I am trying to play video on iPad by using this code. It is okay for iOS 6. But, in iOS 7, its self.asset.duration.value is zero. I would like to know how to do.
NSURL *url = [[NSURL alloc] initFileURLWithPath:path];
NSDictionary *options = [NSDictionary dictionaryWithObject:[NSNumber numberWithBool:YES] forKey:AVURLAssetPreferPreciseDurationAndTimingKey];
AVURLAsset *assetToCombine = [AVURLAsset URLAssetWithURL:url options:options];//original
[assetToCombine retain];
NSArray *requestedKey=[NSArray arrayWithObjects:#"duration", nil];
[assetToCombine loadValuesAsynchronouslyForKeys:requestedKey completionHandler:^{
dispatch_async(dispatch_get_main_queue(), ^{
//do nth here
NSLog(#"dispatch_async assetToCombine.duration.value is %lld.",assetToCombine.duration.value);
});
}];
NSLog(#"assetToCombine.duration.value is %lld.",assetToCombine.duration.value);
Related
Alright.. Here's the thing.. I am building an app in which when the user taps on download button it downloads a bunch on images (296, to be exact).
In simulator everything works flawless, on my iPhone (4S) on around 100th image it crashes with error:
malloc: * mach_vm_map(size= "some random number") failed (error code= 3)* error: can't allocate region
libBacktraceRecording.dylib: allocate_free_list_pages() -- virtual memory exhausted!
Here's the code I wrote for downloading those images:
-(void)getData
{
NSError *error;
int i;
NSArray *brojLinije = [[NSArray alloc] initWithContentsOfFile:[[NSBundle mainBundle] pathForResource:#"linije" ofType:#"plist"]];
NSArray *urlSlike = [[NSArray alloc] initWithContentsOfFile:[[NSBundle mainBundle]pathForResource:#"urlSlike" ofType:#"plist"]];
NSArray *pocetno = [[NSArray alloc] initWithContentsOfFile:[[NSBundle mainBundle]pathForResource:#"pocetno" ofType:#"plist"]];
NSArray *sortiranje = [[NSArray alloc] initWithContentsOfFile:[[NSBundle mainBundle]pathForResource:#"sort" ofType:#"plist"]];
NSArray*paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *desktopDir = [paths firstObject];
UIImage *image1 = [[UIImage alloc] init];
for (i = 0; i<296; i++) {
NSString *brojLinije1 = [NSString stringWithFormat:#"%#",[brojLinije objectAtIndex:i]];
NSString *pocetno1 = [NSString stringWithFormat: #"%#", [pocetno objectAtIndex:i]];
NSString *tableSort = [NSString stringWithFormat: #"%#", [sortiranje objectAtIndex:i]];
image1 = [UIImage imageWithData:[NSData dataWithContentsOfURL:[NSURL URLWithString:[NSString stringWithFormat: #"http://www.busevi.com/images/stories/Red-Voznje/Gradski-Prevoz-BG/linija.%#.png", [urlSlike objectAtIndex:i ] ]]]];
NSData *data1 = [NSData dataWithData:UIImageJPEGRepresentation(image1, 0.1)];
NSManagedObjectContext *context = [self.fetchedResultsController managedObjectContext];
NSEntityDescription *entity = [[self.fetchedResultsController fetchRequest] entity];
NSManagedObject *newManagedObject = [NSEntityDescription insertNewObjectForEntityForName:[entity name] inManagedObjectContext:context];
NSString *pngFilePath = [NSString stringWithFormat:#"%#%#.jpg",desktopDir,[urlSlike objectAtIndex:i]];
[data1 writeToFile:pngFilePath atomically:YES];
[newManagedObject setValue:brojLinije1 forKey:#"brojLinije"];
[newManagedObject setValue:data1 forKey:#"imageData"];
[newManagedObject setValue:pocetno1 forKey:#"pocetnoStajaliste"];
[newManagedObject setValue:tableSort forKey:#"sort"];
NSLog(#"%d / 296", i);
}
[self.managedObjectContext save:&error];
}
Only thing I know is that the image allocation frequency (too much allocating and no time to automatically release) is making the problem, AND that I have tried every method I know so far, AND I HAVE watched A LOT of "Instruments" app tutorials and only one helped (to find the source of filling virtual memory) but I still can't solve my problem.
