CODEWITHSUNDEEP
objective-ciosipadvideompmovieplayercontroller
elp
elp

Reputation: 8131

Issue on capture screenshot of video

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}

Upvotes: 1

Views: 1290

Answers (1)

elp
elp

Reputation: 8131

Solved.
The trick: use fileURLWithPath:, not URLWithString:. Apparently the difference is really, really significant.

thanks to Noah. https://stackoverflow.com/a/4201419/88461

Upvotes: 6

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