Steve is, as always correct. But, he left out one possibility. Some Blu-Ray players will play data files. They can be songs (MP3), pictures (JPG) and video clips (MT2S or MTS). It varies from player to player. At one point I had three different players, a Panasonic, a Sony and a Samsung. They all worked differently. If I copied the clips from my camera to an "optical disk", generically referred to as a DVD, it would play in one of my players. I think it was the Panasonic, but forget. The Sony has a USB port. I could copy the clips directly to a memory stick and they would play. The Panasonic has a slot in the front for SD cards and it would play from the card straight out of my Panasonic camcorder. I found I could make a collection of clips into a video with Premier Elements, output a MP4 final file to match the 1920x1080p60 originals using the AVCHD menu choice in PrE13. I could copy that file to a "DVD" and, on one player, it played in full HD glory. I emphasise, it was not a "DVD". I did not use the It was video files on a "data DVD". I did not use the Disk choice under Publish and Share. I used the Computer > AVCHD choice. My videos are always short so I can use the AVCHD Disk that Steve mentions. It is format that is is rarely understood or used. It should be because you can make typical home videos in HD on an ordinary DVD drive. You don't need a Blu-Ray burner. He left out that they only work for videos under twenty minutes, maybe even 15. As he said, they are mini Blu-Rays. Blu-Rays, both the mini version and the real ones, are of HD quality, but always "interlaced". Consequently, depending on your source clips, there can be a difference in viewing quality when playing a 1920x1080p60 file and watching that same file after it has been "burned" to a Blu-Ray. Interlacing is a complex process I don't understand. But, I've seen examples of where "progressive" clips become "blurry" when converted to interlaced, especially when the clip is a panned shot. Good luck and I hope this helps a little. Bill
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