Nothing is free in this world, but Quicktime Pro is pretty cheap and very powerful... The tools you seek are available under Pro.
You just have to "export" the file, you will be given a choice of file formats, both video and audio.
On modern Macs some of these tools are available with out Pro through iMovie and iTunes though not as flexible.
And coming in Quicktime 7 is direct audio and video recording... including from seperate sources, for example video from the DV camera and audio from mixing board... cool
