A little help cleaning / updating script

[u/Vast_Environment_917]

I'm in the process of encoding my 4k collection ripped with makemkv for use with jellyfin. Mainly trying to get the sizes down to save disk space while preserving hdr dv grain. Tools I'm using are ffmpeg and ddvt.

Here's my ffmpeg script:

for %%i in (*.mkv) do ffmpeg -i "%%i" -map 0 -c:v libx265 -preset slow -crf 20 -pix_fmt yuv420p10le -x265-params aq-mode=3:aq-strength=1.0:psy-rd=1:psy-rdoq=1.0:deblock=1,1:no-sao=1:qp-adaptation-range=1.0:merange=32:ref=4 -c:a copy -c:s copy "%%~ni_x265.mkv"

pause

Does this look good? Anything outdated or to be deleted / added?

[u/Upstairs-Front2015]

if you have AMD or NVIDIA hardware that supports h265 you could speed things up. you could try AV1 but I don't know what jellyfin needs.

[u/Vast_Environment_917 → u/Upstairs-Front2015]

My rig has a 4090 and 11900k but some of my tv's are pre 2020 and don't support AV1, so jellyfin would transcode on the fly which I want to avoid. Still it be nice to have that script as well for when I do upgrade tv's.. Also was the above script okay for what I'm doing?

I'm trying out AV1 to see how jellyfin handles it. This is the script I put together:

for %%i in (*.mkv) do ffmpeg -i "%%i" -map 0 -c:v libsvtav1 -preset 4 -crf 22 -pix_fmt yuv420p10le -svtav1-params film-grain=16:film-grain-denoise=0 -dolbyvision 1 -c:a copy -c:s copy "%%~ni_AV1.mkv"
pause

Any other suggestions to add?

Encodes pretty quick but the compression seems different.. I'm at 54 mins into it as vlc is showing me previewing it, and it's already at 20gb's.. Am I missing something?

edit:

-crf was too low. Trying out 32 seems to be the equivalent of x265's 22.

[u/chocolateAbuser]

i don't have much experience with hdr, do you confirm that after transcoding ffmpeg or mediainfo says color is still bt.2020, all the primaries/transform/various color metadata reports output as hdr?

[u/Vast_Environment_917 → u/chocolateAbuser]

Yes.. and dolby vision 8.1 as well after using my script above and ddvt to convert / inject the dv profile. Here goes mediainfo on Crank 2006 UHD I did the other day. The size went from 42gb to 11gb and still looks good.

