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I'm using iMovie and try to import a .avi file, 730.5MB. But iMovie keeps saying that "None of the selected files or folders can be imported. Change the selection and try again."
Small .avi files created by my camera are able to be imported, but the 730.5MB one cannot, which was downloaded from Internet. Why can't it be imported? Is it because of its size too large?
I can't tell you why some AVIs can be imported but this one can't, but if you know that the file itself isn't corrupt or anything, I can give you a remedy: Handbrake is an app that can convert almost any video format to MP4, which iMovie should definitely be able to handle. Open Handbrake, select your video file, enter the destination path you want if you don't like the default, and press Start to run the conversion. When it's done, see how iMovie reacts to the MP4. Good luck!
It likely has less to do with the size of the file and more to do with the format in which the audio was encoded. I second the suggestion to download the free application HandBrake and encode the file as an .mov or an .m4v with aac audio. There are presets built into the app, which make it very simple to choose output formats that'll work with whatever hardware & software you're intending to use to play (or edit) the video. HandBrake, also, has advanced options that allow for more granular control of encodings and a fairly active user and development community forum for support. HandBrake is really the best option for maintaining quality while reencoding any video files not of one's own creation and can also be used to rip video directly from disc; there are a number of lighter weight and more simplistic options if you needed to only remux the file.
I would suggest just downloading "Any Video Converter Lite" from the app store and using it to push out a quick mp4 file. Its solid and takes barely any configuring in order to get a workable output. I highly recommend it.
