4 ms·
> 4GiB of completely uncompressed 1080p video in memory is only 86 frames How is that data stored? Because (2^32)÷(1920×1080×4) = 518 which is still low but n
by gertop 1y ago
> 4GiB of completely uncompressed 1080p video in memory is only 86 frames
How is that data stored?
Because (2^32)÷(1920×1080×4) = 518 which is still low but not 86 so I'm curious what I'm missing?
- 05 1y agoApparently with 24 bytes per pixel instead of bits :) Although to be fair, there's HDR+ and DV, so probably 4(RGBA/YUVA) floats per pixel, which is pretty close..
- brokencube 1y agoI would guess 3 colour channels at 16bit (i.e. 2 bytes) (2^32)÷(1920×1080×4×3×2) = 86
- TheBicPen 1y agoWhere does the 4 come from? I thought it was R+G+B+A, but you already have 3 colour channels in that calculation
- brokencube 1y agoYep, my logic is faulty there. And even if we assume that it's 24bpp color, that's still a factor of 2 out.
- jjcm 1y ago> How is that data stored? So glad you asked. It's stored poorly because I'm bad at maths and I'm mixing up bits and bytes. That's what I get for posting on HN while in a meeting.