Converting NTSC video to MKV

Hi,

I am currently trying to convert some NTSC DVD (zone 1) to MKV Files and I have some problem.

1. The images are frequently looking as blur. Sound it is a fps problem... Which fps should I select in handshake. Actually I leaved it as same as source but sound it was not the good choice.

2. With Handshake, I selected the subtitles english, french and cc caption. During the video, cc caption is working but none of the others.

Any idea?

Thanks,

François