i want to take a screenshot of a video on my ipad app.
I searched on SO, and i found a lot of sample code. I tried everything but nothing seem to work.
I tried all of this methods:
1) Try with : MPMoviePlayerController
- (void) previewWithPlayer:(NSString*)path image:(UIImageView*)imView
{
MPMoviePlayerController *player = [[MPMoviePlayerController alloc] initWithContentURL:[NSURL URLWithString:path]];
UIImage *thumbnail = [player thumbnailImageAtTime:1.0 timeOption:MPMovieTimeOptionNearestKeyFrame];
[player stop];
[player release];
imView.image = thumbnail;
}
2) Try with : AVAssetImageGenerator - v1
- (void) generateImage:(NSString*)path image:(UIImageView*)imView
{
AVAsset *asset = [AVAsset assetWithURL:[NSURL URLWithString:path]];
AVAssetImageGenerator *imageGenerator = [[AVAssetImageGenerator alloc]initWithAsset:asset];
CMTime time = CMTimeMake(1, 1);
UIImage *thumbnail = [UIImage imageWithCGImage:[imageGenerator copyCGImageAtTime:time actualTime:NULL error:NULL]];
imView.image = thumbnail;
}
13) Try with : AVAssetImageGenerator - v2
- (void) generateImage:(NSString*)path image:(UIImageView*)imView
{
AVURLAsset *asset = [[AVURLAsset alloc] initWithURL:[NSURL URLWithString:path] options:nil];
AVAssetImageGenerator *generator = [[AVAssetImageGenerator alloc] initWithAsset:asset];
generator.appliesPreferredTrackTransform=TRUE;
[asset release];
CMTime thumbTime = CMTimeMakeWithSeconds(2,30);
AVAssetImageGeneratorCompletionHandler handler = ^(CMTime requestedTime, CGImageRef im, CMTime actualTime, AVAssetImageGeneratorResult result, NSError *error){
if (result != AVAssetImageGeneratorSucceeded) {
NSLog(#"couldn't generate thumbnail, error:%#", error);
}
UIImage *thumbImg = [[UIImage imageWithCGImage:im] retain];
imView.image = thumbImg;
[generator release];
};
CGSize maxSize = CGSizeMake(320, 180);
generator.maximumSize = maxSize;
[generator generateCGImagesAsynchronouslyForTimes:[NSArray arrayWithObject:[NSValue valueWithCMTime:thumbTime]] completionHandler:handler];
}
But nothig works.
I tried with MOV, MP4, nothing.
Path is correct, video is working.
NSString *fPath = [[NSBundle mainBundle] pathForResource:#"VideoA" ofType:#"mp4"];
NSLog(#"%#", fPath);
[self generateImage:fPath image:_ImgA];
What's could be the problem? My image view show nothing and no error are returned.
iOS is 6.0/5.1, on iPad simulator/device.
Video is 854×480 pixels, H.264, AAC. About 30Mb of size.
please help me because i'm going crazy with this issue.
thanks.
edit
on device return this error:
couldn't generate thumbnail, error:Error Domain=NSURLErrorDomain
Code=-1 "unknown error" UserInfo=0x1e0a2f30
{NSUnderlyingError=0x1e0a3900 "The operation couldn’t be completed.
(OSStatus error -12935.)", NSLocalizedDescription=unknown error}
Solved.
The trick: use fileURLWithPath:, not URLWithString:. Apparently the difference is really, really significant.
thanks to Noah. https://stackoverflow.com/a/4201419/88461
Related
I want to get a NSArray with all the UIImage from a Live Photo to create a GIF of that. I tried to make screenshots while animating the live photo but it doesn't work.
Can anyone help me?
Thanks!
First step, you need convert a Live Photo to Video, using this:
PHAssetResourceManager.defaultManager().writeDataForAssetResource(assetRes,
toFile: fileURL, options: nil, completionHandler:
{
// Video file has been written to path specified via fileURL
}
Finally, using this library to convert this to GIF, or you can search in google for another way: https://github.com/NSRare/NSGIF
Hope this will help you.
This is what I did to achieve the same thing as you requested.
