Lena via ffmpeg-devel:
> x11grab can capture windows by their ID, but gdigrab can only capture
> windows by their names, internally calling FindWindowW to lookup its
> handle.
>
> This patch simply allows the user to specify a window handle directly.
> Signed-off-by: Lena <l...@nihil.gay>
> ---
> libavdevice/gdigrab.c | 6 +++++-
> 1 file changed, 5 insertions(+), 1 deletion(-)
>
> diff --git a/libavdevice/gdigrab.c b/libavdevice/gdigrab.c
> index c069232472..05d3c0c929 100644
> --- a/libavdevice/gdigrab.c
> +++ b/libavdevice/gdigrab.c
> @@ -273,9 +273,13 @@ gdigrab_read_header(AVFormatContext *s1)
> }
> } else if (!strcmp(filename, "desktop")) {
> hwnd = NULL;
> + } else if (!strncmp(filename, "hwnd=", 5)) {
> + name = filename + 5;
> + + hwnd = strtol(name, NULL, 0);
This won't even compile due to the extra '+'.
> } else {
> av_log(s1, AV_LOG_ERROR,
> - "Please use \"desktop\" or \"title=<windowname>\" to
> specify your target.\n");
> + "Please use \"desktop\", \"title=<windowname>\" or
> \"hwnd=<hwnd>\" to specify your target.\n");
> ret = AVERROR(EIO);
> goto error;
> }
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