ass subtitle are stretched
I compiled ffmpeg with the option --enable-libass on debian sid. I can add ass subtitle with the command -vf "ass=subtitle.ass" but there is a little problem, the subtitles add with ffmpeg are stretched. I don't have this problem with mencoder and I think ffmpeg and mencoder use the same library libass.
In the image to the top you have the subtite load with vlc, with the good size, and to the bottom the subtitle add with ffmpeg.
I tried with several video, codec and subtitle and the result is always the same result.