There is visible banding in dark scenes when using the 8bit x265 encoder at mid-range CQ and encoder preset levels. For example I'm encoding blade runner blu-ray, an 8bit source, at CQ18 using the fast encoder preset. Banding can be quite visible in some scenes.
This is a screenshot of the encoded version using x265 codec, CQ18 Fast preset, same as source frame rate, everything else set on auto or none. Note that I am not using any filters when doing the encode. The banding is most prevalent on the right side of the picture:
Just so you can see it properly here I jacked the brightness up on the screenshots, but I know that how visible it is will obviously vary depending on monitor or tv brightness. On my TV I can see the banding easily in the conditions I usually watch films in and my TV has been calibrated properly.
For reference, this is a screenshot of the source (also with brightness jacked up):
The banding gets slightly better the slower the encoder preset used at CQ18, but is still present even on very slow at CQ18. The only way I've found to eliminate banding entirely (or at least reduce it to the point where it's barely visible) regardless of the encoder preset used is to either have the CQ at a very low level (such as , or use the average bitrate option instead and have it jacked up to 10,000 or more. This of course results in a much bigger file size which is not ideal for my circumstances.
The other alternative however is to use the x265 10bit codec. Using the exact same settings (CQ18, Fast encoder preset etc) I used with the 8bit codec, I get no discernible banding.
Here's a screenshot from the 10bit encode (again with the screenshot edited to have increased brightness):
I mean, normally I'd just use the 10bit encoder as a result but the source is of course an 8bit blu-ray, so my post here mostly stems from the fact I don't understand why using the 10bit codec is making any difference, unless something is wrong with the 8bit codec. The only other thing is I also did the same encode with the x265 NVenc codec and the banding exists on that too so I'm not entirely sure what's going on here, or why the 10bit codec handles 8bit sources better than the 8bit codec? I wonder if there's an advanced option the 10bit codec uses by default that would reduce or remove banding if used with the 8bit codec?
Steps to reproduce the problem (If Applicable):
Encode an 8bit video source that has dark scenes I guess, using the 8bit x265 codec at CQ18 and Fast (or whatever) encoder preset. You can leave everything else on default.
HandBrake version (e.g., 1.0.0):
1.3.3
Operating system and version (e.g., Ubuntu 16.04 LTS, macOS 10.13 High Sierra, Windows 10 Creators Update):
Windows 10 Pro May Update v2004
HandBrake Activity Log ***required*** (see How-to get an activity log)
Code: Select all
HandBrake 1.3.3 (2020062100)
OS: Microsoft Windows NT 10.0.19041.0
CPU: AMD FX-8370 Eight-Core Processor
Ram: 16276 MB,
GPU Information:
NVIDIA GeForce GTX 1080 - 26.21.14.4614
Screen: 1920x1080
Temp Dir: C:\Users\Skirmish\AppData\Local\Temp\
Install Dir: C:\Program Files\HandBrake
Data Dir: C:\Users\Skirmish\AppData\Roaming\HandBrake
-------------------------------------------
# Starting Encode ...
[12:14:38] base preset: Custom
[12:14:38] hb_init: starting libhb thread
[12:14:38] Starting work at: Sun Jun 21 12:14:38 2020
[12:14:38] 1 job(s) to process
[12:14:38] json job:
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{
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{
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[12:14:38] CPU:
[12:14:38] - logical processor count: 8
[12:14:38] Intel Quick Sync Video support: no
[12:14:38] hb_scan: path=D:\Backup\bladerunner.mkv, title_index=1
udfread ERROR: ECMA 167 Volume Recognition failed
src/libbluray/disc/disc.c:323: failed opening UDF image D:\Backup\bladerunner.mkv
src/libbluray/disc/disc.c:424: error opening file BDMV\index.bdmv
src/libbluray/disc/disc.c:424: error opening file BDMV\BACKUP\index.bdmv
src/libbluray/bluray.c:2585: nav_get_title_list(D:\Backup\bladerunner.mkv\) failed
[12:14:38] bd: not a bd - trying as a stream/file instead
libdvdnav: Using dvdnav version 6.0.1
libdvdread: Encrypted DVD support unavailable.
libdvdread:DVDOpenFileUDF:UDFFindFile /VIDEO_TS/VIDEO_TS.IFO failed
libdvdread:DVDOpenFileUDF:UDFFindFile /VIDEO_TS/VIDEO_TS.BUP failed
libdvdread: Can't open file VIDEO_TS.IFO.
