Top ~20 pixels on mpv aren't 100% opaque

[ThibaultNocchi]

Platform

Ubuntu 20.10 amd64

GPU, drivers, and screen setup

name of display: :0
display: :0  screen: 0
direct rendering: Yes
Extended renderer info (GLX_MESA_query_renderer):
    Vendor: Intel (0x8086)
    Device: Mesa Intel(R) UHD Graphics 620 (KBL GT2) (0x5917)
    Version: 20.2.1
    Accelerated: yes
    Video memory: 3072MB
    Unified memory: yes
    Preferred profile: core (0x1)
    Max core profile version: 4.6
    Max compat profile version: 4.6
    Max GLES1 profile version: 1.1
    Max GLES[23] profile version: 3.2
OpenGL vendor string: Intel
OpenGL renderer string: Mesa Intel(R) UHD Graphics 620 (KBL GT2)
OpenGL core profile version string: 4.6 (Core Profile) Mesa 20.2.1
OpenGL core profile shading language version string: 4.60
OpenGL core profile context flags: (none)
OpenGL core profile profile mask: core profile

OpenGL version string: 4.6 (Compatibility Profile) Mesa 20.2.1
OpenGL shading language version string: 4.60
OpenGL context flags: (none)
OpenGL profile mask: compatibility profile

OpenGL ES profile version string: OpenGL ES 3.2 Mesa 20.2.1
OpenGL ES profile shading language version string: OpenGL ES GLSL ES 3.20

Environment

I'm using basic i3 v4.19.

picom version

vgit-bb54d (latest next at time of issue creation)

Configuration:

shadow = true;

shadow-radius = 7;

shadow-offset-x = -7;

shadow-offset-y = -7;

shadow-exclude = [
  "name = 'Notification'",
  "class_g = 'Conky'",
  "class_g ?= 'Notify-osd'",
  "class_g = 'Cairo-clock'",
  "_GTK_FRAME_EXTENTS@:c"
];

fading = true;
fade-in-step = 0.02;
fade-out-step = 0.03;
fade-delta = 7

inactive-opacity = 0.85;
frame-opacity = 0.7;
inactive-opacity-override = false;
focus-exclude = [ "class_g = 'Cairo-clock'" ];
opacity-rule = [
	"100:_NET_WM_STATE@:32a = '_NET_WM_STATE_FULLSCREEN'",
	"60:class_g = 'URxvt' && !focused",
	"100:class_g = 'zoom' && !focused",
	"100:class_g = 'mpv' && !focused"
];

blur-strength = 3;
blur-background = true;
blur-kern = "3x3box";
blur-background-exclude = [
	"class_g = 'slop'",
	"window_type = 'dock'",
	"window_type = 'desktop'",
	"_GTK_FRAME_EXTENTS@:c",
	"window_type = 'menu'",
	"window_type = 'toolbar'",
	"window_type = 'dropdown_menu'",
	"window_type = 'popup_menu'",
	"window_type = 'utility'"
];

backend = "glx";
vsync = true;
mark-wmwin-focused = true;
mark-ovredir-focused = true;
detect-rounded-corners = true;
detect-client-opacity = true;
refresh-rate = 0;
detect-transient = true;
detect-client-leader = true;
use-damage = true;
log-level = "warn";

wintypes:
{
  tooltip = { shadow = false; };
  dock = { shadow = false; }
  dnd = { shadow = false; }
  popup_menu = { opacity = 1; shadow = false; }
  dropdown_menu = { opacity = 1; shadow = false; }
  utility = { opacity = 1; shadow = false; }
};

Steps of reproduction

1. Open mpv, either with a video or the idle desktop view.

Expected behavior

Having a full opaque window.

Current Behavior

The top of the window isn't opaque.

Stack trace

Other details

[tryone144]

The window should be rendered correctly when frame-opacity = 1; is set.
Please check if xprop _NET_FRAME_EXTENTS outputs something along the lines of _NET_FRAME_EXTENTS(CARDINAL) = 2, 2, 20, 2 for that window. If so, this is a duplicate of #547.

[ThibaultNocchi]

Thanks, it worked! Here is the output nonetheless:
_NET_FRAME_EXTENTS(CARDINAL) = 0, 0, 18, 0
What does it mean?

Thanks a lot for being so quick, and sorry for putting a duplicate!

[tryone144]

What does it mean?

The _NET_WM_FRAME_EXTENTS property is used by a window manager to indicate the size of the window's borders in pixels. I am not quite sure why mpv sets these by themselves as i3 doesn't care to add them.

[ThibaultNocchi]

Ok, it's clear, thanks for your help, have a nice day!