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How to find the presence of an audio track

How do you know if an audio track is present in a video? I am using the AVUrlAsset class to load assets.

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if ([[asset tracksWithMediaType:AVMediaTypeAudio] count] > 0)
{
AVAssetTrack *sourceAudioTrack = [[asset tracksWithMediaType:AVMediaTypeAudio] objectAtIndex:0];
[trackB insertTimeRange:CMTimeRangeMake(kCMTimeZero, [asset duration]) ofTrack:sourceAudioTrack atTime:kCMTimeZero error:&error];
}


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