6
當保存該記錄在我的應用程序的視頻，如果視頻大小/持續時間過大/長，沒有我的應用程序崩潰日誌/例外。
我的設置：
在我的應用我使用的UIImagePickerController錄製視頻。現在我注意到，如果我製作的視頻長度很長（例如UIImagePickerControllerQualityTypeMedium爲30分鐘，或UIImagePickerControllerQualityTypeIFrame1280x720超過一分鐘），則在保存視頻時，應用程序會崩潰。有時會有，有時沒有警告。現在我開始調試並注意到它與內存有關（malloc_error）。
我使用profiler來檢查分配情況，並注意到當它要保存視頻時，分配突然變得非常大（我猜這是與視頻的臨時內存使用情況有關？），然後才最終崩潰。這裏是探查器的屏幕截圖： 
該應用程序必須能夠記錄最長持續1小時的視頻（以指定的任何質量）。
我曾嘗試：
- 設置picker.videoMaximumDuration短/長
- 調試與分析器/儀器
- 檢查是否有泄漏
- 關閉了所有打開的應用程序&刪除應用程序上設備（用於存儲清潔）以獲得更多內存
代碼：
- (void)openCamera:(id)sender context:(NSManagedObjectContext*)context {
self.context = context;
//Set self as delegate (UIImagePickerControllerDelegate)
[self.picker setDelegate:self];
//If the device has a camera
if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) {
self.picker.sourceType = UIImagePickerControllerSourceTypeCamera;
self.picker.allowsEditing = YES;
self.picker.videoQuality = [Settings videoQualitySetting];
//If the camera can record video
NSString *desired = (NSString *)kUTTypeMovie;
if ([[UIImagePickerController availableMediaTypesForSourceType:self.picker.sourceType] containsObject:desired]) {
//Let the user record video
self.picker.mediaTypes = [NSArray arrayWithObject:desired];
self.picker.videoMaximumDuration = MaxDuration;
}
else {
NSLog(@"Can't take videos with this device"); //debug
}
//Present the picker fullscreen/in popover
if ([Settings shouldDisplayFullScreenCamera]){
[self presentModalViewController:self.picker animated:YES];
[self.masterPopoverController dismissPopoverAnimated:YES];
}
else {
if (!_popover){
_popover = [[UIPopoverController alloc] initWithContentViewController:self.picker];
}
[_popover presentPopoverFromBarButtonItem:sender permittedArrowDirections:UIPopoverArrowDirectionAny animated:YES];
}
}
else {
NSLog(@"Does not have a camera"); //debug
}
}
和代碼時，被攝像：
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
NSString *mediaType = [info objectForKey: UIImagePickerControllerMediaType];
// Save the video, and close the overlay
if (CFStringCompare ((__bridge CFStringRef) mediaType, kUTTypeMovie, 0)
== kCFCompareEqualTo) {
self.tempVideoPath = [[info objectForKey:
UIImagePickerControllerMediaURL] path];
[LocalVideoStorage saveVideo:[NSData dataWithContentsOfPath:self.tempVideoPath name:self.videoName];
[_picker dismissModalViewControllerAnimated: YES];
[[_picker parentViewController] dismissModalViewControllerAnimated:YES];
[_popover dismissPopoverAnimated:YES];
}
}
最後，當它被保存：
+ (NSString*)saveVideo:(NSData*)video:(NSString*)videoName {
NSFileManager *fileManager = [NSFileManager defaultManager];//create instance of NSFileManager
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); //create an array and store result of our search for the documents directory in it
NSString *documentsDirectory = [paths objectAtIndex:0]; //create NSString object, that holds our exact path to the documents directory
NSString *fullPath = [documentsDirectory stringByAppendingPathComponent:[NSString stringWithFormat:@"%@.MOV", videoName]]; //add our video to the path
[fileManager createFileAtPath:fullPath contents:video attributes:nil]; //finally save the path (video)
NSLog(@"Video saved!");
return fullPath;
}
我使用ARC與iOS 5.1 .1
更新： 我已經把上malloc_error_break斷點，並在儀器我可以看到它是由被稱爲：
# Address Category Timestamp Live Size Responsible Library Responsible Caller
0 0x10900000 Malloc 473,29 MB 02:08.951.332 • 496283648 Foundation -[NSData(NSData) initWithContentsOfFile:]
解決方案： 作爲lawicko & john.k.doe說，我試圖加載從視頻它是進入NSData變量的路徑。這導致整個視頻被加載到內存中。相反，這樣做的，我現在只是移動文件（&重命名）copyItemAtPath
你能找到哪種類型的對象有最大的活動字節？ – nhahtdh
@nhahtdh它說，它被稱爲上：'＃\t地址\t類別\t時間戳\t直播\t尺寸\t負責圖書館\t負責來電 0x10900000 \t的malloc 473,29 MB \t 02：08.951.332 \t•基金會\t - [NSData（NSData）initWithContentsOfFile：] ' – Thermometer
'[LocalVideoStorage saveVideo：[NSData dataWithContentsOfPath：self.tempVideoPath] ...'您正在將整個臨時文件讀入一個NSData對象，僅將其保存到磁盤。難道你不能把臨時文件複製到你選擇的永久存儲文件夾中嗎？ – Rog