![]() So I tried copying all the codecs from the Mac laptop that *could* open them, but that didn't work. I first assumed it was just a case of not having the right codec. Interestingly, they would not open on one (I think running Lion with QT 10.0), but they DID open on the other newer laptop (running Mountain Lion with QT 10.2). mp4 files on two Mac laptops that a friend of mine has. It also has an audio track (MPEG audio) and a subtitle track. The Media Information pane in VLC says: the codec is "H264 - MPEG-4 AVC (part 10)(avc1)", it is HD resolution (1920 x 1080), it has a frame rate of 59.940060, and the Decoded format is "Planar 4:2:0 YUV". The file will open and play fine in VLC, but I can't do the editing I want there. An invalid sample description was found in the movie." In iMovie, the file is greyed out when I try to import it. When I try to open the file in QT 10, it says "The document “name.mp4” could not be opened" whereas in QT 7 it says "The file could not be opened. I've got a MacBook Pro running OS X 10.6.8 (Snow Leopard). ![]() mp4 movie files, but I can't open them in Quicktime (10.0 or 7.6.6), or iMovie '09 (8.0.6) or Final Cut Express (4.0.1).
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