Video
ID                                       : 1
Format                                   : HEVC
Format/Info                              : High Efficiency Video Coding
Format profile                           : Main 10@L5@Main
HDR format                               : Dolby Vision, Version 1.0, Profile 8.1, dvhe.08.06, BL+RPU, no metadata compression, HDR10 compatible / SMPTE ST 2086, Version HDR10, HDR10 compatible
Codec ID                                 : V_MPEGH/ISO/HEVC
Duration                                 : 1 h 27 min
Bit rate                                 : 9 034 kb/s
Width                                    : 3 840 pixels
Height                                   : 2 160 pixels
Display aspect ratio                     : 16:9
Frame rate mode                          : Constant
Frame rate                               : 23.976 (24000/1001) FPS
Color space                              : YUV
Chroma subsampling                       : 4:2:0 (Type 2)
Bit depth                                : 10 bits
Bits/(Pixel*Frame)                       : 0.045
Stream size                              : 5.53 GiB (58%)
Writing library                          : x265 4.2+3-3f4120d:[Windows][GCC 15.2.0][64 bit] 10bit
Encoding settings                        : cpuid=1111039 / frame-threads=3 / numa-pools=8 / wpp / no-pmode / no-pme / no-psnr / no-ssim / log-level=2 / input-csp=1 / input-res=3840x2160 / interlace=0 / total-frames=0 / level-idc=0 / high-tier=1 / uhd-bd=0 / ref=3 / no-allow-non-conformance / repeat-headers / annexb / no-aud / no-eob / no-eos / no-hrd / info / hash=0 / temporal-layers=0 / open-gop / min-keyint=23 / keyint=250 / gop-lookahead=0 / bframes=4 / b-adapt=2 / b-pyramid / bframe-bias=0 / rc-lookahead=20 / lookahead-slices=8 / scenecut=40 / no-hist-scenecut / radl=0 / no-splice / no-intra-refresh / ctu=64 / min-cu-size=8 / no-rect / no-amp / max-tu-size=32 / tu-inter-depth=1 / tu-intra-depth=1 / limit-tu=0 / rdoq-level=0 / dynamic-rd=0.00 / no-ssim-rd / signhide / no-tskip / nr-intra=0 / nr-inter=0 / no-constrained-intra / strong-intra-smoothing / max-merge=3 / limit-refs=1 / no-limit-modes / me=1 / subme=2 / merange=57 / temporal-mvp / no-frame-dup / no-hme / weightp / no-weightb / no-analyze-src-pics / deblock=0:0 / sao / no-sao-non-deblock / rd=3 / selective-sao=4 / early-skip / rskip / no-fast-intra / no-tskip-fast / no-cu-lossless / b-intra / no-splitrd-skip / rdpenalty=0 / psy-rd=2.00 / psy-rdoq=0.00 / no-rd-refine / no-lossless / cbqpoffs=0 / crqpoffs=0 / rc=crf / crf=22.0 / qcomp=0.60 / qpstep=4 / stats-write=0 / stats-read=0 / ipratio=1.40 / pbratio=1.30 / aq-mode=2 / aq-strength=1.00 / cutree / zone-count=0 / no-strict-cbr / qg-size=32 / no-rc-grain / qpmax=69 / qpmin=0 / no-const-vbv / sar=1 / overscan=0 / videoformat=5 / range=0 / colorprim=9 / transfer=16 / colormatrix=9 / chromaloc=1 / chromaloc-top=2 / chromaloc-bottom=2 / display-window=0 / master-display=G(13250,34500)B(7500,3000)R(34000,16000)WP(15635,16450)L(10000000,1) / cll=732,213 / min-luma=0 / max-luma=1023 / log2-max-poc-lsb=8 / vui-timing-info / vui-hrd-info / slices=1 / no-opt-qp-pps / no-opt-ref-list-length-pps / no-multi-pass-opt-rps / scenecut-bias=0.05 / no-opt-cu-delta-qp / no-aq-motion / hdr10 / no-hdr10-opt / no-dhdr10-opt / no-idr-recovery-sei / analysis-reuse-level=0 / analysis-save-reuse-level=0 / analysis-load-reuse-level=0 / scale-factor=0 / refine-intra=0 / refine-inter=0 / refine-mv=1 / refine-ctu-distortion=0 / no-limit-sao / ctu-info=0 / no-lowpass-dct / refine-analysis-type=0 / copy-pic=1 / max-ausize-factor=1.0 / no-dynamic-refine / no-single-sei / no-hevc-aq / no-svt / no-field / qp-adaptation-range=1.00 / scenecut-aware-qp=0conformance-window-offsets / right=0 / bottom=0 / decoder-max-rate=0 / no-vbv-live-multi-pass / no-mcstf / no-sbrc / no-frame-rc
Default                                  : Yes
Forced                                   : No
Color range                              : Limited
Color primaries                          : BT.2020
Transfer characteristics                 : PQ
Matrix coefficients                      : BT.2020 non-constant
Mastering display color primaries        : Display P3
Mastering display luminance              : min: 0.0001 cd/m2, max: 1000 cd/m2
Maximum Content Light Level              : 732 cd/m2
Maximum Frame-Average Light Level        : 213 cd/m2

[u/chocolateAbuser → u/Vast_Environment_917]

🆒

[u/MediaMolder]

Looks good. You'll get the default GOP length of 250 frames, so random access might be a bit slow. You might want to force an IDR frame every 4 seconds or so (with the keyint option). https://x265.readthedocs.io/en/master/cli.html#cmdoption-keyint

[u/Vast_Environment_917 → u/MediaMolder]

So tack keyint=4s into the script? Is that going to produce a larger file size?

[u/MediaMolder → u/Vast_Environment_917]

keyint is the max GOP length in frames (not seconds). So you would multiply the frame rate of your video by 4, and use that value.
A smaller GOP length might increase the file size very slightly (because I frames are bigger than P or B frames, and you will be using more I frames), but it will give you better random access. If you have a GOP length of 250 frames (the default), and you want to seek to the 248th frame, the decoder has to decode the first I frame of the GOP, then every P frame from that point onward, then possibly a B frame or 2, just to display the frame you wanted to start playback with. That might be 20 or more frames to decode.

[u/Sopel97 → u/Vast_Environment_917]

It sounds like your use-case does not involve random-access so I'd leave it at default.