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Issue metadata

Status: Assigned
Owner:
Cc:
Components:
EstimatedDays: ----
NextAction: ----
OS: Windows
Pri: 3
Type: Bug

Blocked on:
issue 902550


Participants' hotlists:
win7-broken-color


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Full range (PC range)'s color is clipped when using hardware-accelerated video decode

Reported by human.p...@gmail.com, Jun 9 2018

Issue description

UserAgent: Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/69.0.3453.0 Safari/537.36

Example URL:
https://files.catbox.moe/o5a8jg.mp4

Steps to reproduce the problem:
1. Make sure chrome://flags/#disable-accelerated-video-decode is enabled 
1. Open the video (also attached as attachment).

What is the expected behavior?
The color should be represented as RGB value that the red fonts show.

What went wrong?
Color is clipped, 16,16,16 became 0,0,0 etc.

Did this work before? N/A 

Is it a problem with Flash or HTML5? HTML5

Does this work in other browsers? N/A

Chrome version: 69.0.3453.0  Channel: canary
OS Version: 6.1 (Windows 7, Windows Server 2008 R2)
Flash Version: 

Contents of chrome://gpu: 

Graphics Feature Status
Canvas: Hardware accelerated
Flash: Hardware accelerated
Flash Stage3D: Hardware accelerated
Flash Stage3D Baseline profile: Hardware accelerated
Compositing: Hardware accelerated
Multiple Raster Threads: Enabled
Native GpuMemoryBuffers: Software only. Hardware acceleration disabled
Out-of-process Rasterization: Disabled
Hardware Protected Video Decode: Unavailable
Rasterization: Hardware accelerated
Skia Deferred Display List: Disabled
Skia Renderer: Disabled
Surface Synchronization: Enabled
Video Decode: Hardware accelerated
Viz Service Display Compositor: Disabled
WebGL: Hardware accelerated
WebGL2: Hardware accelerated
Driver Bug Workarounds
clear_uniforms_before_first_program_use
decode_encode_srgb_for_generatemipmap
disable_accelerated_vpx_decode
disable_delayed_copy_nv12
disable_direct_composition
disable_discard_framebuffer
disable_dxgi_zero_copy_video
disable_framebuffer_cmaa
exit_on_context_lost
force_cube_complete
scalarize_vec_and_mat_constructor_args
texsubimage_faster_than_teximage
Problems Detected
Protected video decoding with swap chain is for Windows and Intel only
Disabled Features: protected_video_decode
Some drivers are unable to reset the D3D device in the GPU process sandbox
Applied Workarounds: exit_on_context_lost
TexSubImage is faster for full uploads on ANGLE
Applied Workarounds: texsubimage_faster_than_teximage
Clear uniforms before first program use on all platforms: 124764, 349137
Applied Workarounds: clear_uniforms_before_first_program_use
Always rewrite vec/mat constructors to be consistent: 398694
Applied Workarounds: scalarize_vec_and_mat_constructor_args
ANGLE crash on glReadPixels from incomplete cube map texture: 518889
Applied Workarounds: force_cube_complete
Framebuffer discarding can hurt performance on non-tilers: 570897
Applied Workarounds: disable_discard_framebuffer
Direct composition flashes black initially on Win <10: 588588
Applied Workarounds: disable_direct_composition
Zero copy DXGI video hangs on shutdown on Win < 8.1: 621190
