Incidentally `-y` also collide with avconv global options.

CC: [email protected]
---
 libavdevice/xcbgrab.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/libavdevice/xcbgrab.c b/libavdevice/xcbgrab.c
index 7e9f258..032bbcc 100644
--- a/libavdevice/xcbgrab.c
+++ b/libavdevice/xcbgrab.c
@@ -77,6 +77,8 @@ typedef struct XCBGrabContext {
 static const AVOption options[] = {
     { "x", "Initial x coordinate.", OFFSET(x), AV_OPT_TYPE_INT, { .i64 = 0 }, 
0, INT_MAX, D },
     { "y", "Initial y coordinate.", OFFSET(y), AV_OPT_TYPE_INT, { .i64 = 0 }, 
0, INT_MAX, D },
+    { "grab_x", "Initial x coordinate.", OFFSET(x), AV_OPT_TYPE_INT, { .i64 = 
0 }, 0, INT_MAX, D },
+    { "grab_y", "Initial y coordinate.", OFFSET(y), AV_OPT_TYPE_INT, { .i64 = 
0 }, 0, INT_MAX, D },
     { "video_size", "A string describing frame size, such as 640x480 or 
hd720.", OFFSET(video_size), AV_OPT_TYPE_STRING, {.str = "vga" }, 0, 0, D },
     { "framerate", "", OFFSET(framerate), AV_OPT_TYPE_STRING, {.str = "ntsc" 
}, 0, 0, D },
     { "draw_mouse", "Draw the mouse pointer.", OFFSET(draw_mouse), 
AV_OPT_TYPE_INT, { .i64 = 1 }, 0, 1, D },
-- 
2.1.0

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