It depends on where the mp4 is coming from.

Camcorder video is much easier to work with than, say, phone video or non-camcorder video.

Though so much depends on the characteristics of the video. There really isn't one kind of mp4. They can be anything from low-rez to hi-def at variety of compression settings and using standard (H.264) as well as non-standard (3ivx) codecs.