Redcing .mkv file size

[starfake]

I have a movie in .mkv which is 5 GB. I need to make it 4.37 so I can burn it to the DVD.
Could someone tell me please a free and easy to use application to do that as well as a actual way of doing that. And what will i get as a result mkv, mov or avi and what's better to use on Mac, PC and divx compatible dvd players (portable as well)

Thank you very much for you help!

 

[speakerwizard]

I keep everything in mp4, its mac / appletv friendly, you can use quicktime pro to export as mp4 and 'passthrough' the video (this doesnt recompress just takes the h264 from the mkv to put in the mp4) and change the audio to aac, this doesnt take long as your only re-encoding the audio.

you can also compress in quicktime pro but its a little slow so i use visualhub for that (it has presets but i tend to just put in the sizes i want to use.)

 

[starfake]

Visualhub isn't free as far as I can see...
Is there anything similar?

Oh, and one more thing. MKV has 3 audio tracks, can I keep that in mp4?? Or can I keep just two?