iphone - Capturing the output of a video file for frame by frame processing -


i trying grab individual frames video file (7 seconds long) , running huge memory issues.

i loading asset avurlasset creating avassetreader , accompanying avassetreadertrackoutput (with pixel format kcvpixelformattype_32bgra). seems work fine except massive memory hit ends getting app shutdown os instantly.

as call [myavassetreader startreading] memory spikes 25 megs , gets worse there.

even if call [myavassetreader startreading] [myavassetreader cancelreading] , [myavassetreader release] 25 megs never released. gets worse once go loop gathering frames:

cmsamplebufferref sample = [output copynextsamplebuffer];      while( sample != null )     {          cvimagebufferref imagebuffer = cmsamplebuffergetimagebuffer( sample );           // lock image buffer          cvpixelbufferlockbaseaddress( imagebuffer, 0 );              // stuff imagebuffer           // unlock  image buffer          cvpixelbufferunlockbaseaddress( imagebuffer, 0 );           // done sample          cfrelease( sample );           sample = [output copynextsamplebuffer];     }

any clues how free memory avassetreader using?


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