There might be two things going on:
1. You did not capture it as hdv but as dv (downconverted in the camera or no hdv settings in the caputure panel) or
2. It is 1080p and you set up a 720x480 sequence setting.
There might be two things going on:
1. You did not capture it as hdv but as dv (downconverted in the camera or no hdv settings in the caputure panel) or
2. It is 1080p and you set up a 720x480 sequence setting.