HEVC/H265 profile

(Diego) #1

Hi everyone, I’m here asking for you help after some days of struggle and various test (Mary Poppins hates me for how many times I re-encoded it :stuck_out_tongue: )
I tried to modify the standard HEVC MKV profile and also a custom MKV HEVC Constant Quality profile I found on the forum. I cannot achieve what I’m trying to do.
I have this example movie 1080p / 10796kbps H264 (High @L4.1) in an MKV format (almost 10GB) and I would like to re-encode it with H265 for space optimization. What I got is an mkv/h256 that is 2GB with a significant loss of quality. What would be nice is to not lose so much quality. I’m talking about a 5/6GB on the final version with a correct compromise between quality and visual satisfaction.
I tried to play with “-cq 17” and “-crf 16” that if I understand it correctly “less the number = more quality”, but I noticed no difference in the file size (always 2Gb) even if the number is bigger like 23/25.

As you can imagine I’m not a profile guru and I have only some understanding of what I’m doing, so if somebody is willing to share with me a good h265 profile and a short explanation on what parameter should I “play with” it would be very nice.
My goal is to reduce a 10Gb h264 movie to a 5/6Gb h265 that is great to watch in 1080p (if that is even possible).

Thank you very much for any help.

(Goose) #2

Try using the quality slider in the Conversion Task page instead of adjusting the values directly in the profile, it has a similar effect but easier to control. Also recommended to attach your conversion log to help see what’s going on.

(Lester Thomas) #3

I use the default H265 profile with the quality slider at +20. That seems to me to give a good balance of quality and size. That’s converting broadcast files.