2019-04-10 10:49:51.590008+0500 VTKaraokeView[869:1039603] *** Terminating app due to uncaught exception 'NSRangeException', reason: '*** -[__NSArray0 objectAtIndex:]: index 0 beyond bounds for empty NSArray'
Hi iOS Gurus! I'm merging Video & Audio files(.mp4 & .mp3 file)...
BACKGROUND & PROBLEM STATEMENT:-
As I'm working on an App like karaoke... I'm recording Video with Background Music and then AFTER MERGING this recorded video & background music into new newVideo.mp4 file and then Playing .newVideo.mp4 into AVPlayerViewController... As this works perfect BUT the problem is when my recorded video exceeds from almost 10 seconds then I'm getting this above exception. AND this exception occurs on this Line let aAudioOfVideoTrack : AVAssetTrack = aVideoAsset.tracks(withMediaType: AVMediaTypeAudio)[0]
func mergeFilesWithUrl(videoUrl: URL, audioUrl:URL)
{
let savePathUrl : NSURL = NSURL(fileURLWithPath: NSHomeDirectory() + "/Documents/newVideo.mp4")
do { // delete old video
try FileManager.default.removeItem(at: savePathUrl as URL)
} catch { print(error.localizedDescription) }
let mixComposition : AVMutableComposition = AVMutableComposition()
var mutableCompositionVideoTrack : [AVMutableCompositionTrack] = []
var mutableCompositionAudioTrack : [AVMutableCompositionTrack] = []
var mutableCompositionAudioOfVideoTrack : [AVMutableCompositionTrack] = []
let totalVideoCompositionInstruction : AVMutableVideoCompositionInstruction = AVMutableVideoCompositionInstruction()
//start merge
let aVideoAsset : AVAsset = AVAsset(url: videoUrl)
let aAudioAsset : AVAsset = AVAsset(url: audioUrl)
mutableCompositionVideoTrack.append(mixComposition.addMutableTrack(withMediaType: AVMediaTypeVideo, preferredTrackID: kCMPersistentTrackID_Invalid))
mutableCompositionAudioTrack.append(mixComposition.addMutableTrack(withMediaType: AVMediaTypeAudio, preferredTrackID: kCMPersistentTrackID_Invalid))
mutableCompositionAudioOfVideoTrack.append( mixComposition.addMutableTrack(withMediaType: AVMediaTypeAudio, preferredTrackID: kCMPersistentTrackID_Invalid))
let aAudioOfVideoTrack : AVAssetTrack = aVideoAsset.tracks(withMediaType: AVMediaTypeAudio)[0] // HERE i'm getting Error...Index Array Out Of Bound...
let aVideoAssetTrack : AVAssetTrack = aVideoAsset.tracks(withMediaType: AVMediaTypeVideo)[0]
let aAudioAssetTrack : AVAssetTrack = aAudioAsset.tracks(withMediaType: AVMediaTypeAudio)[0]
do{
try mutableCompositionAudioOfVideoTrack[0].insertTimeRange(CMTimeRangeMake(kCMTimeZero, aVideoAssetTrack.timeRange.duration), of: aAudioOfVideoTrack , at: kCMTimeZero)
try mutableCompositionVideoTrack[0].insertTimeRange(CMTimeRangeMake(kCMTimeZero, aVideoAssetTrack.timeRange.duration), of: aVideoAssetTrack, at: kCMTimeZero)
//In my case my audio file is longer then video file so i took videoAsset duration
//instead of audioAsset duration
try mutableCompositionAudioTrack[0].insertTimeRange(CMTimeRangeMake(kCMTimeZero, aVideoAssetTrack.timeRange.duration), of: aAudioAssetTrack, at: kCMTimeZero)
//Use this instead above line if your audiofile and video file's playing durations are same
// try mutableCompositionAudioTrack[0].insertTimeRange(CMTimeRangeMake(kCMTimeZero, aVideoAssetTrack.timeRange.duration), ofTrack: aAudioAssetTrack, atTime: kCMTimeZero)
}catch{
}
totalVideoCompositionInstruction.timeRange = CMTimeRangeMake(kCMTimeZero,aVideoAssetTrack.timeRange.duration )
let mutableVideoComposition : AVMutableVideoComposition = AVMutableVideoComposition()
mutableVideoComposition.frameDuration = CMTimeMake(1, 30)
mutableVideoComposition.renderSize = CGSize(width: 1280, height: 720)//CGSize(1280,720)
finalPath = savePathUrl.absoluteString
let assetExport: AVAssetExportSession = AVAssetExportSession(asset: mixComposition, presetName: AVAssetExportPresetHighestQuality)!
assetExport.outputFileType = AVFileTypeMPEG4
assetExport.outputURL = savePathUrl as URL
assetExport.shouldOptimizeForNetworkUse = true
assetExport.exportAsynchronously { () -> Void in
switch assetExport.status {
case AVAssetExportSessionStatus.completed:
print("success")
case AVAssetExportSessionStatus.failed:
print("failed \(assetExport.error)")
case AVAssetExportSessionStatus.cancelled:
print("cancelled \(assetExport.error)")
default:
print("complete")
}
}
}