On 2020/1/17 上午2:00, Calvin Walton wrote:
On Thu, 2020-01-16 at 09:08 +0800, fgodt wrote:
By default, this is set to @code{1}, which means that gdigrab will
use
the CAPTUREBLT flag when grabbing images of a window. With this
flag
set, gdigrab will capture the entire contents of a window even if
it is
covered by other windows on the screen.
If this option is set to @code{0}, the image captured will match
what
you see on the screen: the contents of any windows covering the
selected window will be visible in the capture.
Depending on your Windows version and graphics settings, you may
see
the mouse cursor flicker on your screen while capturing with this
option set to @code{1}. If that happens, you can disable CAPTUREBLT
by
setting this option to @code{0}.
Thanks for you suggestion, but there is issue, without the
CAPTUREBLT
flag not change any thing for normal window in captured video, the
worke
same like use CAPTUREBLT flag. So the can capture window even if it
is
covered.
Ah, fun, this is based on a misinterpretation of the windows
documentation:
CAPTUREBLT
Includes any windows that are layered on top of your window in the
resulting image. By default, the image only contains your window.
But according to this StackOverflow response:
https://stackoverflow.com/a/4646999
What that actually means is that CAPTUREBLT includes windows with the
"WS_EX_LAYERED" window style that overlap the window, not *any* window.
Layered windows are described in:
https://docs.microsoft.com/en-us/windows/win32/winmsg/window-features#layered-windows
I think we should unconditionally remove the CAPTUREBLT flag, there's
no need for any options or documentation changes.
Thanks, if we remove CAPTUREBLT flag the user may can't capture layered
window(use WS_EX_LAYERED extended), it is ok for this?
fgodt
_______________________________________________
ffmpeg-devel mailing list
ffmpeg-devel@ffmpeg.org
https://ffmpeg.org/mailman/listinfo/ffmpeg-devel
To unsubscribe, visit link above, or email
ffmpeg-devel-requ...@ffmpeg.org with subject "unsubscribe".
