My guess is that by exporting it from iMovie, you're creating a QuickTime file that uses MPEG-4 compression. You'll probably need to export from QuickTime Player (Pro) to create a "real" straight MPEG-4 (without being "wrapped" inside a QuickTime file). Also, make sure the MPEG-4 file conforms to the specs that your phone will play (dimensions, bit rate, etc.). So, from iMovie, you would use the "expert" settings again to export your movie to the proper dimensions (try 320x240) using a high-quality codec like PhotoJPEG or MJPEGA (make sure to use only *one* field with MJPEGA, though), and high quality audio (16bit, 44kHz, IMA 4:1). 2 cents. - Mark On 10/23/03 6:03 AM, Mark Walker at mark at scip.org.uk wrote: > hello all > > not sure what for but I want to know how to create a video for my > phone - a sony p800 which says it can play mpeg 4 > > so I exported a short piece from imovie 2 using expert settings and > selected MPeg4 and added mp4 extension > > I then bluetoothed it to my phone > > not only does it not play on the phone, I've realised it doesn't play > on my mac [g4pbook] > > according to the mac 'an invalid sample description was found in the file', > > the phone just says it can't play it > > any suggestions? > > I would also be grateful for tips on which export settings to use to > get smallest usable file size for video on the phone > > thanks > > mark >