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Qu’est ce qu’un éditorial
21 juin 2013, parEcrivez votre de point de vue dans un article. Celui-ci sera rangé dans une rubrique prévue à cet effet.
Un éditorial est un article de type texte uniquement. Il a pour objectif de ranger les points de vue dans une rubrique dédiée. Un seul éditorial est placé à la une en page d’accueil. Pour consulter les précédents, consultez la rubrique dédiée.
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Contribute to translation
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HTML5 audio and video support
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How to use web analytics to acquire new customers
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Supporting HEVC/H.265 videos in Electron
1er mars 2021, par ElmoChrome/Electron don't normally support H.265 videos. I want the user to be able to play .mov files recorded by Apple devices in my app. How can I do this ?


Possible approaches :


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- Use ffmpeg to transcode to H.264 in real-time, which will be resource intensive (not ideal)
- Use WebAssembly to render the video in a
<canvas></canvas>
tag (not ideal) - Fork and manually add H.265 codec support to Chrome/Electron (overkill)
- Use a native module that renders the video in a
<canvas></canvas>
orBrowserView










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Why X.Org's X Server has stopped working on Google Colab ?
20 février 2021, par RahulI am Using X server for the virtual screen on Google Colab and capturing that screen with ffmpeg to record it and live stream it to twitch. (for the reinforcement learning project)




The above process was completely working till my last use of my Colab notebook (on mid-January 2021), but now (on 19th February 2021) I am using the same notebook and the streaming code has stopped working.




I am adding config and log file data below. (I have never seen these files before because it was working, now it's not so I don't have any idea what wrong)


The config file stored at
/etc/X11/xorg.conf
have the following data :

# nvidia-xconfig: X configuration file generated by nvidia-xconfig
# nvidia-xconfig: version 418.67

Section "ServerLayout"
 Identifier "Layout0"
 Screen 0 "Screen0"
 InputDevice "Keyboard0" "CoreKeyboard"
 InputDevice "Mouse0" "CorePointer"
EndSection

Section "Files"
EndSection

Section "InputDevice"
 # generated from default
 Identifier "Mouse0"
 Driver "mouse"
 Option "Protocol" "auto"
 Option "Device" "/dev/mouse"
 Option "Emulate3Buttons" "no"
 Option "ZAxisMapping" "4 5"
EndSection

Section "InputDevice"
 # generated from default
 Identifier "Keyboard0"
 Driver "kbd"
EndSection

Section "Monitor"
 Identifier "Monitor0"
 VendorName "Unknown"
 ModelName "Unknown"
 HorizSync 28.0 - 33.0
 VertRefresh 43.0 - 72.0
 Option "DPMS"
EndSection

Section "Device"
 Identifier "Device0"
 Driver "nvidia"
 VendorName "NVIDIA Corporation"
 BoardName "Tesla T4"
 BusID "PCI:0:4:0"
 MatchSeat "seat-1"
EndSection

Section "Screen"
 Identifier "Screen0"
 Device "Device0"
 Monitor "Monitor0"
 DefaultDepth 24
 Option "AllowEmptyInitialConfiguration" "True"
 SubSection "Display"
 Virtual 1920 1080
 Depth 24
 EndSubSection
EndSection



The log file stored at
/var/log/Xorg.0.log
have the following data :