You can use a local autorelease pool inside of the loop to immediately release any objects that were created in the body of the loop.
for (i = 0; i<296; i++) {
#autoreleasepool {
// loop body goes here...
}
}
While using SDWebImage framework I encountered a lot of bugs and unanswered crashes from the app. SDWebImage is awesome if the count of images that are about to be downloaded is lower that, let's say 50. Because, when downloading one by one image that are showed in TableViewCell + fast scrolling (fast flicking), the app receives memory warning a couple of times while the TableView is still scrolling (SDWebImage will clear memory ONLY when TableView is slowly scrolling or not scrolling at all) so it crashes the app.
So my only solace with app crashing while downloading 300+ images was simple Apple's method called dispatch_async. More about it here.
And this is how I solved my problem (I just had to move everything from my original -(void)getdata method to dispatch_async block. DONE!
So now it looks like this:
-(void)getData {
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
NSLog(#"Downloading Started");
slike = [[NSArray alloc]initWithContentsOfFile:[[NSBundle mainBundle] pathForResource:#"slike" ofType: #"plist"]];
brojevi = [[NSArray alloc]initWithContentsOfFile:[[NSBundle mainBundle] pathForResource:#"linije" ofType:#"plist"]];
pocetnaStajalista = [[NSArray alloc]initWithContentsOfFile:[[NSBundle mainBundle] pathForResource:#"pocetno" ofType:#"plist"]];
sort = [[NSArray alloc]initWithContentsOfFile:[[NSBundle mainBundle]pathForResource:#"sort" ofType:#"plist"]];
NSEntityDescription *entity = [NSEntityDescription entityForName:#"Linija" inManagedObjectContext:self.managedObjectContext];
NSString *brojLinije;
NSString *pocetnoStajaliste;
NSString *sortiranje;
NSData *data;
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *filePath = [NSString stringWithFormat:#"%#/%#", documentsDirectory,#"filename.png"];
for (int i = 0; i<314; i++) {
NSManagedObject *novaLinija = [[NSManagedObject alloc]initWithEntity:entity insertIntoManagedObjectContext:self.managedObjectContext];
brojLinije = [NSString stringWithFormat:#"%#",brojevi[i]];
pocetnoStajaliste = [NSString stringWithFormat:#"%#",pocetnaStajalista[i]];
data = [NSData dataWithContentsOfURL:[NSURL URLWithString:[NSString stringWithFormat: #"http://www.busevi.com/images/stories/Red-Voznje/Gradski-Prevoz-BG/linija.%#.png",slike[i]]]];
[data writeToFile:filePath atomically:YES];
sortiranje = [NSString stringWithFormat: #"%#", sort[i]];
[novaLinija setValue:data forKey:#"slikaLinije" ];
[novaLinija setValue:brojLinije forKey:#"brojLinije"];
[novaLinija setValue:pocetnoStajaliste forKey:#"pocetnoStajaliste"];
[novaLinija setValue:sortiranje forKey: #"sort"];
NSLog(#"%d / 314", i+1);
NSError *error;
[self.managedObjectContext save:&error];
} }
Hope this helps others with same problem. Good Luck and Happy Coding!
Used all of your and my suggestions and possible solutions, but, I'm sorry, none worked.
The point in this case, when app needs to download A LOT of photos, you really should use SDWebImageDownloader Class Reference.
I know It's frustrating to change the whole method and to realize the previous method (of downloading photos) is useless, so HERE is the tutorial and example on how to use SDWebImageDownloader Class. Good Luck.
