Artifacts appeared after exporting of video (High Sierra)

Hello,


The exported video has random artifacts like this:

User uploaded file


These artefacts appeared in the exported video. When in a preview mode, no artifacts are there. The video is a slideshow made from still images only.


I tried different options of export to file, no improvements.


MacMini 2011, CPU i5/16 RAM/SSD, latest iMovie, High Sierra.


Any suggestions?

iMovie '11, macOS High Sierra (10.13.4), MacMini 2011, CPU i5 / RAM 16 / SSD

Posted on Apr 13, 2018 3:56 AM

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Question marked as Top-ranking reply

Posted on Apr 14, 2018 1:40 PM

Rich, thank you!


First, I delete iMovie preferences as you suggested. This didn't change the situation.


Then I decreased dimensions of source images in 4 times. And this helped!


Original dimensions were 3632 × 5456. Size - 5.6 Mb each file. New dimensions are 908 × 1364 which are good enough for my home video.


Thanks again!

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Question marked as Top-ranking reply

Apr 14, 2018 1:40 PM in response to Rich839

Rich, thank you!


First, I delete iMovie preferences as you suggested. This didn't change the situation.


Then I decreased dimensions of source images in 4 times. And this helped!


Original dimensions were 3632 × 5456. Size - 5.6 Mb each file. New dimensions are 908 × 1364 which are good enough for my home video.


Thanks again!

Apr 14, 2018 1:40 PM in response to OlehSilver

Have you tried opening iMovie while holding down the Option and Command keys, and then selecting to delete preferences from the box that appears? Sometimes that cures glitches.


The issue might be confined to one project. Try copying your media from this project into a newly created project and see if you can share out successfully.


You could also try converting the photos to JPEG, plus lowering the resolution -- particularly if these are HEIF formatted photos from iPhone 7 or later.


-- Rich

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Artifacts appeared after exporting of video (High Sierra)

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