hat the patch does:
fix gdigrab capture a window with hwnd shows "Invalid window
handle x, must be a vlid integer", althought a valid integer is
input
why:
line 284 of libavdevice/gdigrab.c, one of the condition leads to
check failed is p[0]='\0'. if a integer only string is process,
the p[0] after strtoull process will be null which equal to
'\0', otherwise, a non-integer string will make p[0] not null to
pass the check
how:
change p[0]=='\0' to p[0]!='\0' will works. no any side effect
reproduce and verify:
a simple command: ffmpeg -f gdigrab -i hwnd=12345
* althought a workaround command will work currently:
* ffmpeg -f gdigrab -i hwnd=12345x. (x could be any char)
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