I am using this for reference: Getting thumbnail from a video url or data in IPhone SDK
The method is using the MPMoviePlayerController class instead of the AVFoundation, and I think I want to use that as well because the people said that MPMoviePlayer way is faster than the AVFoundation way.
The problem is, the method used to create the thumbnails, [player thumbnailImageAtTime:1.0 timeOption:MPMovieTimeOptionNearestKeyFrame] is deprecated in iOS 7.0.
By looking at the apple docs, the remaining supported ways to create thumbnails are by the methods (void)requestThumbnailImagesAtTimes:(NSArray *)playbackTimes timeOption:(MPMovieTimeOption)option and (void)cancelAllThumbnailImageRequests. But, as the method signatures dictate, these methods return nothing. So how do I access the UIImage thumbnail created by these methods?
If it helps, this is what I have so far in terms of code:
self.videoURL = info[UIImagePickerControllerMediaURL];
NSData *videoData = [NSData dataWithContentsOfURL:self.videoURL];
//Create thumbnail image
MPMoviePlayerController *player = [[MPMoviePlayerController alloc] initWithContentURL:self.videoURL];
[player requestThumbnailImagesAtTimes:#[#1] timeOption:MPMovieTimeOptionNearestKeyFrame];
//UIImage *thumbnail = ???
How do I get a UIImage reference to the thumbnail?
EDIT
I figured out how to create a notification for the thumbnail image request (using this question as reference). However, I realise that this method works asynchronously from the main thread, and so my notification handler method doesn't seem to ever be called.
This is what I have now.
self.videoURL = info[UIImagePickerControllerMediaURL];
NSData *videoData = [NSData dataWithContentsOfURL:self.videoURL];
MPMoviePlayerController *player = [[MPMoviePlayerController alloc] initWithContentURL:self.videoURL];
[[NSNotificationCenter defaultCenter] addObserver:self selector:#selector(handleThumbnailImageRequestFinishNotification:) name:MPMoviePlayerThumbnailImageRequestDidFinishNotification object:player];
[player requestThumbnailImagesAtTimes:#[#1] timeOption:MPMovieTimeOptionNearestKeyFrame];
And then my handler method:
-(void)handleThumbnailImageRequestFinishNotification:(NSNotification*)notification
{
NSDictionary *userinfo = [notification userInfo];
NSError* value = [userinfo objectForKey:MPMoviePlayerThumbnailErrorKey];
if (value != nil)
{
NSLog(#"Error creating video thumbnail image. Details: %#", [value debugDescription]);
}
else
{
UIImage *thumbnail = [userinfo valueForKey:MPMoviePlayerThumbnailImageKey];
}
But the handler never gets called (or so it appears).
Try this way.
import AVFoundation framework
in *.h
#import <AVFoundation/AVFoundation.h>
in *.m
AVURLAsset *asset = [[AVURLAsset alloc] initWithURL:self.urlForConevW options:nil];
AVAssetImageGenerator *generateImg = [[AVAssetImageGenerator alloc] initWithAsset:asset];
NSError *error = NULL;
CMTime time = CMTimeMake(1, 65);
CGImageRef refImg = [generateImg copyCGImageAtTime:time actualTime:NULL error:&error];
NSLog(#"error==%#, Refimage==%#", error, refImg);
UIImage *FrameImage= [[UIImage alloc] initWithCGImage:refImg];
Here is a code to make a thumbnail of the video and save the images to the DocumentDirectory..
