3 ms·
Video editing is not sequential by any means, I can maybe give that to encoding / transcoding an existing file on disk (if both the disk and the file system can
by dogma1138 8y ago
Video editing is not sequential by any means, I can maybe give that to encoding / transcoding an existing file on disk (if both the disk and the file system can ensure that a file in the 100's of GB or even a few TB's in size can be sequential) but with editing you jump back and forth between a multitude of different frames across the entire timeline of the video in the file each of those frames is a few MB's in size at these resolutions and at these file sizes it's effectively the same as randomly accessing small files on an HDD which is never exactly fast.
- Dylan16807 8y agoIn the absolute worst case of frames that are on opposite ends of the disk and compressed to 20MB each, you're still spending less than 20% of your time seeking. When you take random-access and make the data chunks big enough, it becomes sequential-access. Raw 8k footage is above this threshold.
- dogma1138 8y agoTry editing a 4K raw video on an HDD and come back to me it’s nearly utterly impossible to do so without high double digit dropped frame count.
- Dylan16807 8y agoIn general, for raw 4k, a single HDD doesn't have enough bandwidth, and a single SSD isn't big enough. But the main advantage of the SSD, IOPS, becomes less and less important as bitrates increase. As you go bigger and bigger, using storage arrays no matter what drive tech, hard drives start to be able to perform perfectly fine at lower price levels, while also fitting much more data.