what is different about H.265 8K and original 8k

JohnCC

Original file is uncompressed. They are nearly indistinguishable from each other in the quest 2. I’ve done quite a few A/B comparisons and literally can’t tell the difference. I will only download the full original file if it’s a performer/release I’m really excited about. Even then I won’t do it if the file size disparity is gigantic. But if the original is in the 10-15GB range and the .265 is around 5GB.. I’ll spring for the original.

I'd say the main difference is the bitrate because usually both files are h.265. The smaller files have bitrates of max. 30 Mbps, while the 'original' can go up to 200 Mbps.

In case of non-SLR studios, the original file is the file that the external studio provides. If studios have their own website, it is usually the highest quality file that you will get there if you have subscription.

SLR is reducing the sizes of original files and I understand they do it to reduce traffic and to ensure a good streaming experience. There seem to be two rules to how they reduce file sizes:

• Any file with bitrates up to 75 Mbps will be reduced to approx. 40 % of its original size. So if the original video has 50 Mbps, the SLR reduced size version will have a bitrate of 20 Mbps.
• Any file with bitrates higher than 75 will be downsized even more to reach the max. allowed bitrate of 30 Mbps. So if the original has 120 Mbps, it will be reduced to 25 % of its original size to reach 30 Mbps.

One thing I do not get at all is why SLR insists to reduce 50 Mbps files to 20 Mbps instead of making all files 30 Mbps. 20 Mbps will lead to significantly inferior quality.

One example:
https://www.sexlikereal.com/scenes/7sins-greed-36359?tab=downloads

• Original is 50 Mbps
• SLR reduces file size to 42 % (from 17.36 GB to 7.34 GB), resulting in a bitrate of approx. 21
• To ensure better video quality, SLR could reduce only to 30 Mbps, resulting in a 10.4 GB file.

I think there is absolutely no need to substantially decrease the quality of 50 Mbps files which are already relatively small just to save 3 GB of traffic which is nothing in the grand scheme of things. But that's how it's done.

SLR edits and cuts down the bitrates of all 3rd party videos, even 8K scenes get cut down to 20-25 mbps which is ridiculous in my opinion. At the same time they're in-house productions along with StasyQ which are predominately 6K are mostly 30 mbps. Pretty much every studio out there that is producing 8K content (Fuckpass, CVR, VRB, LHVR) have bitrates in the 60-80 mbps range. Cutting the bitrate by 75% is most definitely going to have an effect on visual quality and I'm sure SLR knows it. Perhaps a person may not notice it as much when streaming but for local files viewed on a high res hmd such as the HP G2 it is noticeable. Why does SLR use higher bitrates for their own smaller resolution files?