Hi! This does come up very often in this forum, but I have never read a satisfying answer, although I searched through old threads. The question I want to dedicate a whole thread to would be: It happens to me (and obviously others) a lot that I have video and audio stream data inside one container (.avi, .mov, .mp4, .mkv, ... or even .mts, .dv, ...) but my editing software or playback device (or myself) requires another container but would be okay with the codec inside. Is there a software, preferably with a GUI, commercial or non-commercial that can do just this? Extracting the stream content from one container and muxing and packing it into another without re-encoding everything? I honestly don't know of one. I always recommend the command-line-tool ffmpeg, because I come from Linux and know it pretty well, but it is not very comfortable and has its problems with HD movies. Any ideas?