libdvdnav: vm: failed to read VIDEO_TS.IFO
[12:14:38] dvd: not a dvd - trying as a stream/file instead
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NUMBER_OF_FRAMES-eng: 1606
NUMBER_OF_BYTES-eng: 12510710
SOURCE_ID-eng : 00120B
_STATISTICS_WRITING_APP-eng: MakeMKV v1.15.1 win(x64-release)
_STATISTICS_WRITING_DATE_UTC-eng: 2020-06-21 08:48:01
_STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES SOURCE_ID
Stream #0:23(por): Subtitle: hdmv_pgs_subtitle
Metadata:
BPS-eng : 15273
DURATION-eng : 01:56:31.505354166
NUMBER_OF_FRAMES-eng: 1638
NUMBER_OF_BYTES-eng: 13348495
SOURCE_ID-eng : 00120C
_STATISTICS_WRITING_APP-eng: MakeMKV v1.15.1 win(x64-release)
_STATISTICS_WRITING_DATE_UTC-eng: 2020-06-21 08:48:01
_STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES SOURCE_ID
Stream #0:24(swe): Subtitle: hdmv_pgs_subtitle
Metadata:
BPS-eng : 14514
DURATION-eng : 01:55:09.381645833
NUMBER_OF_FRAMES-eng: 1508
NUMBER_OF_BYTES-eng: 12535421
SOURCE_ID-eng : 00120D
_STATISTICS_WRITING_APP-eng: MakeMKV v1.15.1 win(x64-release)
_STATISTICS_WRITING_DATE_UTC-eng: 2020-06-21 08:48:01
_STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES SOURCE_ID
[12:14:38] scan: decoding previews for title 1
[12:14:38] scan: audio 0x1: truehd, rate=48000Hz, bitrate=1 English (TrueHD) (5.1 ch)
[12:14:38] scan: audio 0x2: ac3, rate=48000Hz, bitrate=640000 English (AC3) (5.1 ch) (640 kbps)
[12:14:38] scan: audio 0x3: ac3, rate=48000Hz, bitrate=640000 English (AC3) (5.1 ch) (640 kbps)
[12:14:38] scan: audio 0x4: ac3, rate=48000Hz, bitrate=640000 Francais (AC3) (5.1 ch) (640 kbps)
[12:14:38] scan: audio 0x5: ac3, rate=48000Hz, bitrate=640000 Deutsch (AC3) (5.1 ch) (640 kbps)
[12:14:38] scan: audio 0x6: ac3, rate=48000Hz, bitrate=640000 italiano (AC3) (5.1 ch) (640 kbps)
[12:14:38] scan: audio 0x7: ac3, rate=48000Hz, bitrate=640000 español (AC3) (5.1 ch) (640 kbps)
[12:14:38] scan: audio 0x8: ac3, rate=48000Hz, bitrate=192000 English (AC3) (2.0 ch) (192 kbps)
[12:14:38] scan: audio 0x9: ac3, rate=48000Hz, bitrate=192000 English (AC3) (2.0 ch) (192 kbps)
[12:14:38] scan: audio 0xa: ac3, rate=48000Hz, bitrate=192000 English (AC3) (2.0 ch) (192 kbps)
[12:14:39] scan: 10 previews, 1920x1080, 23.976 fps, autocrop = 144/136/0/0, aspect 16:9, PAR 1:1
[12:14:39] libhb: scan thread found 1 valid title(s)
[12:14:39] Starting Task: Encoding Pass
[12:14:39] Skipping crop/scale filter
[12:14:39] job configuration:
[12:14:39] * source
[12:14:39] + D:\Backup\bladerunner.mkv
[12:14:39] + title 1, start 00:20:1.00 stop 00:20:11.00
[12:14:39] + container: matroska,webm
[12:14:39] + data rate: 25296 kbps
[12:14:39] * destination
[12:14:39] + D:\bladerunner-8bit.mp4
[12:14:39] + container: MPEG-4 (libavformat)
[12:14:39] + align initial A/V stream timestamps
[12:14:39] + chapter markers
[12:14:39] * video track
[12:14:39] + decoder: vc1
[12:14:39] + filter
[12:14:39] + Framerate Shaper (mode=1)
[12:14:39] + frame rate: 23.976 fps -> constant 23.976 fps
[12:14:39] + Output geometry
[12:14:39] + storage dimensions: 1920 x 1080
