ios - AVAssetExportSession in share extension -


i'm trying use avassetexportsession on video selected in share extension , getting

error domain=nsurlerrordomain code=-3000 "cannot create file" userinfo={nslocalizeddescription=cannot create file, nsunderlyingerror=0x14811fdb0 {error domain=nsosstatuserrordomain code=-12124 "(null)"}}

but can create file manually @ same nsurl without error. here function i'm using

func reencodevideo() {     let videoasset = avurlasset(url: video.url)      let videotrack = videoasset.trackswithmediatype(avmediatypevideo)[0] avassettrack     print(videotrack.estimateddatarate)     let exportsession = avassetexportsession(asset: videoasset, presetname: avassetexportpreset1920x1080)     guard let outputurl = uploadablefileurl else {         return     }     let filemanager = nsfilemanager.defaultmanager()     // let created = filemanager.createfileatpath(outputurl.path!, contents: nil, attributes: nil)     if let path = outputurl.path filemanager.fileexistsatpath(path) {         print("file exists")     }     {         try filemanager.removeitematurl(outputurl)         print("deleted")     } catch {         print(error)     }     exportsession?.outputurl = outputurl     exportsession?.outputfiletype = avfiletypequicktimemovie      exportsession?.exportasynchronouslywithcompletionhandler{         print(exportsession?.status)     } }  private var uploadablefileurl: nsurl? {     guard let tempfilename = video.url.lastpathcomponent else {         return nil     }     let filemanager = nsfilemanager.defaultmanager()     guard let containerurl = filemanager.containerurlforsecurityapplicationgroupidentifier(constants.appgroupidentifier) else {         return nil     }     return containerurl.urlbyappendingpathcomponent("videofile.mov") }

i've created file in same directory, avassetexportsession returns error there. ideas i'm doing wrong?

i've tried using avassetreader , avassetwriter, , avassetwriter returns same error when trying start. encode process completes if i'm using documents directory , fails when using shared app group container.

you're issue might related use of document folder , icloud sync. see https://forums.developer.apple.com/message/77495#77495

if : 

guard let containerurl = filemanager.containerurlforsecurityapplicationgroupidentifier(constants.appgroupidentifier) else {         return nil }  let libraryurl = containerurl.urlbyappendingpathcomponent("library", isdirectory: true) let cachesurl = libraryurl.urlbyappendingpathcomponent("caches", isdirectory: true) return cachesurl.urlbyappendingpathcomponent("videofile.mov")

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