Applied Workarounds: disable_dxgi_zero_copy_video
Use GL_INTEL_framebuffer_CMAA on ChromeOS: 535198
Applied Workarounds: disable_framebuffer_cmaa
Disable KHR_blend_equation_advanced until cc shaders are updated: 661715
Applied Workarounds: disable(GL_KHR_blend_equation_advanced), disable(GL_KHR_blend_equation_advanced_coherent)
Decode and Encode before generateMipmap for srgb format textures on Windows: 634519
Applied Workarounds: decode_encode_srgb_for_generatemipmap
VPx decoding isn't supported well before Windows 10 creators update.: 616318, 667532
Applied Workarounds: disable_accelerated_vpx_decode
Delayed copy NV12 displays incorrect colors on NVIDIA drivers.: 728670
Applied Workarounds: disable_delayed_copy_nv12
Don't expose disjoint_timer_query extensions to WebGL: 808744
Native GpuMemoryBuffers have been disabled, either via about:flags or command line.
Disabled Features: native_gpu_memory_buffers
Viz service display compositor is not enabled by default.
Disabled Features: viz_display_compositor
Skia renderer is not used by default.
Disabled Features: skia_renderer
Skia deferred display list is not used by default.
Disabled Features: skia_deferred_display_list
Version Information
Data exported	2018-06-09T03:12:11.490Z
Chrome version	Chrome/69.0.3453.0
Operating system	Windows NT 6.1.7601 SP1
Software rendering list URL	https://chromium.googlesource.com/chromium/src/+/67baaec3f00fba7d0a5b1041fca4e28b16ac5e55/gpu/config/software_rendering_list.json
Driver bug list URL	https://chromium.googlesource.com/chromium/src/+/67baaec3f00fba7d0a5b1041fca4e28b16ac5e55/gpu/config/gpu_driver_bug_list.json
ANGLE commit id	81970bc302dd
2D graphics backend	Skia/69 9f752aada37c9e1e10328721ea0b480553da50d5-
Command Line	"C:\Users\Administrator\AppData\Local\Google\Chrome SxS\Application\chrome.exe" --flag-switches-begin --flag-switches-end
Driver Information
Initialization time	43
In-process GPU	false
Passthrough Command Decoder	true
Direct Composition	false
Supports overlays	false
Sandboxed	true
GPU0	VENDOR = 0x10de, DEVICE= 0x11c0 *ACTIVE*
GPU1	VENDOR = 0x8086, DEVICE= 0x0412
Optimus	false
AMD switchable	false
Desktop compositing	Aero Glass
Diagonal Monitor Size of \\.\DISPLAY1	23.0"
Driver D3D12 feature level	Not supported
Driver Vulkan API version	Vulkan API 1.1.0
Driver vendor	NVIDIA
Driver version	24.21.13.9764
Driver date	5-7-2018
Pixel shader version	5.0
Vertex shader version	5.0
Max. MSAA samples	8
Machine model name	
Machine model version	
GL_VENDOR	Google Inc.
GL_RENDERER	ANGLE (NVIDIA GeForce GTX 660 Direct3D11 vs_5_0 ps_5_0)
GL_VERSION	OpenGL ES 2.0 (ANGLE 2.1.0.81970bc302dd)
GL_EXTENSIONS	GL_ANGLE_client_arrays GL_ANGLE_depth_texture GL_ANGLE_explicit_context GL_ANGLE_explicit_context_gles1 GL_ANGLE_framebuffer_blit GL_ANGLE_framebuffer_multisample GL_ANGLE_instanced_arrays GL_ANGLE_lossy_etc_decode GL_ANGLE_pack_reverse_row_order GL_ANGLE_program_cache_control GL_ANGLE_request_extension GL_ANGLE_robust_client_memory GL_ANGLE_texture_compression_dxt3 GL_ANGLE_texture_compression_dxt5 GL_ANGLE_texture_usage GL_ANGLE_translated_shader_source GL_CHROMIUM_bind_generates_resource GL_CHROMIUM_bind_uniform_location GL_CHROMIUM_color_buffer_float_rgb GL_CHROMIUM_color_buffer_float_rgba