How to fix ffmpeg & mencoder pushing Persian (RTL) subtitles reversed?

Question

I'm trying to build an application to burn subtitles on videos. The specific task to do is burning Persian (Right-to-left language) subtitles. But I have a problem with it.

When I got several words simuntaneously without any "Enter" between them, the ffmpeg or mencoder push the lines to up. for example if I have three lines, the third lines comes on first line, then the second line, and then the first line prints on the screen.

I have attached two screenshot to be clear about it. As you may see in the second one, there are 9 lines of persian subtitle which should be aligned from 1 on top to 9 on the bottom, but the 9th line appears on the first line on top.

I'm using this code at the moment to burn the subtitles on mp4 videos:

mencoder video.mp4 -sub subtitle.srt -utf8  -o output.mp4 -oac pcm -ovc lavc