Ubuntu Multimedia :: Lossless Padding Of H264 Video With Ffmpeg?

I have some videos in an mkv container that are 1920 pixels wide, but less than 1080 pixels high. This causes problems when playing the videos on a PS3 (after converting to an AVCHD system), because the PS3 won't centre the video, leaving a very large black bar at the bottom but none at the top. Is there a way to use mencoder or ffmpeg to losslessly add padding to the top and bottom to make the video 1920x1080?

If I use

Code:

ffmpeg -i video.mkv -acodec copy -vcodec copy -scodec copy -padtop 132 -padbottom 132 out.mkv

then ffmpeg won't do the padding, and the resulting file is basically exactly the same. If I use

Code:

ffmpeg -i video.mkv -acodec copy -vpre libx264-lossless_fast -scodec copy -padtop 132 -padbottom 132 out.mkv

I get

Code:

Output #0, matroska, to 'anr.mkv':
Metadata:
encoder : Lavf52.64.2

[code]......