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PO
 

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    <p>A possibility of what is happening here is actually temporary files being saved. You mention that compressing the video seems to trigger this increase in space. </p> <p>There's two ways that you could confirm this by one of two methods. By restarting the device you're testing on. Temporary items will get cleared away by the system either when additional space is required, or when the system shuts down. </p> <p>The other method (and probably more informative) is to investigate the Application through the Xcode organiser. You can do this by selecting the Application on the device and browsing the Applications directory structure. Each application gets 3 directories, /Documents, /Library and /tmp. </p> <p>For intensive operations, that may require the use of a lot of memory, certain libraries will save completed data out to disk, in order to free up memory. Once the operation is completed it will then pass you back a block of data that either references the data in the temporary file, or has the completed data loaded back into memory. This process is completely transparent to the user and developer, and takes advantage of the large amount of flash memory, rather than relying completely on the comparatively limited RAM.</p> <p>In the event that it is not a temporary file, but rather something sitting within the Documents folder of the Application (or even the library), it could be useful to download it to your computer and attempt to investigate its contents, as it may give you some clues as to what is happening.</p> <p>Hope this helps</p> <p>Edited a point for clarity</p>
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    1. POUIImagePickerController Unaccounted memory saved
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    1. USTom Hancocks
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    1. COSo I restarted the phone and unfortunately the data was still there. I will try the other method soon. Do I need to use instruments to use the organiser?
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    2. COOK good news, From the organizer then from my phone I clicked on my app to see the documents and in the tmp folder is a file called trim.IEKOAK.MOV, so it seems that right after I select a video and after it compresses, this video is being saved to my tmp folder. The problem now is why? I'm not telling/coding anything to save that video.
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    3. COIt is extremely likely (almost certain I'd say) that the Image Picker library (when dealing) with movies has to save them to /tmp in order to be able to complete any operations required, such as compression and trimming. The reason for this is because of how large a movie has the potential to become. If you have a 200MB movie, attempting to contain the entirety of that in RAM whilst performing an operation upon it is not an optimal use of resources. The likely order of operation is something like: chunk from original movie > _operation_ > save chunk to /tmp > repeat until operation completed
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