GL_CHROMIUM_copy_compressed_texture GL_CHROMIUM_copy_texture GL_CHROMIUM_sync_query GL_EXT_blend_minmax GL_EXT_color_buffer_half_float GL_EXT_debug_marker GL_EXT_discard_framebuffer GL_EXT_disjoint_timer_query GL_EXT_draw_buffers GL_EXT_frag_depth GL_EXT_map_buffer_range GL_EXT_occlusion_query_boolean GL_EXT_read_format_bgra GL_EXT_robustness GL_EXT_sRGB GL_EXT_shader_texture_lod GL_EXT_texture_compression_dxt1 GL_EXT_texture_compression_s3tc_srgb GL_EXT_texture_filter_anisotropic GL_EXT_texture_format_BGRA8888 GL_EXT_texture_rg GL_EXT_texture_storage GL_EXT_unpack_subimage GL_KHR_debug GL_NV_EGL_stream_consumer_external GL_NV_fence GL_NV_pack_subimage GL_NV_pixel_buffer_object GL_OES_EGL_image GL_OES_EGL_image_external GL_OES_compressed_ETC1_RGB8_texture GL_OES_depth32 GL_OES_element_index_uint GL_OES_get_program_binary GL_OES_mapbuffer GL_OES_packed_depth_stencil GL_OES_rgb8_rgba8 GL_OES_standard_derivatives GL_OES_surfaceless_context GL_OES_texture_float GL_OES_texture_float_linear GL_OES_texture_half_float GL_OES_texture_half_float_linear GL_OES_texture_npot GL_OES_vertex_array_object OES_compressed_EAC_R11_signed_texture OES_compressed_EAC_R11_unsigned_texture OES_compressed_EAC_RG11_signed_texture OES_compressed_EAC_RG11_unsigned_texture OES_compressed_ETC2_RGB8_texture OES_compressed_ETC2_RGBA8_texture OES_compressed_ETC2_punchthroughA_RGBA8_texture OES_compressed_ETC2_punchthroughA_sRGB8_alpha_texture OES_compressed_ETC2_sRGB8_alpha8_texture OES_compressed_ETC2_sRGB8_texture
Disabled Extensions	GL_KHR_blend_equation_advanced GL_KHR_blend_equation_advanced_coherent
Disabled WebGL Extensions	EXT_disjoint_timer_query EXT_disjoint_timer_query_webgl2
Window system binding vendor	Google Inc. (adapter LUID: 000000000000b26f)
Window system binding version	1.4 (ANGLE 2.1.0.81970bc302dd)
Window system binding extensions	EGL_EXT_create_context_robustness EGL_ANGLE_d3d_share_handle_client_buffer EGL_ANGLE_d3d_texture_client_buffer EGL_ANGLE_surface_d3d_texture_2d_share_handle EGL_ANGLE_query_surface_pointer EGL_ANGLE_window_fixed_size EGL_ANGLE_keyed_mutex EGL_ANGLE_surface_orientation EGL_NV_post_sub_buffer EGL_KHR_create_context EGL_EXT_device_query EGL_KHR_image EGL_KHR_image_base EGL_KHR_gl_texture_2D_image EGL_KHR_gl_texture_cubemap_image EGL_KHR_gl_renderbuffer_image EGL_KHR_get_all_proc_addresses EGL_KHR_stream EGL_KHR_stream_consumer_gltexture EGL_NV_stream_consumer_gltexture_yuv EGL_ANGLE_flexible_surface_compatibility EGL_ANGLE_stream_producer_d3d_texture EGL_ANGLE_create_context_webgl_compatibility EGL_CHROMIUM_create_context_bind_generates_resource EGL_EXT_pixel_format_float EGL_KHR_surfaceless_context EGL_ANGLE_display_texture_share_group EGL_ANGLE_create_context_client_arrays EGL_ANGLE_program_cache_control EGL_ANGLE_robust_resource_initialization EGL_ANGLE_create_context_extensions_enabled
Direct rendering	Yes
Reset notification strategy	0x8252
GPU process crash count	0
Compositor Information
Tile Update Mode	One-copy
Partial Raster	Enabled
GpuMemoryBuffers Status
ATC	Software only
ATCIA	Software only
DXT1	Software only
DXT5	Software only
ETC1	Software only
R_8	Software only
R_16	Software only
RG_88	Software only
BGR_565	Software only
