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Alfredo, By my understanding, if the material has come off the camcorder with these ‘blocky’ artifacts, there is little that can be done. I have encountered this problem with ‘post’ work on various videos at times. If it has occurred at that time, the problem may have been with not selecting the most appropriate codec for further treatment; but, to emerge from the camcorder, as you imply, having already accumulated artifacts, might suggest that you have an insoluble problem on your hands. My advice would be to bin what you have, go back to ‘square-one’, and upload the material into your computer again. The problem might not necessarily be so bad, on a second attempt.
The problem occurred with me, when I was endeavouring to upscale some 720 x 576 (PAL) video to 1280 x 720px. The advice to tryalternative codecs, eventually paid-off. The format, in that instance, was AVI (if that helps).
Dunedin, New Zealand