So it’s been a few months since doing some HD Upscales to 4K. I normally take my BT.709 sources and convert them BT.2020 and degrain them using SMDegrain before running them through Video AI.
I had been staying on version 4…0.4 and the output using Prores as the container. I know that Topaz’s pipeline is BT.709, but somehow using BT.2020 Prores container removed the banding I was seeing in certain scenes, especially underwater or skies.
Mediainfo for Video:
V
ideo
ID : 1
Format : ProRes
Format version : Version 0
Format profile : 422 LT
Codec ID : apcs
Duration : 2 h 26 min
Bit rate mode : Variable
Bit rate : 276 Mb/s
Width : 3 840 pixels
Height : 1 608 pixels
Display aspect ratio : 2.40:1
Frame rate mode : Constant
Frame rate : 23.976 (24000/1001) FPS
Color space : YUV
Chroma subsampling : 4:2:2
Scan type : Progressive
Bits/(Pixel*Frame) : 1.866
Stream size : 282 GiB (99%)
Title : Man on Fire (2004) HD
Writing library : Apple
Encoded date : 2024-07-14 17:29:08 UTC
Tagged date : 2024-07-14 17:29:08 UTC
Color primaries : BT.2020
Transfer characteristics : BT.2020 (10-bit)
Matrix coefficients : BT.2020 non-constant
Menus : 4
While 4.1.0 shows tihs:
Video
ID : 1
Format : ProRes
Format version : Version 0
Format profile : 422 LT
Codec ID : apcs
Duration : 2 h 26 min
Bit rate mode : Variable
Bit rate : 276 Mb/s
Width : 3 840 pixels
Height : 1 608 pixels
Display aspect ratio : 2.40:1
Frame rate mode : Constant
Frame rate : 23.976 (24000/1001) FPS
Color space : YUV
Chroma subsampling : 4:2:2
Scan type : Progressive
Bits/(Pixel*Frame) : 1.866
Stream size : 282 GiB (99%)
Title : Man on Fire (2004) HD
Writing library : Apple
Encoded date : 2024-07-14 17:29:08 UTC
Tagged date : 2024-07-14 17:29:08 UTC
Color primaries : BT.2020
Transfer characteristics : BT.2020 (10-bit)
Matrix coefficients : BT.2020 non-constant
matrix_coefficients_Original : BT.709
Menus : 4
That new line “matrix_coefficients_Original: BT.709” is causing x265 to actually using BT.709 when I encode the Prores to x265 using Fatflix:
x265 output:
Video
ID : 1
Format : HEVC
Format/Info : High Efficiency Video Coding
Format profile : Main 10@L5@Main
Codec ID : V_MPEGH/ISO/HEVC
Duration : 2 h 26 min
Bit rate : 11.0 Mb/s
Width : 3 840 pixels
Height : 1 608 pixels
Display aspect ratio : 2.40:1
Frame rate mode : Constant
Frame rate : 23.976 (24000/1001) FPS
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 10 bits
Bits/(Pixel*Frame) : 0.074
Stream size : 11.2 GiB (98%)
Writing library : x265 3.5+98-753305aff:[Windows][GCC 12.2.0][64 bit] 10bit
Encoding settings : cpuid=1111039 / frame-threads=5 / numa-pools=32 / wpp / no-pmode / no-pme / no-psnr / no-ssim / log-level=2 / input-csp=1 / input-res=3840x1608 / interlace=0 / total-frames=0 / level-idc=0 / high-tier=1 / uhd-bd=0 / ref=3 / no-allow-non-conformance / no-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=17.0 / 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=14 / colormatrix=9 / chromaloc=0 / display-window=0 / cll=0,0 / 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 / no-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
Default : Yes
Forced : No
Color range : Limited
Color primaries : BT.2020
Transfer characteristics : BT.2020 (10-bit)
Matrix coefficients : BT.709
matrix_coefficients_Original : BT.2020 non-constant
Not sure what changed from 4.0.4 to 4.10. Maybe it’s not a Video AI problem but maybe it is FFMPEG that is adding this matrix_coefficients_Original line? Has there been any progress on adding a BT.2020 pipeline yet?
For now I’m going to stay with 4.0.4. as it produces that output that I need. Perhaps I just need to pass and x265 option, but I haven’t gone down that rabbit hole yet.
