从 NSData 分配 AVAsset

Question

Can I initialise AVAsset from NSData .. I know i can initialise AVData from url using the function like

 [[AVURLAsset alloc] initWithURL:url options:nil];

Can any one suggest me a similar way of assigning AVAsset directly from NSData ?

Answer 1

As far as I know, no. AVAsset represents items in the (internal) media library of a device, so initializing it using your custom data wouldn't make much sense. Perhaps it's worth mentioning that this class doesn't have a public initializer for NSData .

I suspect that you should most probably need to redesign your code logic if you need this.

Answer 2

The accepted answer is incorrect.

It is possible to create an AVAsset from an NSData via an AVAssetResourceLoaderDelegate implementation.

Specifically implement:

func resourceLoader(_ resourceLoader: AVAssetResourceLoader, shouldWaitForLoadingOfRequestedResource loadingRequest: AVAssetResourceLoadingRequest) -> Bool

It must:

1. fill in the loadingRequest.contentInformationRequest correctly. Hint, use loadingRequest.contentInformationRequest.contentType = AVFileType.mycontenttype.rawValue
2. respond with data correctly

I'll post some code later, but you can google "AVAssetResourceLoaderDelegate github" for examples

Answer 3

This is an alternate solution the way I solved it. Indirectly I initialised by writing/saving NSData to local directory first and then initialise AVAsset from that filepath.

AVAsset *asset = [AVAsset assetWithURL:[NSURL fileURLWithPath:locationUrl]];

You can try writing your nsdata to filepath first then initialising from that path to AVAsset.

[videoData writeToFile: locationUrl atomically:YES];

Just make sure that file location URL is correct and also test confirm if data is being saved to that file path if anything error happens when loading back. Lastly don't forget to clean up your files if you no longer need them.