PHFetchOptions *options = [[PHFetchOptions alloc] init];
options.sortDescriptors = #[[NSSortDescriptor sortDescriptorWithKey:#"creationDate" ascending:NO]];
options.predicate = [NSPredicate predicateWithFormat:#"mediaType == %d", PHAssetMediaTypeImage];
options.predicate = [NSPredicate predicateWithFormat:#"mediaSubtype == %d", PHAssetMediaSubtypePhotoLive];
options.includeAllBurstAssets = NO;
PHFetchResult *allLivePhotos = [PHAsset fetchAssetsWithOptions:options];
NSLog(#"Get total live count : %ld",(unsigned long)allLivePhotos.count);
NSMutableArray *arrAllLiveImagesGroups = [NSMutableArray array];
for (PHAsset *asset in allLivePhotos) {
[asset requestContentEditingInputWithOptions:nil
completionHandler:^(PHContentEditingInput *contentEditingInput, NSDictionary *info) {
NSURL *urlMov = [contentEditingInput.livePhoto valueForKey:#"videoURL"];
NSMutableArray *arrLive = [NSMutableArray array];
NSMutableArray *arrSingleLiveImagesGroup = [NSMutableArray array];
AVURLAsset *asset = [[AVURLAsset alloc] initWithURL:urlMov options:nil];
AVAssetImageGenerator *generator = [[AVAssetImageGenerator alloc] initWithAsset:asset];
generator.requestedTimeToleranceAfter = kCMTimeZero;
generator.requestedTimeToleranceBefore = kCMTimeZero;
for (Float64 i = 0; i < CMTimeGetSeconds(asset.duration) * 5 ; i++){
#autoreleasepool {
CMTime time = CMTimeMake(i, 5);
NSError *err;
CMTime actualTime;
CGImageRef image = [generator copyCGImageAtTime:time actualTime:&actualTime error:&err];
UIImage *generatedImage = [[UIImage alloc] initWithCGImage:image scale:1.0 orientation:UIImageOrientationDown];
[arrLive addObject:generatedImage];
CGImageRelease(image);
}
}
[arrSingleLiveImagesGroup addObject:arrLive];
[arrAllLiveImagesGroups addObject:arrSingleLiveImagesGroup];
}];
}
I want to get the name of the image picked from the library or newly clicked in -
-(void) imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
I am using this code:
-(void) imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
if ([UIImagePickerController isSourceTypeAvailable: UIImagePickerControllerSourceTypeSavedPhotosAlbum])
{
AppDelegate *del = [[UIApplication sharedApplication]delegate];
[self dismissModalViewControllerAnimated:YES];
image = [info objectForKey:UIImagePickerControllerOriginalImage];
NSLog(#"imagekbgfg=====>%#",image);
[self.imageView setImage:image];
imgName = [info objectForKey:UIImagePickerControllerOriginalImage];
del.mainImgName = imgName;
del.imageData = UIImageJPEGRepresentation(image, 1.0);
del.imageApp = image;
}
if ([UIImagePickerController isSourceTypeAvailable: UIImagePickerControllerSourceTypeCamera])
{
image = [info objectForKey:UIImagePickerControllerOriginalImage];
}
}
How can I do this?
Using the code bellow you will get path like:assets-library://asset/asset.JPG?id=79450962-C0FD-484C-808B-83E045F40972&ext=JPG when your picking image from photo album. This path is valid. It contains the asset ID and asset type.
// Firstly get the picked image's file URL.
NSURL *imageFileURL = [info objectForKey:UIImagePickerControllerReferenceURL];
// Then get the file name.
NSString *imageName = [imageFileURL lastPathComponent];
NSLog(#"image name is %#", imageName);
If you want to get image user picked again using the path you get using UIImagePickerController.(Here maybe you want to save the path so that you can read that image back without asking user to pick that image again) You will need the ALAssetsLibrary otherwise you don't need it.
ALAssetsLibrary *library = [[ALAssetsLibrary alloc] init];
__block UIImage *returnValue = nil;
[library assetForURL:imageFileURL resultBlock:^(ALAsset *asset) {
returnValue = [UIImage imageWithCGImage:[[asset defaultRepresentation] fullResolutionImage]];
} failureBlock:^(NSError *error) {
NSLog(#"error : %#", error);
}];
Take a look at the UIImagePickerControllerDelegate Protocol. The string UIImagePickerControllerReferenceURL contains an URL of your file. You could use it to construct the filename from it.
Other than that there seems to be no built-in way to get the file name from an UIImage or UIImageView object.
Reference:
Stackoverflow answer
You can get the file name using below code:
NSURL *assetURL = [imageDic objectForKey:UIImagePickerControllerReferenceURL];
__block NSString *originalFileName = nil;
ALAssetsLibrary *library = [[ALAssetsLibrary alloc] init];
[library assetForURL:assetURL resultBlock:^(ALAsset *asset){
originalFileName = [[asset defaultRepresentation] filename];
}
originalFileName give the original file name of resource.
I want to get nowplaying infomation.
