I try to export an audio file from the iPod-Library. I want to create with this iPod-Library file an new file. In the AV Foundation Programming Guide in chapter Reading and Writing Assets there is a little example. However this code doesn't work for me. 4 errors happens
Export Status 4 Error Domain=AVFoundationErrorDomain
Code=-11800 "The operation could not be completed"
UserInfo=0x1edfa0 {NSLocalizedFailureReason=An unknown error occurred (-12124),
NSUnderlyingError=0x1ebdc0 "The operation couldn’t be completed. (OSStatus error -12124.)",
NSLocalizedDescription=The operation could not be completed}
My code
AVURLAsset *objAvUrlAsset = [[AVURLAsset alloc] initWithURL:[tempArray objectAtIndex:0] options:nil];
NSLog(@"%s objAvUrlAsset %@", __FUNCTION__, objAvUrlAsset);
NSArray *compatiblePresets = [AVAssetExportSession exportPresetsCompatibleWithAsset:objAvUrlAsset];
NSLog(@"%s compatiblePresets %@", __FUNCTION__, compatiblePresets);
if ([compatiblePresets containsObject:AVAssetExportPresetAppleM4A]) {
AVAssetExportSession *exportSession = [[AVAssetExportSession alloc]
initWithAsset:objAvUrlAsset presetName:AVAssetExportPresetAppleM4A];
NSString * exportPath = [NSString stringWithFormat:@"testTrack1.M4A"];
NSURL *exportURL = [NSURL fileURLWithPath:exportPath];
exportSession.outputURL = exportURL;
exportSession.outputFileType = AVFileTypeAppleM4A;
exportSession.shouldOptimizeForNetworkUse = YES;
NSLog(@"%s export Session %@",__FUNCTION__, exportSession);
[exportSession exportAsynchronouslyWithCompletionHandler: ^(void) {
// export completed
NSLog(@"Export Status %d %@", exportSession.status, exportSession.error);
}];
[exportSession release];
}
the nslog message
-[MyLocalMusicLibrary getAllTracks] objAvUrlAsset AVURLAsset: 0x1dd5a0, URL = ipod-library://item/item.mp3?id=-212958261728896866
-[MyLocalMusicLibrary getAllTracks] compatiblePresets (
AVAssetExportPresetAppleM4A,
AVAssetExportPreset960x540,
AVAssetExportPresetLowQuality,
AVAssetExportPresetMediumQuality,
AVAssetExportPreset640x480,
AVAssetExportPresetHighestQuality,
AVAssetExportPreset1280x720
)
-[MyLocalMusicLibrary getAllTracks] export Session AVAssetExportSession: 0x1e85c0,
asset = AVURLAsset: 0x1dd5a0, URL = ipod-library://item/item.mp3?id=-212958261728896866,
presetName = AVAssetExportPresetAppleM4A, outputFileType = com.apple.m4a-audio
-[MyLocalMusicLibrary getAllTracks] Export Status 4 Error Domain=AVFoundationErrorDomain
Code=-11800 "The operation could not be completed"
UserInfo=0x1edfa0 {NSLocalizedFailureReason=An unknown error occurred (-12124),
NSUnderlyingError=0x1ebdc0 "The operation couldn’t be completed. (OSStatus error -12124.)",
NSLocalizedDescription=The operation could not be completed}
How can i fix this four errors. Do i need for this export the AVAssetReader and AVAssetWriter.
I got the same result from AVAssetExportSession
, what the completely useless NSError
is trying to tell you is that the path you're exporting to doesn't fully exist. You'll want to make sure that you create the path to the directory you're placing the file in using NSFileManager
.