If you captured PAL at 720x480 30fps, you've done it wrong -- those are NTSC standards.  Your capture hardware and software should have provided an option to capture 720x576 at 25fps.

I didn't notice anything regarding handling deinterlacing.  For proper viewing of PAL material, you want to deinterlace to 50p or 50 output frames per second, which the ffmpeg filter bwdif can do very well.