我对<代码>MPMoviePlayerController有问题( un.mp)。 当我想查阅<代码>duration property时,我收到0,当时我想要查阅thumbnail......,我收到<编码>nil。 关于4号SOS,它不是科索沃。

After all app says to me: The Operation Could Not Be Completed.

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info{
    if([[info objectForKey:UIImagePickerControllerMediaType] isEqualToString:(NSString *)kUTTypeMovie]){
        NSString *tempFilePath = [[info objectForKey:UIImagePickerControllerMediaURL] path];


        NSString *rootPath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0];
        double hashToNameOfFile = [NSDate timeIntervalSinceReferenceDate] * 1000.0;
        NSString *finalPath = [rootPath stringByAppendingPathComponent:[NSString stringWithFormat: @"%.0f.%@", hashToNameOfFile, @"MOV"]];
        NSString *finalPathToThumbRetina = [rootPath stringByAppendingPathComponent:[NSString stringWithFormat: @"thumb_%.0f@2x.%@", hashToNameOfFile, @"jpg"]];
        NSString *finalPathToThumb = [rootPath stringByAppendingPathComponent:[NSString stringWithFormat: @"thumb_%.0f.%@", hashToNameOfFile, @"jpg"]];

        // we do need retina now, we use real name for CoreData
        NSString *finalImage = [finalPath lastPathComponent];
        NSString *finalImageThumb = [finalPathToThumb lastPathComponent];


        if ( UIVideoAtPathIsCompatibleWithSavedPhotosAlbum(tempFilePath)){
            // Copy it to the camera roll.
            UISaveVideoAtPathToSavedPhotosAlbum(tempFilePath, self, @selector(video:didFinishSavingWithError:contextInfo:), tempFilePath);
        }

        // save video to application directory
        NSData *videoData = [NSData dataWithContentsOfFile:tempFilePath];
        if ( [videoData writeToFile:finalPath atomically:YES] ) {
            NSLog(@"SAVED");
        }
        else{
            NSLog(@"NOT SAVED");
        }


        // create thumbnail of video
        MPMoviePlayerController *moviePlayer = [[MPMoviePlayerController alloc] initWithContentURL:[NSURL URLWithString:finalPath]];
        self.mp = moviePlayer;
        [moviePlayer release];

        NSData *videoData2 = [NSData dataWithContentsOfFile:finalPath];
        NSLog(@"LENGTH %i", [videoData2 length]);


        NSLog(@"FINAL PATH %@", finalPath);
        UIImage *image = [[[UIImage alloc] init] autorelease];
        image = [self.mp thumbnailImageAtTime:(NSTimeInterval)1.0 timeOption:MPMovieTimeOptionNearestKeyFrame];
        NSLog(@"%@", [image size]);
        UIImage *thumbImageRetina = [image thumbnailImage:400 transparentBorder:0 cornerRadius:0 interpolationQuality:kCGInterpolationDefault];
        UIImage *thumbImage = [image thumbnailImage:200 transparentBorder:0 cornerRadius:0 interpolationQuality:kCGInterpolationDefault];
        NSData *thumbImageRetinaData = [NSData dataWithData:UIImageJPEGRepresentation(thumbImageRetina, 1.0)];
        NSData *thumbImageData = [NSData dataWithData:UIImageJPEGRepresentation(thumbImage, 1.0)];
        if ( [thumbImageRetinaData writeToFile:finalPathToThumbRetina atomically:YES] ) {
            NSLog(@"RETINA THUMB SAVED");
        }
        else{
            NSLog(@"RETINA THUMB NOT SAVED");
        }
        if ( [thumbImageData writeToFile:finalPathToThumb atomically:YES] ) {
            NSLog(@"THUMB SAVED");
        }
        else{
            NSLog(@"THUMB NOT SAVED");
        }

        // duration of video
        double dur = [self.mp duration];
        NSLog(@"DUR %f", dur);


        TaleRecords *newTaleRecord = (TaleRecords *)[NSEntityDescription insertNewObjectForEntityForName:@"TaleRecords" inManagedObjectContext:_context];

        newTaleRecord.content = finalImage;
        newTaleRecord.date = [NSDate date];
        NSDecimalNumber *latNum = [[NSDecimalNumber alloc] initWithDouble:[self.latitude doubleValue]];
        NSDecimalNumber *longNum = [[NSDecimalNumber alloc] initWithDouble:[self.longitude doubleValue]];
        newTaleRecord.latitude = latNum; // vertical
        newTaleRecord.longitude = longNum; // horizontal
        [latNum release];
        [longNum release];
        newTaleRecord.contentType = [[NSString alloc] initWithFormat:@"cTypeVideo"];
        newTaleRecord.thumb = finalImageThumb;
        newTaleRecord.duration = [NSNumber numberWithDouble:dur];

        newTaleRecord.tale = tales;
        tales.record = [newTaleRecord tale].record;

        NSError *error = nil;
        if (![_context save:&error]) {
            /*
             Replace this implementation with code to handle the error appropriately.

             abort() causes the application to generate a crash log and terminate. You should not use this function in a shipping application, although it may be useful during development. If it is not possible to recover from the error, display an alert panel that instructs the user to quit the application by pressing the Home button.
             */
            NSLog(@"Unresolved error %@, %@", error, [error userInfo]);
            abort();
        }
    }


    [CLController.locationManager stopUpdatingLocation];
    [self dismissModalViewControllerAnimated:YES];
}

www.un.org/Depts/DGACM/index_spanish.htm 更简单的例子

I am doing this:

// save video to application directory
NSData *videoData = [NSData dataWithContentsOfFile:tempFilePath];
if ( [videoData writeToFile:finalPath atomically:YES] ) {
   NSLog(@"SAVED");
}
else{
   NSLog(@"NOT SAVED");
}

www.un.org/Depts/DGACM/index_french.htm 之后,我设立了<代码>MPMoviePlayerController。 例如:

MPMoviePlayerController *moviePlayer = [[MPMoviePlayerController alloc] initWithContentURL:[NSURL URLWithString:finalPath]];
self.mp = moviePlayer;
[moviePlayer release];

But self.mp give me no content. When I want to do [self.mp duration], it returns zero/nil. Path to resource works, but it seems no content is there.

感谢您的帮助。