Hi there.
What is your destination? Do you plan to render the movie and play it out of firewire onto DV tape? Or export a standard DV NTSC movie file? If so, then I recommend that you keep the sequence at default DV NTSC settings (720×480), and instead fit the 640×480 movie into the sequence. Some versions of final cut will correctly cut 640×480 square right into 720×480 non-square with no scale/aspect adjustment needed. But if the 640×480 movie does not cut into the 720×480 sequence full frame – you still get the black bars you mention — then simply double-click the clip already in the sequence to open it in the viewer, go to the motion tab, and adjust the scale and distort values in an exact relationship — ie, if scale is +12.5, then distort aspect should be -12.5. Adjust until the image fits exactly. Then you can apply these same motion tab attributes to the clip in the bin, and continue editing with this clip from the bin.
HOWEVER, perhaps you need a 640×480 movie? Is it for the web? Then there are two possibilities here.
1. One is that your Quicktime movie not actually 640×480. Newer versions of Quicktime sometimes “correct” for non-square pixels and report the dimensions of a 720×480 video as the way it displays at 640×480. So all you have to do is check the dimensions in Final Cut instead of Quicktime. To do this, select the clip and choose “Item Properties” (or hit Apple-9). In there you will see the actual dimensions of the video.
2. It is, in fact, 640×480. In this case, though you have fixed the dimensions of the sequence to match 640×480, there are still a couple of settings you need to change. Select the sequence and choose “Sequence Settings” (or hit Apple-Zero). You need to change the pixel aspect to 4:3 / SQUARE, and make sure that anamorphic is NOT selected. Then re-edit your clip into the timeline, and now it should fit just right.
Cheers. Let me know!
“THE LOST SKELETON OF CADAVRA” –
And more…