Quality settings for Bu-ray quality recordings?

[The_Great_Sephiroth]

I recently upgraded our church's AV system. We run four PTZ Optics 1080p60 SDI cameras and a portable, 4K60 camera that we use in 1080p60 mode. The cameras are all SDI and go to an SDI mixer and an SDI matrix. The final signal is sent to two high-end PCs, both running DeckLink 4K capture cards and OBS Studio. Each rig has a 1TB disk solely for recording to and another one for the OS and software. The captured image in OBS is gorgeous, and we both stream to YouTube and make a local recording. The local recordings are then moved to a Synology BTRFS RAID10 NAS where they can be edited into chapters and such, and burned to Blu-ray discs.

Our stream has zero issues, but I am struggling to find a good quality for our Blu-ray recordings. Currently I am using x264, faster preset, CRF at 8, keyframes at 2s, profile high, and no tune. This works fairly good, but our recordings are huge. If this is how it has to be, so be it. I can order a 4TB disk for recording if need-be, but I was hoping for that kind of quality with a lower file-size, maybe due to another group of settings. Is this going to be possible?

Oh, we also send the final SDI signal to an ATSC encoder for broadcast, and that looks good too.

 

[The_Great_Sephiroth]

I'm surprised that nobody has said anything after four days. Let's go at this angle. What kind of CPU would I need to run x264 encoding on medium or slow? I assume that will produce a better quality image as well as compressing better. If not, what can I do to get a virtually lossless image with some level of compression on it? Currently we're using about 40GB per hour in 1080p30 recordings.

 

[R1CH]

A CRF of 8 is really high quality, you can probably go to 15 - 20 without any noticeable quality loss and much smaller files. You could also try recording losslessly and then transcoding the file at a slower presets since you aren't limited by real-time encoder performance.

 

[The_Great_Sephiroth]

I did not see the lossless option. I have used that in the past but thought that it was removed. I'll check the next time I am at the church. I've been struggling with murder-level allergies the past week and have been unable to do much.