I have two mkv files. They each have two audio tracks, two subtitle tracks, and ffmpegX claims they're PAL (25 fps).

Simply put, my PowerBook isn't fast enough to play these files in VLC, so I want to re-encode them. I'd love to get them playing on my DVP642, but if the video is PAL, I dunno? I'd settle for watching on my computer.

I only need one of the audio tracks (appears to be 6 channel mp4a) and one of the subtitle tracks, alongside the video. What do I need to do to accomplish this (ffmpegX can't deal with the audio as-is, and I need the subtitles too)?