Stack Overflow
Stack Overflow

Questions tagged [avassetimagegenerator]

An AVAssetImageGenerator object provides thumbnail or preview images of assets independently of playback.

51 questions
17
votes
3 answers

m3u8 file AVAssetImageGenerator error

I am using AVPlayer to play .m3u8 file. Using AVAssetImageGenerator to extract image out of it using following code : AVURLAsset *asset1 = [[AVURLAsset alloc] initWithURL:mp.contentURL options:nil]; AVAssetImageGenerator *generate1 =…
objectivecdeveloper
  • 1,050
  • 11
  • 29
14
votes
2 answers

generateCGImagesAsynchronouslyForTimes sometimes don't generate entire thumbnails

I'm working on an OS X app that is using AVAssetImageGenerator.generateCGImagesAsynchronouslyForTimes, and it normally works fine. However, once in a while the thumbnail I get back only contains the first few rows of pixels, and the rest is green,…
Addison
  • 3,791
  • 3
  • 28
  • 48
10
votes
1 answer

How do I know when generateCGImagesAsynchronously has completely finished?

I have a requirement to take a video, convert each frame to and image and save these images to disk. I'd like to use AVAssetImageGenerator for efficiency's sake, and have code similar to the following: The issue is that I don't know when all image…
terrafirma9
  • 362
  • 2
  • 15
9
votes
4 answers

How do I implement AVAssetImageGenerator.copyCGImageAtTime in swift

Thus far I have the following let assetUrl = NSURL.URLWithString(self.targetVideoString) let asset: AVAsset = AVAsset.assetWithURL(assetUrl) as AVAsset let imageGenerator = AVAssetImageGenerator(asset: asset); let time : CMTime =…
user379468
  • 3,989
  • 10
  • 50
  • 68
8
votes
1 answer

AVAssetImageGenerator fails at copying image

I am using AVAssetImageGenerator to create an image from the last frame of a video. This usually works fine, but every now and then copyCGImageAtTime fails with the error NSLocalizedDescription = "Cannot Open"; NSLocalizedFailureReason = "This…
Daniel Larsson
  • 6,278
  • 5
  • 44
  • 82
7
votes
2 answers

AVAssetImageGenerator performance issue

I am trying to create a video gallery. To display videos I am using a UICollectionView. Each UICollectionViewCell has a background with video thumbnail. To generate a video thumbnail I am using a method with logic: AVURLAsset *asset = [[AVURLAsset…
Daumantas Versockas
  • 797
  • 1
  • 10
  • 29
7
votes
4 answers

Get orientation from video or thumb obtained with AVAssetImageGenerator

In my application I create videos from single images. Everything works fine, videos are assembled correctly with right size and orientation. They are displayed correctly both in the Apple photo app, from MPMoviePlayer and from the sandbox directory…
Andrea
  • 26,120
  • 10
  • 85
  • 131
5
votes
0 answers

Extract image from video, image color is different swift

I capture video using AVCaptureSession session preset is session!.sessionPreset = AVCaptureSessionPreset1280x720 and extract image from video using this code func videoThumbnails(url: NSURL ){ let asset = AVAsset(URL: url) let…
Muhammad Raza
  • 952
  • 7
  • 24
4
votes
0 answers

generateCGImagesAsynchronously produces duplicate images according to actualTime

I am able to get the frames from a video using AVAssetImageGenerator, and I do so using generateCGImagesAsynchronously. Whenever the result succeeds, I print the requestedTime in seconds as well as the actualTime for that image. In the end, however,…
bruteforce
  • 83
  • 7
3
votes
1 answer

Thumbnail generation for Video fails if video originates from local Library Folder

Using iOS14.5, Swift5.4, Xcode12.5, I try to create a thumbnail image of a video in Swift. It all works for a video that originates from the Internet. However, in my case, the video originates from the Library Folder of the App where it was…
iKK
  • 6,394
  • 10
  • 58
  • 131
3
votes
0 answers

Can't use image thumbnail from live stream(m3u8) in collectionView Swift 4

It's part of my code (written in Swift 4, xcode 9.2), where I want to do that. func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell { let cell =…
Ruben Nahatakyan
  • 372
  • 3
  • 13
3
votes
1 answer

How to get the start and end time for the selected frames from the video using iOS sdk?

What i am trying to do: I am trying to get the start and end time of the frames chosen as in the attachement below: What i have done so far: UIImagePickerController: Implemented and found that start and end time won't be returned from the delegate…
2vision2
  • 4,933
  • 16
  • 83
  • 164
2
votes
1 answer

AVAssetImageGenerator copyCGImageAtTime:actualTime:error: generates 8-bit images from 10-bit video

I've got a 10-bit video on my Mac that I want to extract frames in full 10-bit/channel data. I load my asset, and verify that it's 10-bit: CMFormatDescriptionRef formatDescriptions = (__bridge…
Can Poyrazoğlu
  • 33,241
  • 48
  • 191
  • 389
2
votes
1 answer

Unable to generate thumbnail from video url

I am using the this code for generating thumbnail from a video url AVURLAsset *asset=[[AVURLAsset alloc] initWithURL:videoUrl options:nil]; AVAssetImageGenerator *generator = [[AVAssetImageGenerator alloc] initWithAsset:asset]; …
iYousafzai
  • 1,021
  • 1
  • 10
  • 29
2
votes
0 answers

iOS swift : generateCGImagesAsynchronouslyForTimes takes too long and freezes the app?

I'm getting video thumbnails asynchronously with the following code: let imgGenerator = AVAssetImageGenerator(asset: asset) imgGenerator.generateCGImagesAsynchronouslyForTimes([NSValue(CMTime: CMTimeMake(1, 30))]) {(time1, image, time2,…
Sam
  • 1,101
  • 2
  • 13
  • 26
1
2 3 4