Take a look at this 2011

#215930
AvatarJackWolcott
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Take a look at this 2011 Videomaker Forum exchange for a start: https://www.videomaker.com/community/forums/topic/convert-sd-to-hd-is-it-really-possible It may answer some of your questions.

Generally speaking, upres from SD to HD is unsatisfactory as there are simply not enough pixels in the SD format to permit a successful upres. At the very least you will have letter-boxing and almost certainly a softening of the PD-170 image. You might try using Handbrake to convert the SD to MP4 and see if that helps.

iMovie, like Windows Movie Maker would not be my software of choice. I suspect you’ll get more satisfactory results using Final Cut Express although I’m not a Mac user and am only guessing at this.

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