So, following this code:
NSDictionary *info = [[MPNowPlayingInfoCenter defaultCenter] nowPlayingInfo];
NSString *title = [info valueForKey:MPMediaItemPropertyTitle];
NSLog(#"%#",title);
MPMusicPlayerController *pc = [MPMusicPlayerController iPodMusicPlayer];
MPMediaItem *playingItem = [pc nowPlayingItem];
if (playingItem) {
NSInteger mediaType = [[playingItem valueForProperty:MPMediaItemPropertyMediaType] integerValue];
if (mediaType == MPMediaTypeMusic) {
NSString *songTitle = [playingItem valueForProperty:MPMediaItemPropertyTitle];
NSString *albumTitle = [playingItem valueForProperty:MPMediaItemPropertyAlbumTitle];
NSString *artist = [playingItem valueForProperty:MPMediaItemPropertyArtist];
NSString *genre = [playingItem valueForProperty:MPMediaItemPropertyGenre];
TweetTextField.text = [NSString stringWithFormat:#"#nowplaying %# - %# / %# #%#", artist, songTitle, albumTitle,genre];
MPMediaItemArtwork *artwork = [playingItem valueForProperty:MPMediaItemPropertyArtwork];
CGSize newSize = CGSizeMake(250, 250);
UIGraphicsBeginImageContext(newSize);
[[artwork imageWithSize:CGSizeMake(100.0, 100.0)] drawInRect:CGRectMake(0, 0, newSize.width, newSize.height)];
UIImage* newImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
_imageView.image = newImage;
}
if (_imageView.image == nil){
} else {
_tableView.alpha=0.5;
}
}
But this code can get nowplaying infomation from Defautl iPod Application.
How to get nowplaying infomation in Thirdparty music application?
(e.g.: Mobile Safari, Youtube App, gMusic, Melodies etc).
I think this isn't possible. The documentation states that MPNowPlayingInfoCenter is only for setting information on the lock screen.
Here is a related question.
I've come across a weird issue that I've spent ages working on.
I'm basically trying to get the filepath of a photo out of the asset library and draw it on a pdf using the CGRectMake method using the code below:
In the .h file:
#property (strong, nonatomic) UIImage *pdfSnagImage;
In the .m file:
NSURL *url = [[NSURL alloc] initWithString:pdf.photo];
ALAssetsLibrary* library = [[ALAssetsLibrary alloc] init];
[library assetForURL:url resultBlock:^(ALAsset *asset) {
ALAssetRepresentation *rep = [asset defaultRepresentation];
self.filename = [rep filename];
NSLog(#"filename for image is: %#", self.filename);
CGImageRef iref = [rep fullResolutionImage];
if (iref) {
self.pdfImage = [UIImage imageWithCGImage:iref];
NSLog(#"image height %f", self.pdfImage.size.height);
}
} failureBlock:^(NSError *error) {
NSLog(#"Couldn't load asset %# => %#", error, [error localizedDescription]);
}];
UIImage *testImage = self.pdfImage;
[testImage drawInRect:CGRectMake( (pageSize.width - testImage.size.width/2)/2, 350, testImage.size.width/2, testImage.size.height/2)];
What's happening is that the UIImage after the block, testImage is actually being resolved before the block - therefore it is Null, as self.pdfImage is only set within the block.
If I put those lines of code in the block I get an error with the CGRectMake method, Invalid Context 0x0.
How on earth can I assign the self.pdfImage UIImage first then draw it?
The block is executed asynchronously...it's being executed on a separate thread. This is the design of the assets lib api.
I just need to listen to the file slowly or quickly. Any help will be greatly appreciated
AVAudioplayer can't do that, AVPlayer can.
// play audio file as NSURL *url;
NSDictionary *options = [NSDictionary dictionaryWithObject:[NSNumber numberWithBool:NO]
forKey:AVURLAssetPreferPreciseDurationAndTimingKey];
AVURLAsset *urlAsset = [AVURLAsset URLAssetWithURL:url options:options];
NSString *tracksKey = #"tracks";
[urlAsset loadValuesAsynchronouslyForKeys:[NSArray arrayWithObject:tracksKey] completionHandler:
^{
// Completion handler block.
dispatch_async(dispatch_get_main_queue(),
^{
NSError *error = nil;
AVKeyValueStatus status = [urlAsset statusOfValueForKey:tracksKey error:&error];
if (status == AVKeyValueStatusLoaded) {
self.avPlayer = [AVPlayer playerWithPlayerItem:playerItem];
[avPlayer play];
avPlayer.rate = 0.5;
}
else {
// You should deal with the error appropriately.
NSLog(#"The asset's tracks were not loaded:\n%#", [error localizedDescription]);
}
});
}];
thanks but I have solved it as follows:
Install cocos2d http://www.cocos2d-iphone.org/download
[[SimpleAudioEngine sharedEngine] playEffect: (NSString *) pitch (float32) pan (float32) gain (float32)]
its simple and works....
in Swift 3.0 it will be like this -
audioP = try! AVAudioPlayer(contentsOf: URL(fileURLWithPath: selectedPath), fileTypeHint: "caf")
audioP.enableRate = true
audioP.prepareToPlay()
audioP.rate = 1.5
audioP.play()
Hope this helps :)