Build your AVPlayerItem in a background queue as much as possible (some operations you have to do on the main thread, but you can do setup operations and waiting for video properties to load on background queues – read the docs very carefully). This involves voodoo dances with KVO and is really not fun. The … Read more
You mention that you have looked at AVAnimator, did you download the KittyBoom example project and try it out? The specifics of how it works are detailed in this post. One thing to note is that when you build and run on the device, you need to turn Debug mode off otherwise it will not … Read more
The problem is that Player, your AVAudioPlayer, is a local variable. So it goes out of existence immediately – before it can even start playing, let alone finish playing. Solution: make it a property instead, so that it will persist.
The problem is that when compiling with ARC you need to make sure to keep a reference to instances that you want to keep alive as the compiler will automatically fix “unbalanced” alloc by inserting release calls (at least conceptually, read Mikes Ash blog post for more details). You can solve this by assigning the … Read more
Solved. The trick: use fileURLWithPath:, not URLWithString:. Apparently the difference is really, really significant.
I know you don’t want to use the AVAssetImageGenerator but I’ve also researched this extensively and I believe the only solution currently is using the AVAssetImageGenerator. It’s not that difficult as you say to get the right coordinate because you should be able to get the current time of your player. In my App the … Read more
Your step 2 is way too slow to support real-time rendering… and it looks like you’re missing a couple of steps. For your purpose, you would typically: Setup: create a pool of CVPixelBuffer – using CVPixelBufferPoolCreate create a pool of metal textures using CVMetalTextureCacheCreate For each frame: convert CMSampleBuffer > CVPixelBuffer > CIImage Pass that … Read more
I found that the artworks were being loaded asynchronously while the image was being set synchronously. I solved it this way: – (void)metadata { AVURLAsset *asset = [AVURLAsset URLAssetWithURL:self.fileURL options:nil]; NSArray *titles = [AVMetadataItem metadataItemsFromArray:asset.commonMetadata withKey:AVMetadataCommonKeyTitle keySpace:AVMetadataKeySpaceCommon]; NSArray *artists = [AVMetadataItem metadataItemsFromArray:asset.commonMetadata withKey:AVMetadataCommonKeyArtist keySpace:AVMetadataKeySpaceCommon]; NSArray *albumNames = [AVMetadataItem metadataItemsFromArray:asset.commonMetadata withKey:AVMetadataCommonKeyAlbumName keySpace:AVMetadataKeySpaceCommon]; AVMetadataItem *title = [titles … Read more
This is what I do. I then use an AVAssetExportSession to create the actual file. but I warn you, the CGAffineTransforms are sometimes applied late, so you’ll see a or two of the original before the video transforms. I have no clue why this happens, a different combination of videos will yield the expected result, … Read more
I ran into the same problem of needing multiple live views displayed at the same time. The answer of using UIImage above was too slow for what I needed. Here are the two solutions I found: 1. CAReplicatorLayer The first option is to use a CAReplicatorLayer to duplicate the layer automatically. As the docs say, … Read more