I can use x11-grab to capture vnc screen with depth 16bit correctly. But with
depth 24 or 32bit, it doesn’t work.
I use this command:
ffmpeg -f x11grab -video_size 1280x720 -framerate 25 -i :5 /tmp/out.yuv
than, display this error:
ffmpeg version N-64657-g2d91b3b Copyright (c) 2000-2014 the FFmpeg developers
built on Jul 15 2014 03:18:27 with gcc 4.6 (Ubuntu/Linaro 4.6.3-1ubuntu5)
libavutil 52. 92.100 / 52. 92.100
libavcodec 55. 69.100 / 55. 69.100
libavformat 55. 46.100 / 55. 46.100
libavdevice 55. 13.102 / 55. 13.102
libavfilter 4. 10.100 / 4. 10.100
libswscale 2. 6.100 / 2. 6.100
libswresample 0. 19.100 / 0. 19.100
libpostproc 52. 3.100 / 52. 3.100
[x11grab @ 0xe8cd00] device: :5 -> display: :5 x: 0 y: 0 width: 1280 height: 720
[x11grab @ 0xe8cd00] shared memory extension found
Segmentation fault (core dumped)
The display info as below:
xdpyinfo -display :5
name of display: :5
version number: 11.0
vendor string: The XFree86 Project, Inc
vendor release number: 40300000
XFree86 version: 4.3.0
maximum request size: 4194300 bytes
motion buffer size: 256
bitmap unit, bit order, padding: 32, LSBFirst, 32
image byte order: LSBFirst
number of supported pixmap formats: 2
supported pixmap formats:
depth 1, bits_per_pixel 1, scanline_pad 32
depth 32, bits_per_pixel 32, scanline_pad 32
keycode range: minimum 8, maximum 255
focus: window 0x40000e, revert to PointerRoot
number of extensions: 24
BIG-REQUESTS
DEC-XTRAP
DOUBLE-BUFFER
Extended-Visual-Information
FontCache
GLX
LBX
MIT-SCREEN-SAVER
MIT-SHM
MIT-SUNDRY-NONSTANDARD
RANDR
RECORD
SECURITY
SGI-GLX
SHAPE
SYNC
TOG-CUP
VNC-EXTENSION
X-Resource
XC-APPGROUP
XC-MISC
XFree86-Bigfont
XTEST
XVideo
default screen number: 0
number of screens: 1
screen #0:
dimensions: 1280x720 pixels (325x183 millimeters)
resolution: 100x100 dots per inch
depths (2): 1, 32
root window id: 0x2e
depth of root window: 32 planes
number of colormaps: minimum 1, maximum 1
default colormap: 0x21
default number of colormap cells: 2048
preallocated pixels: black 0, white 4282370040
options: backing-store YES, save-unders YES
largest cursor: 1280x720
current input event mask: 0xfa8033
KeyPressMask KeyReleaseMask EnterWindowMask
LeaveWindowMask ExposureMask StructureNotifyMask
SubstructureNotifyMask SubstructureRedirectMask FocusChangeMask
PropertyChangeMask ColormapChangeMask
number of visuals: 8
default visual id: 0x24
visual:
visual id: 0x24
class: TrueColor
depth: 32 planes
available colormap entries: 2048 per subfield
red, green, blue masks: 0x7ff, 0x3ff800, 0xffc00000
significant bits in color specification: 8 bits
visual:
visual id: 0x25
class: TrueColor
depth: 32 planes
available colormap entries: 2048 per subfield
red, green, blue masks: 0x7ff, 0x3ff800, 0xffc00000
significant bits in color specification: 8 bits
visual:
visual id: 0x26
class: TrueColor
depth: 32 planes
available colormap entries: 2048 per subfield
red, green, blue masks: 0x7ff, 0x3ff800, 0xffc00000
significant bits in color specification: 8 bits
visual:
visual id: 0x27
class: TrueColor
depth: 32 planes
available colormap entries: 2048 per subfield
red, green, blue masks: 0x7ff, 0x3ff800, 0xffc00000
significant bits in color specification: 8 bits
visual:
visual id: 0x28
class: DirectColor
depth: 32 planes
available colormap entries: 2048 per subfield
red, green, blue masks: 0x7ff, 0x3ff800, 0xffc00000
significant bits in color specification: 8 bits
visual:
visual id: 0x29
class: DirectColor
depth: 32 planes
available colormap entries: 2048 per subfield
red, green, blue masks: 0x7ff, 0x3ff800, 0xffc00000
significant bits in color specification: 8 bits
visual:
visual id: 0x2a
class: DirectColor
depth: 32 planes
available colormap entries: 2048 per subfield
red, green, blue masks: 0x7ff, 0x3ff800, 0xffc00000
significant bits in color specification: 8 bits
visual:
visual id: 0x2b
class: DirectColor
depth: 32 planes
available colormap entries: 2048 per subfield
red, green, blue masks: 0x7ff, 0x3ff800, 0xffc00000
significant bits in color specification: 8 bits
Thank you.
Best Regard!
Li Hui
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