[ 464.605] 
X.Org X Server 1.19.6
Release Date: 2017-12-20
[ 464.605] X Protocol Version 11, Revision 0
[ 464.605] Build Operating System: Linux 4.15.0-124-generic x86_64 Ubuntu
[ 464.605] Current Operating System: Linux 9d3fe3949671 4.19.112+ #1 SMP Thu Jul 23 08:00:38 PDT 2020 x86_64
[ 464.605] Kernel command line: BOOT_IMAGE=/syslinux/vmlinuz.A init=/usr/lib/systemd/systemd boot=local rootwait ro noresume noswap loglevel=7 noinitrd console=ttyS0 security=apparmor virtio_net.napi_tx=1 systemd.unified_cgroup_hierarchy=false systemd.legacy_systemd_cgroup_controller=false csm.disabled=1 dm_verity.error_behavior=3 dm_verity.max_bios=-1 dm_verity.dev_wait=1 i915.modeset=1 cros_efi loadpin.enabled=0 root=/dev/dm-0 "dm=1 vroot none ro 1,0 4077568 verity payload=PARTUUID=555BDB75-CBD7-CD4A-B24E-29B13D7AC0DF hashtree=PARTUUID=555BDB75-CBD7-CD4A-B24E-29B13D7AC0DF hashstart=4077568 alg=sha256 root_hexdigest=42104d547ac104fb7061529e78f53e4f3e8c3d3cbb040dc6e0f84aad68491347 salt=9dc7f3acc4e2ce65be16356e960c2b21b51a917fa31d2e891fd295490c991e41" mitigations=off
[ 464.605] Build Date: 30 November 2020 08:01:56PM
[ 464.605] xorg-server 2:1.19.6-1ubuntu4.8 (For technical support please see http://www.ubuntu.com/support) 
[ 464.605] Current version of pixman: 0.34.0
[ 464.605] Before reporting problems, check http://wiki.x.org
 to make sure that you have the latest version.
[ 464.605] Markers: (--) probed, (**) from config file, (==) default setting,
 (++) from command line, (!!) notice, (II) informational,
 (WW) warning, (EE) error, (NI) not implemented, (??) unknown.
[ 464.605] (==) Log file: "/var/log/Xorg.0.log", Time: Sat Feb 20 03:10:44 2021
[ 464.606] (==) Using config file: "/etc/X11/xorg.conf"
[ 464.606] (==) Using system config directory "/usr/share/X11/xorg.conf.d"
[ 464.607] (==) ServerLayout "Layout0"
[ 464.607] (**) |-->Screen "Screen0" (0)
[ 464.607] (**) | |-->Monitor "Monitor0"
[ 464.607] (**) | |-->Device "Device0"
[ 464.607] (**) |-->Input Device "Keyboard0"
[ 464.607] (**) |-->Input Device "Mouse0"
[ 464.607] (==) Automatically adding devices
[ 464.607] (==) Automatically enabling devices
[ 464.607] (==) Automatically adding GPU devices
[ 464.607] (==) Automatically binding GPU devices
[ 464.607] (==) Max clients allowed: 256, resource mask: 0x1fffff
[ 464.607] (WW) The directory "/usr/share/fonts/X11/cyrillic" does not exist.
[ 464.607] Entry deleted from font path.
[ 464.607] (WW) The directory "/usr/share/fonts/X11/100dpi/" does not exist.
[ 464.607] Entry deleted from font path.
[ 464.607] (WW) The directory "/usr/share/fonts/X11/75dpi/" does not exist.
[ 464.607] Entry deleted from font path.
[ 464.607] (WW) The directory "/usr/share/fonts/X11/Type1" does not exist.
[ 464.607] Entry deleted from font path.
[ 464.607] (WW) The directory "/usr/share/fonts/X11/100dpi" does not exist.
[ 464.607] Entry deleted from font path.
[ 464.607] (WW) The directory "/usr/share/fonts/X11/75dpi" does not exist.
[ 464.607] Entry deleted from font path.
[ 464.607] (==) FontPath set to:
 /usr/share/fonts/X11/misc,
 built-ins
[ 464.607] (==) ModulePath set to "/usr/lib/xorg/modules"
[ 464.607] (WW) Hotplugging is on, devices using drivers 'kbd', 'mouse' or 'vmmouse' will be disabled.
[ 464.607] (WW) Disabling Keyboard0
[ 464.607] (WW) Disabling Mouse0
[ 464.607] (II) Loader magic: 0x556eb77b8020
[ 464.607] (II) Module ABI versions:
[ 464.607] X.Org ANSI C Emulation: 0.4
[ 464.607] X.Org Video Driver: 23.0
[ 464.607] X.Org XInput driver : 24.1
[ 464.607] X.Org Server Extension : 10.0
[ 464.607] (EE) dbus-core: error connecting to system bus: org.freedesktop.DBus.Error.FileNotFound (Failed to connect to socket /var/run/dbus/system_bus_socket: No such file or directory)
[ 464.609] (--) PCI: (0:0:4:0) 10de:1eb8:10de:12a2 rev 161, Mem @ 0xc0000000/16777216, 0x380000000/268435456, 0x390000000/33554432
[ 464.609] (II) no primary bus or device found
[ 464.609] (II) LoadModule: "glx"
[ 464.609] (II) Loading /usr/lib/xorg/modules/extensions/libglx.so
[ 464.610] (II) Module glx: vendor="X.Org Foundation"
[ 464.610] compiled for 1.19.6, module version = 1.0.0
[ 464.610] ABI class: X.Org Server Extension, version 10.0
[ 464.610] (II) LoadModule: "nvidia"
[ 464.610] (II) Loading /usr/lib/xorg/modules/drivers/nvidia_drv.so
[ 464.610] (II) Module nvidia: vendor="NVIDIA Corporation"
[ 464.610] compiled for 4.0.2, module version = 1.0.0
[ 464.610] Module class: X.Org Video Driver
[ 464.610] (II) NVIDIA dlloader X Driver 418.67 Sat Apr 6 02:51:17 CDT 2019
