Hi rob35, I'm a little confused as to exactly what you mean. Do you mean: 1) You record an hour of video. Export the recording. The exported recroding is only 30 MB in size, but is the full hour of video? 2) You record an hour of video. Export the recording. The exported recroding is only 30 minutes long? If 1), then are you using one of the recording presets? (e.g. on the Export options window "Preset: Medium Quality, Fast encode, 25 FPS") And, what dimensions are you exporting your video at? (also on the Export options window)