importing iMovie project
how to fix error requestcvpixelbufferforframe
returned:3 for absuluteframe:6786
Mac mini, macOS 13.4
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The error means that there is corruption at or around frame 6786. Likely it is a black frame. You need to scroll to frame 6786 and scroll around the area looking for black frames, white flashes, artifacts or any other signs of corruption. Cut out any that you find. Best to work with a duplicate of your project so as to preserve the integrity of your original.
To find the point in time on the timeline where frame 6786 appears, divide 6786 by the frame rate of your project to get the time point in seconds. Then divide the seconds by 60 seconds/minute to get the time point in minutes. So, for example, if you have a 30fps project, divide 6786 by 30 and divide the answer by 60. The frame rate of your project will be the frame rate of the very first video clip (not photo) that you placed into the newly created project.
Another way is to use the below link to an online frame to time converter so that you can locate the point in time at which frame 6786 occurs.
https://www.zapstudio.net/framecalc/
You will need the frame rate of your project to enter into the converter in order for it to make the calculation. Then you enter the frame number of 6786.
The converter will give you the time point in the timeline at which frame 6786 is located. That's the area that you want to scroll around to see if you can find any black frames or other corruption that you can remove.
-- Rich