ffmpeg vhook coordinates

Question

Hello everyone,

I am adding a watermark text "xyz" into a video using the following command:-

ffmpeg -sameq -i 'mentos.wmv' -vhook '/usr/lib/vhook/drawtext.so -f /usr/share/fonts/abyssinica/Abyssinica_SIL.ttf -x 50 -y 50 -t xyz' -y 'output.avi'

But when i watch the resulted video, the the co-ordinates for watermark text are not proper. X coordinate is little bit lesser than the y coordinate.

What's the problem?

Please help me.

Thanks in advance.