RGBA_4444	Software only
RGBX_8888	GPU_READ, SCANOUT
RGBA_8888	GPU_READ, SCANOUT
BGRX_8888	Software only
BGRX_1010102	Software only
RGBX_1010102	Software only
BGRA_8888	Software only
RGBA_F16	Software only
YVU_420	Software only
YUV_420_BIPLANAR	Software only
UYVY_422	Software only
Display(s) Information
Info	Display[2528732444] bounds=[0,0 1920x1080], workarea=[0,0 1920x1040], scale=1, external.
Color space information	{primaries:BT709, transfer:IEC61966_2_1, matrix:RGB, range:FULL}
Bits per color component	8
Bits per pixel	24
Video Acceleration Information
Decode h264 baseline	up to 1920x1088 pixels
Decode h264 main	up to 1920x1088 pixels
Decode h264 high	up to 1920x1088 pixels
Diagnostics
0
b3DAccelerationEnabled	true
b3DAccelerationExists	true
bAGPEnabled	true
bAGPExistenceValid	true
bAGPExists	true
bCanRenderWindow	true
bDDAccelerationEnabled	true
bDriverBeta	false
bDriverDebug	false
bDriverSigned	false
bDriverSignedValid	false
bNoHardware	false
dwBpp	32
dwDDIVersion	11
dwHeight	1080
dwRefreshRate	60
dwWHQLLevel	0
dwWidth	1920
iAdapter	0
lDriverSize	19009672
lMiniVddSize	0
szAGPStatusEnglish	Enabled
szAGPStatusLocalized	已启用
szChipType	GeForce GTX 660
szD3DStatusEnglish	Enabled
szD3DStatusLocalized	已启用
szDACType	Integrated RAMDAC
szDDIVersionEnglish	11
szDDIVersionLocalized	11
szDDStatusEnglish	Enabled
szDDStatusLocalized	已启用
szDXVAHDEnglish	Supported
szDXVAModes	
szDescription	NVIDIA GeForce GTX 660
szDeviceId	0x11C0
szDeviceIdentifier	{D7B71E3E-5280-11CF-CC51-43151BC2D535}
szDeviceName	\\.\DISPLAY1
szDisplayMemoryEnglish	1664 MB
szDisplayMemoryLocalized	1664 MB
szDisplayModeEnglish	1920 x 1080 (32 bit) (60Hz)
szDisplayModeLocalized	1920 x 1080 (32 bit) (60Hz)
szDriverAssemblyVersion	24.21.13.9764
szDriverAttributes	Final Retail
szDriverDateEnglish	5/8/2018 16:22:28
szDriverDateLocalized	2018/5/8 16:22:28
szDriverLanguageEnglish	English
szDriverLanguageLocalized	英语(美国)
szDriverModelEnglish	WDDM 1.1
szDriverModelLocalized	WDDM 1.1
szDriverName	nvd3dumx.dll,nvwgf2umx.dll,nvwgf2umx.dll,nvd3dum,nvwgf2um,nvwgf2um
szDriverNodeStrongName	oem9.inf:NVIDIA_Devices.NTamd64.6.1:Section007:24.21.13.9764:pci\ven_10de&dev_11c0
szDriverSignDate	
szDriverVersion	24.21.0013.9764
szKeyDeviceID	Enum\PCI\VEN_10DE&DEV_11C0&SUBSYS_354E1458&REV_A1
szKeyDeviceKey	\Registry\Machine\System\CurrentControlSet\Control\Video\{656A931D-A01E-4CEA-89EE-13DB7423063A}\0000
szManufacturer	NVIDIA
szMiniVdd	暂缺
szMiniVddDateEnglish	n/a
szMiniVddDateLocalized	暂缺
szMonitorMaxRes	
szMonitorName	通用即插即用监视器
szNotesEnglish	No problems found.
szNotesLocalized	没有发现问题。
szOverlayEnglish	Supported
szRankOfInstalledDriver	00E62001
szRegHelpText	
szRevision	
szRevisionId	0x00A1
szSubSysId	0x354E1458
szTestResultD3D7English	Not run
szTestResultD3D7Localized	未运行
szTestResultD3D8English	Not run
szTestResultD3D8Localized	未运行
szTestResultD3D9English	Not run
szTestResultD3D9Localized	未运行
szTestResultDDEnglish	Not run
szTestResultDDLocalized	未运行
szVdd	暂缺
szVendorId	0x10DE
Log Messages
GpuProcessHostUIShim: The GPU process exited normally. Everything is okay.
GpuProcessHostUIShim: The GPU process exited normally. Everything is okay.
GpuProcessHostUIShim: The GPU process exited normally. Everything is okay.

