Seems stream 0 codec frame rate differs from container frame rate:
1000.00 (1000/1) -> 59.92 (719/12)
Input #0, nuv, from '1121_20100321200000.nuv':
Duration: 27:18:53.22, start: 67708.422000, bitrate: 127 kb/s
Stream #0.0: Video: mpeg4, yuv420p, 1280x720, PAR 1:1 DAR 16:9,
59.92 tbr, 1k tbn, 1k tbc
Stream #0.1: Audio: mp3, 48000 Hz, 2 channels, s16, 128 kb/s
At least one output file must be specified