When using vobsub, when displaying subtitles, code {\a6} will mean that the subtitles will be shown in the upper portion of the video.

I would like to know if there is any equivalent code for ffdshow to show subtitles in the upper portion of the video instead of the normal lower portion?

I prefer using ffdshow when viewing subtitles, however, when ffdshow encountered the {\a6} code, it just shows the code as it is, what I'm looking for is a code that will allow ffdshow to interpret that the line should be displayed in the upper portion of the video.

Any help will be greatly appreciated.