NextLevelSessionExporter.NextLevelSessionExporterError error 3.

[vanniktech]

I'm on an iPhone 16 Pro Simulator with iOS 18.2 and none of the following three videos that I've attached can be compressed.

https://github.com/user-attachments/assets/2daa82bf-423a-4305-ae79-93f4b3d77b34
https://github.com/user-attachments/assets/aaff7392-9560-4463-8dee-74d2c53064fb
https://github.com/user-attachments/assets/70bbf4df-efbe-48cf-8193-e336bfbe478b

This is my swift code:

let exporter = NextLevelSessionExporter(withAsset: AVAsset.init(url: URL(fileURLWithPath: fileHandler.absolutePath(path: source))))
exporter.outputFileType = mimeType.avFileType()
exporter.outputURL = URL(fileURLWithPath: fileHandler.absolutePath(path: target))
exporter.audioOutputConfiguration = [
    AVFormatIDKey: kAudioFormatMPEG4AAC,
    AVEncoderBitRateKey: Int(audioBitRate),
    AVNumberOfChannelsKey: 2,
    AVSampleRateKey: NSNumber(value: Float(audioSampleRate))
]

exporter.videoOutputConfiguration = [
    AVVideoCodecKey: AVVideoCodecType.h264,
    AVVideoWidthKey: Int(size.width),
    AVVideoHeightKey: Int(size.height),
    AVVideoScalingModeKey: AVVideoScalingModeResizeAspectFill,
    AVVideoCompressionPropertiesKey: [
        AVVideoAverageBitRateKey: NSNumber(value: videoBitRate),
        AVVideoProfileLevelKey: AVVideoProfileLevelH264HighAutoLevel as String,
    ] as [String : Any]
]

exporter.export(...)

The update from 0.4.6 to 0.4.7 with #51 helped in some cases, but there are still some that are not working.

[vanniktech]

All of those videos have an audio bit rate which is smaller than 64000. I read the actual value and then pass it as part of:

AVEncoderBitRateKey: Int(audioBitRate),

That seems to be the culprit. I can fix this by doing max(64000, Int(audioBitRate)), then I can compress all of these videos. Still, I feel like the library should not fail when I pass in the audioBitRate from a video that I obtained using:

videoAsset.loadTracks(withMediaType: .audio) { [weak self] (audioTracks, error) in
  let audioTrack = audioTracks?.first
  let audioBitRate = Int32(round(audioTrack.estimatedDataRate))
}