//pass the video_path to NSURL
NSURL *videoURL = [NSURL fileURLWithPath:strVideoPath];
AVURLAsset *asset1 = [[AVURLAsset alloc] initWithURL:videoURL options:nil];
AVAssetImageGenerator *generator = [[AVAssetImageGenerator alloc] initWithAsset:asset1];
generator.appliesPreferredTrackTransform = YES;
//Set the time and size of thumbnail for image
NSError *err = NULL;
CMTime thumbTime = CMTimeMakeWithSeconds(0,30);
CGSize maxSize = CGSizeMake(425,355);
generator.maximumSize = maxSize;
CGImageRef imgRef = [generator copyCGImageAtTime:thumbTime actualTime:NULL error:&err];
UIImage *thumbnail = [[UIImage alloc] initWithCGImage:imgRef];
//And you can save the image to the DocumentDirectory
NSData *data = UIImagePNGRepresentation(thumbnail);
//Path for the documentDirectory
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
[data writeToFile:[documentsDirectory stringByAppendingPathComponent:currentFileName] atomically:YES];
If your URL is to an HTTP live stream, then it won't return anything, per the docs. For a file URL, I found that I had to start the request after playing the movie, or it would never get called.
i am using a lot the AVRecorder and AVPlayer.
i saw that they both , delay when i am back to my app ,after she was on background- then if for example i am trying to record , it takes 4 seconds till it starts .
in my code, i am preparing to record before i am recording, but when back to app, it doesnt help .
what can i do to improve it ?
this is done when app is open(at the start, not when back from background! )
-(void)prepareToRecord
{
NSArray *dirPaths;
NSString *docsDir;
NSString *sound=[NSString stringWithFormat:#"sound%d.caf",[memoryInstnace getNextFreePlace]];
dirPaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) ;
docsDir = [dirPaths objectAtIndex:0];
currentSoundFilePath = [docsDir stringByAppendingPathComponent:sound];
NSURL *soundFileURL = [NSURL fileURLWithPath:currentSoundFilePath];
NSDictionary *settings = [NSDictionary dictionaryWithObjectsAndKeys:
[NSNumber numberWithFloat: 44100.0], AVSampleRateKey,
[NSNumber numberWithInt: kAudioFormatAppleLossless], AVFormatIDKey,
[NSNumber numberWithInt: 1], AVNumberOfChannelsKey,
[NSNumber numberWithInt: AVAudioQualityMax], AVEncoderAudioQualityKey,
nil];
NSError *error;
recorder = [[AVAudioRecorder alloc] initWithURL:soundFileURL settings:settings error:&error];
//to not having a delay befor record
AVAudioSession *audioSession = [AVAudioSession sharedInstance];
[audioSession setCategory:AVAudioSessionCategoryRecord error:nil];
if (recorder)
{
[recorder prepareToRecord];
recorder.meteringEnabled = YES;
}
else
NSLog( #"error in recordings" );
}
thanks !
If another app had grabbed the control of the mic via starting an active AVAudioSession, then iOS will fade out control from that app and give it to you when you activate your session. This can take a second or two. Is this what is happening? or is something else slowing you down?
I'm making an app that downloads movies from the server and stores them localy in the NSDocumentDirectory.
This works fine.
I want to add a thumbnail generated from each movie in front of the name in each cell.
My problem:
How can I generate a thumbnail from a movie after it is downloaded (so instantly, without having to play the movie first)? I want to store the thumbnails with the same name of the movie as a jpg in the NSDocumentDirectory.
My guess
-download movie and store it in NSDocumentDirectory (works)
-somehow load the movie in the MPMoviePlayerController's memory (don't know how)
-when loaded in memory, generate thumbnail with thumbnailImageAtTime (MPMovieTimeOptionNearestKeyFrame) (should work)
-store it (should work)
If anyone could help me...
Thanks
#import <MediaPlayer/MediaPlayer.h>
-(UIImage*)getFirstFrameFromVideoFile:(NSString*)sourceFilePath {
NSURL *videoURL = [NSURL fileURLWithPath:sourceFilePath];
MPMoviePlayerController *player = [[MPMoviePlayerController alloc] initWithContentURL:videoURL];
UIImage *thumbnail = [player thumbnailImageAtTime:1.0 timeOption:MPMovieTimeOptionNearestKeyFrame];
//Player autoplays audio on init
[player stop];
[player release];
return thumbnail;
}
Other tasks you know already.
