This one has over 20% smaller video size than using the x264 10bit encoding.

Quote:

Writing library : x265 1.5+186-043c2418864b:[Windows][MSVC 1800][64 bit] 16bpp

Encoding settings : wpp / ctu=64 / min-cu-size=8 / max-tu-size=32 / tu-intra-depth=3 / tu-inter-depth=3 / me=3 / subme=5 / merange=25 / no-rect / no-amp / max-merge=4 / temporal-mvp / no-early-skip / rdpenalty=0 / no-tskip / no-tskip-fast / no-strong-intra-smoothing / no-lossless / no-cu-lossless / no-constrained-intra / no-fast-intra / no-open-gop / no-temporal-layers / interlace=0 / keyint=900 / min-keyint=1 / scenecut=40 / rc-lookahead=72 / bframes=9 / bframe-bias=0 / b-adapt=2 / ref=5 / weightp / weightb / aq-mode=2 / aq-strength=1.10 / cbqpoffs=0 / crqpoffs=0 / rd=5 / psy-rd=0.90 / psy-rdoq=4.00 / signhide / lft / no-sao / no-sao-non-deblock / b-pyramid / cutree / rc=crf / crf=15.5 / qcomp=0.80 / qpmin=0 / qpmax=51 / qpstep=4 / ipratio=1.40 / pbratio=1.30

mediainfo
General
Unique ID : 174788462836673002747708973883812195917 (0x837F08903F9949A3AB4279C442B3AE4D)
Complete name : F:\[philosophy-raws][ToHeart2 OVAs]\[philosophy-raws][ToHeart2 OVAs][01][BDRIP][HEVC Main10P FLAC][1920X1080].mkv
Format : Matroska
Format version : Version 4 / Version 2
File size : 443 MiB
Duration : 27mn 31s
Overall bit rate mode : Variable
Overall bit rate : 2 252 Kbps
Encoded date : UTC 2015-03-08 07:55:52
Writing application : mkvmerge v7.7.0 (‘Six Voices’) 64bit built on Mar 3 2015 14:40:15
Writing library : libebml v1.3.1 + libmatroska v1.4.2
_STATISTICS_WRITING_APP : mkvmerge v7.7.0 (‘Six Voices’) 64bit built on Mar 3 2015 14:40:15
_STATISTICS_WRITING_DATE_UTC : 2015-03-08 07:55:52
_STATISTICS_TAGS : BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
DURATION : 00:27:31.650000000
NUMBER_OF_FRAMES : 39600
NUMBER_OF_BYTES : 326009452

Video
ID : 1
Format : HEVC
Format/Info : High Efficiency Video Coding
Codec ID : V_MPEGH/ISO/HEVC
Duration : 27mn 31s
Width : 1 920 pixels
Height : 1 080 pixels
Display aspect ratio : 16:9
Frame rate mode : Constant
Frame rate : 23.976 fps
Default : Yes
Forced : No

Audio
ID : 2
Format : FLAC
Format/Info : Free Lossless Audio Codec
Codec ID : A_FLAC
Duration : 27mn 31s
Bit rate mode : Variable
Channel(s) : 2 channels
Sampling rate : 48.0 KHz
Bit depth : 16 bits
Writing library : libFLAC 1.3.1 (UTC 2014-11-25)
Language : Japanese
Default : Yes
Forced : No

Menu
00:00:00.000 : en:00:00:00.000
00:04:11.877 : en:00:04:11.877
00:05:46.096 : en:00:05:46.096
00:24:14.662 : en:00:24:14.662
00:25:53.594 : en:00:25:53.594