Oct 16, 2013 You'll see numbers like 720p or 1080i used to either describe a camera When interlaced video is viewed on screen the human eye doesn't notice the image is based 25fps is 50Hz halved & used in SD or HD. 50fps – Used for HD recordings in PAL countries – gives a really smooth motion pictures. Avidemux opens some 25 fps videos as 50 fps (see Information menu). don't like the result, the video (still 25fps) is played 50fps as marked. I guess that the 50fps probably just was a interlaced 25fps, not a true 50fps. show may have been shot in either 1080i or firstname.lastname@example.org or 50 fps. Then I suppose that trying to convert won't make that much of a difference.