iOS Convert AVI to MP4

(Please note I've already looked at this other SO post.)
The Problem
I'm trying to convert an avi video to an mp4 so that I can play it natively on an iOS app using Objective-C
What I've Tried
I'm trying the following code to do that conversion:

- (void)convertVideoToLowQuailtyWithInputURL:(NSURL*)inputURL outputURL:(NSURL*)outputURL handler:(
void (^)(AVAssetExportSession*))handler {
    [[NSFileManager defaultManager] removeItemAtURL:outputURL error:nil];
    AVURLAsset *asset = [AVURLAsset URLAssetWithURL:inputURL options:nil];
    AVAssetExportSession *exportSession = [[AVAssetExportSession alloc] initWithAsset:asset 
presetName:AVAssetExportPresetHighestQuality];
    exportSession.outputURL = outputURL;
    exportSession.outputFileType = AVFileTypeMPEG4;
    [exportSession exportAsynchronouslyWithCompletionHandler:^(void) {
        handler(exportSession);
    }];
}

The error that is returned from the exportSession is Cannot Open
Extra Information
When I run the video that I'm trying to convert through Mediainfo I get the following for the video:
7 332kb/s, 1920*1080 (16:9), at 25.000 FPS, AVC (Baseline@L3.1) (CABAC / 1 Ref Frames)
And this for the audio:
128 kb/s, 8 000 Hz, 16 bits, 1 channel, PCM (Little / Signed)
I also used the exportPresetsCompatibleWithAsset: method on AVAssetExportSession and got the following results:

AVAssetExportPreset1920x1080,
AVAssetExportPresetLowQuality,
AVAssetExportPresetAppleM4A,
AVAssetExportPresetHEVCHighestQuality,
AVAssetExportPreset640x480,
AVAssetExportPreset3840x2160,
AVAssetExportPresetHEVC3840x2160,
AVAssetExportPresetHighestQuality,
AVAssetExportPreset1280x720,
AVAssetExportPresetMediumQuality,
AVAssetExportPreset960x540,
AVAssetExportPresetHEVC1920x1080

Another thing to note is that when playing with the preset and the output I managed to get an audio only file that was basically white noise. This was using the preset AVAssetExportPresetAppleM4A.
I hope that I've jotted down enough information.


from iOS Convert AVI to MP4