It works fine with software video decoding. 

I'm on Win 7 x64 with nVidia GPU.
 
out_420_709_full.mp4
202 KB View Download
Labels: Needs-Triage-M69
This bug is also on Android 8.1 (which I assume is hardware decoding).

Tested with Nexus 6P.
Le lun. 11 juin 2018 à 02:15, human.p… via monorail <
monorail+v2.338603342@chromium.org> a écrit :
Le lun. 11 juin 2018 à 02:33, Ammi Mohamed <ammimohamed1234@gmail.com> a
écrit :
Le lun. 11 juin 2018 à 02:32, Ammi Mohamed <ammimohamed1234@gmail.com> a
écrit :
Cc: hubbe@chromium.org
Components: -Internals>Media Internals>Media>Video
It seems to *work* on my laptop, which is Win10 + Intel GPU.

Chrome://gpu info: https://pastebin.com/cswmfdVs
Cc: -hubbe@chromium.org
Owner: hubbe@chromium.org
Status: Assigned (was: Unconfirmed)
First of all: This is supposed to work. (in fact it works on all machines I have tried it on so far.)

There is code in there that tells the video processor "this is full-range video" and then asks it to convert it to RGB. Not sure why that's not enough, and I don't have a windows 7 machine to try it on.

I will see if I can find a windows 7 machine to try it on though.

Thanks for looking into it. Do you by chance test on Android? As mentioned before, it didn't work there either. Granted, the Android version may have vastly different code base which is out of your field.
I can take a look at how it works on android, but as you point out, it's really a separate code path and a separate problem.

Actually, could you file a separate bug for the android problem?

Yeah, I filed it at bug 867977.


Cc: dalecur...@chromium.org
Labels: -Pri-2 Pri-3
Owner: ----
Status: Available (was: Assigned)
Just curious: are you quitting Chromium project? Saw you dropped basically all the assigned bugs. 

Anyway thanks for the help on video-related bugs all these years.
Blockedon: 902550
Cc: -dalecur...@chromium.org
Owner: dalecur...@chromium.org
Status: Assigned (was: Available)
Same as issue 902550, we should just disable for Windows 7.
@human.peng: Yes hubbe@ has moved on to another team. Can you see if the issue occurs with --disable-features=video-blit-color-accuracy ?
@dalecur...:

Yes, the bug went away when I enabled that switch.


buggone.png
177 KB View Download
@human.peng: Have you modified the NVIDIA control panel setting for full/limited range under "adjust video color settings" ?
Ah, good question. No, that setting is untouched ("with the video player settings").

So, If I use "--disable-features=video-blit-color-accuracy", it WILL mess up the color of limited range video :(

Comment 21 Deleted

Just to make it clear: what I reported as "working" in comment 18 is because:

disabling video-blit-color-accuracy will just re-introduce the previous bug ( issue 763224 ), which make *all* video's color washed-out (when that nV setting is set to auto instead of manual "full"). And that effect "cancels out" with the bug that full-color video's range is clipped, which makes it look normal.

So, yeah, the full-range video color clipping bug is still there.

(I think you definitely know better than me, just don't want to confuse anyone!)
Project Member

Comment 23 by bugdroid1@chromium.org, Dec 17

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/925f40e1f40b6ffb40cf152efa6d92b7af6fbae1

commit 925f40e1f40b6ffb40cf152efa6d92b7af6fbae1
Author: Sunny Sachanandani <sunnyps@chromium.org>
Date: Mon Dec 17 21:48:57 2018

Fix incorrect D3D11 color range configuration

Color range was being set incorrectly presumably due to a typo.

Bug: 851216, 825578, 902550
Change-Id: I22c1af549619c2fad194990a39f11ae7600ca684
Reviewed-on: https://chromium-review.googlesource.com/c/1379035
Reviewed-by: Kenneth Russell <kbr@chromium.org>
Reviewed-by: ccameron <ccameron@chromium.org>
Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Commit-Queue: Dale Curtis <dalecurtis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#617242}
[modify] https://crrev.com/925f40e1f40b6ffb40cf152efa6d92b7af6fbae1/ui/gfx/color_space_win.cc

The above change may fix the issues with washout. I'll let you know which Chrome Canary version gets that commit. Once available, please test if the issue is fixed there _without_ disabling video-blit-color-accuracy.
Sure, thank you.
Cc: susan.boorgula@chromium.org
Labels: Needs-Feedback
Tested this issue on Windows 7 on the reported version 69.0.3453.0 and the latest M-73 73.0.3644.0 by following the below steps.

