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Bug#1027452: libmutter-11-0: ffmpeg kmsgrab stopped working after update from 43.2-2 to 43.2-4

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  Bug#1027452: libmutter-11-0: ffmpeg kmsgrab stopped working after update from 43.2-2 to 43.2-4 Alexandr Podgorniy <scaled@scaledteam.ru> - 2022-12-31 20:00 +0100
    Bug#1027452: libmutter-11-0: ffmpeg kmsgrab stopped working after update from 43.2-2 to 43.2-4 Alexandr Podgorniy <scaled@scaledteam.ru> - 2023-01-01 10:20 +0100
    Bug#1027452: libmutter-11-0: ffmpeg kmsgrab stopped working after update from 43.2-2 to 43.2-4 Alexandr Podgorniy <scaled@scaledteam.ru> - 2023-01-02 14:40 +0100

#1130978 — Bug#1027452: libmutter-11-0: ffmpeg kmsgrab stopped working after update from 43.2-2 to 43.2-4

Package: libmutter-11-0
Version: 43.2-4
Severity: normal
X-Debbugs-Cc: scaled@scaledteam.ru

Dear Maintainer, i used to capture my screen with ffmpeg kmsgrab feature, it
really simple and very effective. But after update from 43.2-2 to 43.2-4 it
captures very distorted images. My own programs for capturing based in same
principle stopped working too, for example, my fork of OBS Studio with this
feature. (https://github.com/scaledteam/obs-studio)

It appears in Gnome Wayland, but Gnome X11 works fine.

To test this, run this command:
sudo ffmpeg -framerate 30  -device /dev/dri/card0 -f kmsgrab -i - -vf
'hwmap=derive_device=vaapi,scale_vaapi=format=nv12' -c:v h264_vaapi output.mp4

This is zero-copy capture, which means very low CPU load and ability to capture
giant resolutions with almost 0% cpu usage.


-- System Information:
Debian Release: bookworm/sid
  APT prefers testing
  APT policy: (500, 'testing'), (50, 'unstable'), (1, 'experimental')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 6.1.0-0-amd64 (SMP w/16 CPU threads; PREEMPT)
Kernel taint flags: TAINT_PROPRIETARY_MODULE, TAINT_CPU_OUT_OF_SPEC, TAINT_OOT_MODULE, TAINT_UNSIGNED_MODULE
Locale: LANG=ru_RU.UTF-8, LC_CTYPE=ru_RU.UTF-8 (charmap=UTF-8), LANGUAGE not set
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages libmutter-11-0 depends on:
ii  adwaita-icon-theme         43-1
ii  gsettings-desktop-schemas  43.0-1
ii  libatk1.0-0                2.46.0-4
ii  libc6                      2.36-7
ii  libcairo-gobject2          1.16.0-7
ii  libcairo2                  1.16.0-7
ii  libcanberra0               0.30-10
ii  libcolord2                 1.4.6-2.1
ii  libdrm2                    2.4.114-1
ii  libegl1                    1.5.0-1
ii  libfontconfig1             2.13.1-4.5
ii  libfribidi0                1.0.8-2.1
ii  libgbm1                    22.2.4-1
ii  libgdk-pixbuf-2.0-0        2.42.10+dfsg-1
ii  libgl1                     1.5.0-1
ii  libglib2.0-0               2.74.4-1
ii  libgnome-desktop-3-20      43-2
ii  libgraphene-1.0-0          1.10.8-1
ii  libgtk-3-0                 3.24.35-3
ii  libgudev-1.0-0             237-2
ii  libice6                    2:1.0.10-1
ii  libinput10                 1.22.0-1
ii  libjson-glib-1.0-0         1.6.6-1
ii  liblcms2-2                 2.13.1-1+b1
ii  libpango-1.0-0             1.50.10+ds-1
ii  libpangocairo-1.0-0        1.50.10+ds-1
ii  libpangoft2-1.0-0          1.50.10+ds-1
ii  libpipewire-0.3-0          0.3.63-1
ii  libsm6                     2:1.2.3-1
ii  libstartup-notification0   0.12-6+b1
ii  libsystemd0                252.4-1
ii  libudev1                   252.4-1
ii  libwacom9                  2.5.0-1
ii  libwayland-server0         1.21.0-1
ii  libx11-6                   2:1.8.3-3
ii  libx11-xcb1                2:1.8.3-3
ii  libxau6                    1:1.0.9-1
ii  libxcb-randr0              1.15-1
ii  libxcb-res0                1.15-1
ii  libxcb1                    1.15-1
ii  libxcomposite1             1:0.4.5-1
ii  libxcursor1                1:1.2.1-1
ii  libxdamage1                1:1.1.5-2
ii  libxext6                   2:1.3.4-1+b1
ii  libxfixes3                 1:6.0.0-2
ii  libxi6                     2:1.8-1+b1
ii  libxinerama1               2:1.1.4-3
ii  libxkbcommon-x11-0         1.4.1-1
ii  libxkbcommon0              1.4.1-1
ii  libxkbfile1                1:1.1.0-1
ii  libxrandr2                 2:1.5.2-2+b1
ii  libxtst6                   2:1.2.3-1.1
ii  mutter-common              43.2-4

libmutter-11-0 recommends no packages.

libmutter-11-0 suggests no packages.

Versions of packages libmutter-11-0 is related to:
ii  libegl-mesa0 [libegl-vendor]  22.2.4-1
ii  libgl1-mesa-dri               22.2.4-1
ii  libglx-mesa0 [libglx-vendor]  22.2.4-1

-- no debconf information

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#1131009

Sorry, i did more testing and turns out, downgrading to 43.2-2 doesn't 
help =((( I compiled it from salsa and it still doesn't work. I just 
can't figure out what caused this problem, because other packages that i 
upgraded recently is not related to graphics.

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#1131267

I figured out the problem. Mutter on wayland uses multiplane 
framebuffer, and it's not compatible with old capture method. It's not 
very hard to implement in software that uses kmsgrab, so it's not mutter 
problem, it's ffmpeg problem. Please close this bug, and sorry for 
bothering.

P.S. I successfully implemented multiplane buffer support it in my 
software, so i hope ffmpeg will get similar fuctionality eventually.

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