[ 464.610] (II) NVIDIA Unified Driver for all Supported NVIDIA GPUs
[ 464.610] xf86EnableIOPorts: failed to set IOPL for I/O (Operation not permitted)
[ 464.610] (II) Loading sub module "fb"
[ 464.610] (II) LoadModule: "fb"
[ 464.611] (II) Loading /usr/lib/xorg/modules/libfb.so
[ 464.611] (II) Module fb: vendor="X.Org Foundation"
[ 464.611] compiled for 1.19.6, module version = 1.0.0
[ 464.611] ABI class: X.Org ANSI C Emulation, version 0.4
[ 464.611] (II) Loading sub module "wfb"
[ 464.611] (II) LoadModule: "wfb"
[ 464.611] (II) Loading /usr/lib/xorg/modules/libwfb.so
[ 464.611] (II) Module wfb: vendor="X.Org Foundation"
[ 464.611] compiled for 1.19.6, module version = 1.0.0
[ 464.611] ABI class: X.Org ANSI C Emulation, version 0.4
[ 464.611] (II) Loading sub module "ramdac"
[ 464.611] (II) LoadModule: "ramdac"
[ 464.611] (II) Module "ramdac" already built-in
[ 464.637] (EE) NVIDIA: Failed to initialize the NVIDIA kernel module. Please see the
[ 464.637] (EE) NVIDIA: system's kernel log for additional error messages and
[ 464.637] (EE) NVIDIA: consult the NVIDIA README for details.
[ 464.662] (EE) NVIDIA: Failed to initialize the NVIDIA kernel module. Please see the
[ 464.662] (EE) NVIDIA: system's kernel log for additional error messages and
[ 464.662] (EE) NVIDIA: consult the NVIDIA README for details.
[ 464.662] (EE) No devices detected.
[ 464.662] (==) Matched modesetting as autoconfigured driver 0
[ 464.662] (==) Matched fbdev as autoconfigured driver 1
[ 464.662] (==) Matched vesa as autoconfigured driver 2
[ 464.662] (==) Assigned the driver to the xf86ConfigLayout
[ 464.662] (II) LoadModule: "modesetting"
[ 464.662] (II) Loading /usr/lib/xorg/modules/drivers/modesetting_drv.so
[ 464.663] (II) Module modesetting: vendor="X.Org Foundation"
[ 464.663] compiled for 1.19.6, module version = 1.19.6
[ 464.663] Module class: X.Org Video Driver
[ 464.663] ABI class: X.Org Video Driver, version 23.0
[ 464.663] (II) LoadModule: "fbdev"
[ 464.663] (II) Loading /usr/lib/xorg/modules/drivers/fbdev_drv.so
[ 464.663] (II) Module fbdev: vendor="X.Org Foundation"
[ 464.663] compiled for 1.19.3, module version = 0.4.4
[ 464.663] Module class: X.Org Video Driver
[ 464.663] ABI class: X.Org Video Driver, version 23.0
[ 464.663] (II) LoadModule: "vesa"
[ 464.663] (II) Loading /usr/lib/xorg/modules/drivers/vesa_drv.so
[ 464.663] (II) Module vesa: vendor="X.Org Foundation"
[ 464.663] compiled for 1.19.3, module version = 2.3.4
[ 464.663] Module class: X.Org Video Driver
[ 464.663] ABI class: X.Org Video Driver, version 23.0
[ 464.663] (II) NVIDIA dlloader X Driver 418.67 Sat Apr 6 02:51:17 CDT 2019
[ 464.663] (II) NVIDIA Unified Driver for all Supported NVIDIA GPUs
[ 464.663] (II) modesetting: Driver for Modesetting Kernel Drivers: kms
[ 464.663] (II) FBDEV: driver for framebuffer: fbdev
[ 464.663] (II) VESA: driver for VESA chipsets: vesa
[ 464.663] xf86EnableIOPorts: failed to set IOPL for I/O (Operation not permitted)
[ 464.663] (EE) open /dev/dri/card0: No such file or directory
[ 464.663] (WW) Falling back to old probe method for modesetting
[ 464.663] (EE) open /dev/dri/card0: No such file or directory
[ 464.663] (WW) Falling back to old probe method for fbdev
[ 464.663] (II) Loading sub module "fbdevhw"
[ 464.663] (II) LoadModule: "fbdevhw"
[ 464.663] (II) Loading /usr/lib/xorg/modules/libfbdevhw.so
[ 464.663] (II) Module fbdevhw: vendor="X.Org Foundation"
[ 464.663] compiled for 1.19.6, module version = 0.0.2
[ 464.663] ABI class: X.Org Video Driver, version 23.0
[ 464.664] (EE) open /dev/fb0: No such file or directory
[ 464.664] (WW) Falling back to old probe method for vesa
[ 464.664] (WW) VGA arbiter: cannot open kernel arbiter, no multi-card support
[ 464.664] (EE) Screen 0 deleted because of no matching config section.
[ 464.664] (II) UnloadModule: "modesetting"
[ 464.664] (EE) Device(s) detected, but none match those in the config file.
[ 464.664] (EE) 
Fatal server error:
[ 464.664] (EE) no screens found(EE) 
[ 464.664] (EE) 
Please consult the The X.Org Foundation support 
 at http://wiki.x.org
 for help. 
[ 464.664] (EE) Please also check the log file at "/var/log/Xorg.0.log" for additional information.
[ 464.664] (EE) 
[ 464.664] (EE) Server terminated with error (1). Closing log file.




I am using this github repo to setup the video-streamer


If anyone wants the colab notebook for the example then I will add it over here.


For this problem I am really not sure where to file an issue for this so that's why I am writing this here.