Why is trimming video inaccurate in Aperture 3

In Aperture 3 I'm creating a Slideshow made up of images and videos.
I noticed that the sections I trim are not reflected when I preview the end result.
I tried shutting down and restarting Aperture only to find that the video is trimmed in the wrong area.
Is there a limit as far as how many seconds remaining after trimming or is there a limit for front end and back end trimming of the video clip?

Well you could try going into Prefs, set external video editor to quicktime, and trim it there. Aperture is not a replacement for a video editor. I'd edit in quicktime, or iMovie, and then bring it back into aperture. Or even better, export slide sequence slideshows from aperture and then bring those movie clips into Final Cut to make a movie. Or iMovie. Just a thought.

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Have you done some cleaning and cleared caches on your Mac? Maybe the com.apple.xpchelper.cache file is missing. Check the folder /System/Library/Caches/
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Earlier today I exported a video from my Aperture library to my desktop, but I got an error message saying that the process did not complete and now the only thing that's left in Aperture is an image preview with a yellow triangle. Aperture says it cannot locate the reference file and there is nothing on the desktop either. I tried to explore the database, but the .mov file has gone from the masters folder. I tried to repair the database, but it did not work. I tried to use data recovery software, but they did not find any trace of that video. I am not using vaults. I looked on the Internet for similar cases, but could not find anything. The video was made from an iPhone 5, but I did not have an iTunes backup so I can't get it back that way. I tried anyway o recover data from the iPhone's flash memory, but the videos are gone. My last Time Machine backup does not include a copy of that movie either...
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I have just opened a bug report. Here is the content for information:
Hi,
I would like to report a bug with Aperture 3.4.3. It is the same issue as reported by another user under reference case #13497037.
On 31/03/13, I exported a video out of Aperture. The file was originally created by an iPhone5 in full HD. Its name was IMG_159.MOV and it was 105MB large. I selected the file in Aperture and exported the original to a folder on the desktop based on the project name and version name. Aperture started the export process, but after a short while I got an error message saying that the export had failed. Immediately after the message, a yellow triangle appeared on the video and it will not play anymore.
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That video file was not backed-up yet so for the moment I have completely lost it, which is a problem as this was an important video.
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After you take your video and it appears on that little strip at the bottom, click and drag the video you want to trim onto your desktop. Then right click and choose Open With > Quicktime Player.app (It should be default.)
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northgal
Lots of ways to go on this. But, I think starting with a definition of the source media and how you are setting up the project is going to be the path to success. So, we need to zero in on questions/answers related to what I wrote earlier
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b. What is the file extension for the file with the AVCHD video compression. Again, what is the frame size, frame rate, interlaced or progressive, pixel aspect ratio?
c. What are the video and audio compression of the files with the .mov file extension and what is the frame size, frame rate, interlaced or progressive, pixel aspect ratio?
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http://mediaarea.net/en/MediaInfo
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OR
We would not necessarily get more information, but we would get enough to put us in a good position, if we run the types through gspot utility (good for codec and basic information)...less bloatware concerns
http://www.headbands.com/gspot/
The dialog that you would get from gspot would look like
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OR
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We will be watching for your results.
Thank you.
ATR

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Why is trimming video inaccurate in Aperture 3

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