1. Launched Chrome and made sure chrome://flags/#disable-accelerated-video-decode is enabled 
2. Navigated to https://files.catbox.moe/o5a8jg.mp4 and can observe the same behavior in the reported version and on the latest M-73 build
Attached is the screen cast for reference.

dalecurtis@ Request you to check and confirm if anything is missed from our end in verifying the issue and help us to verify the fix on the latest M-73 build.

Thanks...
851216.mp4
736 KB View Download
Thanks susan.

@human.peng: Can you double check as well with canary version 73.0.3644.0? Also let me know if things are no longer fixed with --disable-features=video-blit-color-accuracy
@dale: They're still broken on my end with the following version, when using no launch option.


Google Chrome	73.0.3644.0 (Official Build) canary (64-bit) (cohort: Clang-64)
Revision	fe72396229ba179b91d835591ff0cffb311d8076-refs/branch-heads/3644@{#1}
Thanks, but still fixed when using the option?
Well as mentioned before, it's hardly count as "fixed" because 

1) using that option will mess up limited range video instead;
2) If I use that option together with setting color range manually to "full" in nVidia settings, it does nothing (i.e. as broken as without that option)

But yes, if I use "--disable-features=video-blit-color-accuracy" and keep nVidia setting as "with the video player settings", it will show full-range (and full-range only) video correctly (which IMHO is just a coincidence of two bugs cancelling out).

Basically, the whole situation is no difference from what I observed a few days ago.
Project Member

Comment 31 by bugdroid1@chromium.org, Dec 20

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/a30440e4cfc7016d4f75a4e108025667e130b78b

commit a30440e4cfc7016d4f75a4e108025667e130b78b
Author: Dale Curtis <dalecurtis@chromium.org>
Date: Thu Dec 20 01:09:43 2018

Fix one more instance of incorrect color range.

Another incorrect usage of RGB_Range=1/LIMITED and 0-255 for the
nominal range.

This switches the code to use GetD3D11ColorSpace for consistency;
which may change some behaviors -- it sets matrix, rgb, and range
based on color_space instead of always using full range.

Per discussion with hubbe@ we're expecting this to make a direct
copy so it shouldn't affect anything, but that's an unverified
assumption.

BUG=851216, 825578, 902550
TEST=none
R=sunnyps

Change-Id: I55d192de607a26cb76238cc70a46f4343bb8f290
Reviewed-on: https://chromium-review.googlesource.com/c/1383325
Commit-Queue: Dale Curtis <dalecurtis@chromium.org>
Reviewed-by: Frank Liberato <liberato@chromium.org>
Reviewed-by: Sunny Sachanandani <sunnyps@chromium.org>
Cr-Commit-Position: refs/heads/master@{#618054}
[modify] https://crrev.com/a30440e4cfc7016d4f75a4e108025667e130b78b/media/gpu/windows/dxva_video_decode_accelerator_win.cc

I'm ooo until January, but let me know if that patch helps out!  Should be in Friday's canary version. Probably 73.0.3647.0 or higher.
Tested this issue on Windows 7 on the reported version 69.0.3453.0 and the latest M-73 73.0.3646.0 by following the below steps.

1. Launched Chrome and made sure chrome://flags/#disable-accelerated-video-decode is enabled 
2. Navigated to https://files.catbox.moe/o5a8jg.mp4 and can observe the same behavior in the reported version and on the latest M-73 build
Attached is the screen shots of the reported version and the latest M-73.

As dalecurtis@ is OOO till January, Requesting  human.peng@ to check and confirm if anything is missed from our end in verifying the issue and help us to verify the fix on the latest M-73 build.

Thanks...
851216-1-M73 (1).png
251 KB View Download
851216-M69 (1).png
194 KB View Download
@dale: unfortunately, it is still bugged.
Ah that's unfortunate. Can you test to see if the statements you made in c#22 are still true? I.e., that w/ --disable-features=video-blit-color-accuracy range isn't expanded correctly?
Yes, it is still true.

w/ --disable-features=video-blit-color-accuracy + auto in nV setting:

normal video: washed-out
full-range video: correct

w/ --disable-features=video-blit-color-accuracy + "full" in nV setting:

Normal video: Correct
Full-range video: clipped
Ahh that's unfortunate :/ Not sure where to go from here. Will have to give it some more thought.

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