[12:14:39] + pixel aspect ratio: 1 : 1
[12:14:39] + display dimensions: 1920 x 1080
[12:14:39] + encoder: H.265 (libx265)
[12:14:39] + preset: fast
[12:14:39] + profile: auto
[12:14:39] + level: auto
[12:14:39] + quality: 18.00 (RF)
[12:14:39] + color profile: 1-1-1
[12:14:39] * audio track 1
[12:14:39] + name: Surround 5.1
[12:14:39] + decoder: English (TrueHD) (5.1 ch) (track 1, id 0x1)
[12:14:39] + samplerate: 48000 Hz
[12:14:39] + mixdown: 5.1 Channels
[12:14:39] + dither: none
[12:14:39] + encoder: AAC (libavcodec)
[12:14:39] + quality: 10.00, samplerate: 48000 Hz
[12:14:39] sync: expecting 263 video frames
x265 [info]: HEVC encoder version 3.2.1+1-b5c86a64bbbe
x265 [info]: build info [Windows][GCC 9.2.0][64 bit] 8bit+10bit+12bit
x265 [info]: using cpu capabilities: MMX2 SSE2Fast LZCNT SSSE3 SSE4.2 AVX XOP FMA4 FMA3 BMI1
x265 [info]: Main profile, Level-4 (Main tier)
x265 [info]: Thread pool created using 8 threads
x265 [info]: Slices : 1
x265 [info]: frame threads / pool features : 3 / wpp(17 rows)
x265 [info]: Coding QT: max CU size, min CU size : 64 / 8
x265 [info]: Residual QT: max TU size, max depth : 32 / 1 inter / 1 intra
x265 [info]: ME / range / subpel / merge : hex / 57 / 2 / 2
x265 [info]: Keyframe min / max / scenecut / bias: 24 / 240 / 40 / 5.00
x265 [info]: Lookahead / bframes / badapt : 15 / 4 / 0
x265 [info]: b-pyramid / weightp / weightb : 1 / 1 / 0
x265 [info]: References / ref-limit cu / depth : 3 / on / on
x265 [info]: AQ: mode / str / qg-size / cu-tree : 2 / 1.0 / 32 / 1
x265 [info]: Rate Control / qCompress : CRF-18.0 / 0.60
x265 [info]: tools: rd=2 psy-rd=2.00 rskip signhide tmvp fast-intra
x265 [info]: tools: strong-intra-smoothing lslices=6 deblock sao
[12:14:39] sync: first pts audio 0x1 is 0
[12:14:40] sync: "Chapter 7" (7) at frame 1 time -5400
[12:14:40] sync: first pts video is 2107
[12:14:48] sync: reached audio 0x1 pts 900000, exiting early
[12:14:51] sync: reached video pts 903007, exiting early
[12:14:53] work: average encoding speed for job is 21.974831 fps
[12:14:53] vfr: 240 frames output, 0 dropped and 0 duped for CFR/PFR
[12:14:53] vfr: lost time: 0 (0 frames)
[12:14:53] vfr: gained time: 0 (0 frames) (0 not accounted for)
[12:14:53] truehd-decoder done: 20398 frames, 0 decoder errors
[12:14:53] vc1-decoder done: 392 frames, 0 decoder errors
[12:14:53] sync: got 242 frames, 263 expected
[12:14:53] sync: framerate min 23.976 fps, max 23.976 fps, avg 24.176 fps
x265 [info]: frame I: 4, Avg QP:18.14 kb/s: 15900.28
x265 [info]: frame P: 48, Avg QP:19.79 kb/s: 7121.22
x265 [info]: frame B: 188, Avg QP:23.12 kb/s: 1939.08
x265 [info]: Weighted P-Frames: Y:0.0% UV:0.0%
x265 [info]: consecutive B-frames: 7.7% 0.0% 1.9% 3.8% 86.5%
encoded 240 frames in 13.94s (17.22 fps), 3208.19 kb/s, Avg QP:22.37
[12:14:53] mux: track 0, 240 frames, 4015213 bytes, 3195.65 kbps, fifo 256
[12:14:53] mux: track 1, 469 frames, 1005471 bytes, 800.24 kbps, fifo 512
[12:14:53] Finished work at: Sun Jun 21 12:14:53 2020
[12:14:53] libhb: work result = 0
# Encode Completed ...