawilltravel.com/photographer/fastest-sd-car...
- bufferoverflow 9y agoNo, that makes no sense. Why would you store debayered data when you can store the original with the same exact results?
- kurthr 9y agoYou realize that Bayer data counts every column and row whether R G or B, right? Half the pixels (21Mpix) are green and the other 2 quarters are R and G. So if you're going down to FHD (2kx1k) from 42Mpix (8kx5k) you have already lost massive ammounts of resolution (and noise). Bayer FHD would be SPR (sup-pixel rendered) and even lower resolution (1/3 RGB e.g. 1080 lines of 1920 RG/BG alternating columns) than most JPEG FHD (natural scene) not suitable for video compression much less Raw. That would be silly. If you don't down-sample the data somehow you can't even get it off the CIS which are limited to ~2-5Gb/sec. Since most reasonable image sizes are large enough you can see color at full resolution we typically use RGB at FHD, compressed or not. Alternately, you can go to 4:4:4 to 4:2:2 or even 4:1:1 in Yuv (YCbCr), but that's not Raw or anything like it.
- deleted 9y ago[deleted]