Look at the doc of x265 : " When you use faster presets, the encoder takes shortcuts to improve performance at the expense of quality and compression efficiency. For preset, it should be faster = bigger slower = smaller and for QF lower = better higher = worst. With only 3 parameters given by the op (encoder, QF & preset), your golden rule doesn't make any sense. The golden rule has always been longer = better So give it a try and see what works best for you. When encoding and a color has to be picked from a new pallet, 8-bit has fewer colors to pick from, so it goes to what's closest, and this can result in banding unless the bit rate is cranked up. TL DR/ELI5: 10-bit gives more precision to avoid quantization. This is an ELI5 (even though it's referring to H.264, it still applies to HEVC): This study explains why 10-bit is better even with an 8-bit source: You might try using 10-bit even on non-HDR/8-bit source material. The bottom line is that with HEVC, people shouldn't just assume longer is better, but should play around with the settings through a sample of video to see what works best for them. Sometimes the trade-off can be with compatibility, but this shouldn't be an issue with HEVC. The newer profiles can both be faster and deliver a better quality to bit rate ratio. Essentially it has to do with different profiles being used. I've been encoding video on a variety of different platforms with a variety of different codecs, and it's very rare to see this rule being broken. The golden rule has always been longer = better. It's good to see someone else doing this. What exactly is your CPU btw? Is that one of the Intel i9's? Those seem like a bunch of fun :) The conversion time will probably be super painful though. Take a shot and something crazy like veryslow and RF28 to see what the end result is like. To tunedown the filesize, RF adjustment is the way to go. If you run the same settings with the only difference being the speed slider, for H265 you can actually end up with larger files compared to faster settings. The RF setting seems to have a stronger impact on filesize for H265 compared to how H264 works. Losing those opportunities decreases quality while having less of an impact on filesize that you'd think. Especially if you get into tuning down the RF quality a bit (by going with a higher number).īehind the scenes, the speed slider tells ffmpeg to either use or ignore certain types of compression opportunities that requires more CPU resources. I've been doing a lot of 1080p compression and I notice a major difference between veryfast and veryslow. I have studied the results vs the source files in-depth, and I cannot find any substantial difference in video quality.Īgain, I hope this post helps someone out there who is trying to accomplish a similar goal. One 4K REMUX with heavy motion only compressed from 70GB to 52GB. File size does correlate with heavy motion sequences it appears that's where the file size saving is the least. In one case, I was also able to compress a 50GB REMUX down to 11 GB. Generally the file size savings is 50% or higher. With these settings, it takes about 3 hours to fully encode a movie. My hardware is an Intel 16 core / 32 thread processor. (Assuming the source media is HDR): H265 10-bit My goal is, and always has been, to reduce the 4k REMUX file size so that is as small as possible, but yet retains the image as close to the source-quality as possible, as viewed on my 65" Sony Bravia XBR65850 TV. I have spent a monstrous amount of time on this over the past few weeks (thanks to all the similar posts that i have read, as you helped me get to where I am.) I believe I have found the "sweet spot" for H265 encoding, and I hope this post can help others obtain the same goal without having to do all the intense research I did. Please go to the relevant subreddits and support forums, for example: Build help and build shares posts go in their respective megathreads No referral / affiliate links, personal voting / campaigning / funding, or selling posts Welcome to /r/Plex, a subreddit dedicated to Plex, the media server/client solution for enjoying your media! Plex Community Discord Rules Latest Regular Threads: No Stupid Q&A: Tool Tuesday: Build Help: Share Your Build: Submit Troubleshooting Post Files not showing up correctly?
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