Yes, using MPMoviePlayer works... but you must be sure that you do not have another movie player playing elsewhere in your app (even the UIWebView plug-in...) or you will get in trouble.
I do this way:
UIImage *thumbnail = nil;
NSURL *url = [NSURL fileURLWithPath:pathname];
AVURLAsset *asset = [[AVURLAsset alloc] initWithURL:url options:nil];
AVAssetImageGenerator *generator = [[AVAssetImageGenerator alloc] initWithAsset:asset];
generator.appliesPreferredTrackTransform = YES;
NSError *error = nil;
CMTime time = CMTimeMake(3, 1); // 3/1 = 3 second(s)
CGImageRef imgRef = [generator copyCGImageAtTime:time actualTime:nil error:&error];
if (error != nil)
NSLog(#"%#: %#", self, error);
thumbnail = [[UIImage alloc] initWithCGImage:imgRef];
CGImageRelease(imgRef);
Hope this might help
This is the code I use which should generate the thumbnail
(added a big uiimageview for testing, works when I load a local image in it)
NSString *path;
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
path = [[paths objectAtIndex:0] stringByAppendingPathComponent:#"snijtechniekendir/videos"];
path = [path stringByAppendingPathComponent:[videos objectAtIndex:indexPath.row]];
NSURL *videoURL = [NSURL fileURLWithPath:path];
NSLog(#"video url: %#", videoURL);
MPMoviePlayerController *player = [[MPMoviePlayerController alloc] initWithContentURL:videoURL];
UIImage *thumbnail = [player thumbnailImageAtTime:1 timeOption:MPMovieTimeOptionNearestKeyFrame];
UIImageView *cellimage = [[UIImageView alloc] initWithFrame:CGRectMake(2, 2 , 400, 400)];
[cell.contentView addSubview:cellimage];
NSData *imgData = UIImagePNGRepresentation(thumbnail);
NSLog(#"lenght of video thumb: %#", [imgData length]);
[self.view addSubview:cellimage];
[cellimage setImage:thumbnail];
This is the log for one video file
video url: file://localhost/Users/Home/Library/Application%20Support/iPhone%20Simulator/5.1/Applications/78C165BB-75A9-46A2-A257-469F8652A665/Documents/snijtechniekendir/videos/snijtechniek%2520brunoise.mp4
lenght of video thumb: (null)
I'm using next snippet to loadValues synchronously, so loading = NO never fires.
And I have the same problem with AVAssetExportSession exportAsynchronously.
It's all not working only on device.
NSDictionary *options = [NSDictionary dictionaryWithObject:[NSNumber numberWithBool:YES] forKey:AVURLAssetPreferPreciseDurationAndTimingKey];
AVURLAsset *asset = [AVURLAsset URLAssetWithURL:URL options:options];
NSArray *keys = [NSArray arrayWithObjects:#"duration", #"tracks", nil];
__block bool loading = YES;
[asset loadValuesAsynchronouslyForKeys:keys completionHandler:^(void) {
loading = NO;
}];
while (loading)[[NSRunLoop currentRunLoop] runUntilDate:[[NSDate date] dateByAddingTimeInterval:0.5]];
Please, help! My brain is melting.
Here is the code I use:
NSURL *url = [NSURL fileURLWithPath:[[NSBundle mainBundle] pathForResource:#"intro" ofType:#"m4v"]];
self.asset = [[AVURLAsset alloc] initWithURL:url options:nil];
NSString *tracksKey = #"tracks";
[self.asset loadValuesAsynchronouslyForKeys:[NSArray arrayWithObject:tracksKey] completionHandler:^{
// Other code here for AVPlayer
}];
I don't use any options or anything of that nature. I'm sure you've seen Apple's documentation example:
http://developer.apple.com/library/ios/#documentation/AudioVideo/Conceptual/AVFoundationPG/Articles/02_Playback.html