avassetexportsession

I am trying to add chapter markers (text + images) to an existing video in iOS. Reading them is trivially easy with builtin functions: NSLocale * locale = [chapterLocalications lastObject]; NSLog(@"Locale: %@", [locale localeIdentifier]); NSArray *keys = @[AVMetadataCommonKeyTitle, AVMetadataCommonKeyArtwork]; NSArray *chapters = [asset chapterMetadataGroupsWithTitleLocale:locale containingItemsWithCommonKeys:keys]; for (AVTimedMetadataGroup * metadataGroup in chapters) { NSArray * items = metadataGroup.items; CMTimeRange timeRange = metadataGroup.timeRange; NSLog(@"time: %@",

I'm recording audio using device microphone with AVAudioRecorder which return file in .caf format that is playable only in Apple devices but not on Android devices. Since Apple is not supporting .mp3 file so I want to convert it in .mp4 format before uploading to server. Is .mp4 is good for audio only? Can I convert it with AVAssetExportSession ? Following is audio recorder code: func setupAudioRecorder () { let fileMgr = FileManager.default let dirPaths = fileMgr.urls(for:.documentDirectory, in:.userDomainMask) let soundFileURL = dirPaths[0].appendingPathComponent("myaudio.caf") let

I am attempting to merge 2 WAV files, using an AVAssetExportSession, under iOS7. I've confirmed the files are there and don't seem to be corrupt or anything. These are WAV files that were taken from recordings done from the device itself, and they are relatively small files. When it calls the exportAsync method, it fails immediately with an "Operation Stopped" error immediately in the completion block (reason description is: "The operation is not supported for this media"). This happens in the simulator and the device itself. See below for my exporting code: NSError *avError = nil;