[Mono-bugs] [Bug 663861] New: new AVAssetReaderAudioMixOutput(songAsset.Tracks, null) throws exception

bugzilla_noreply at novell.com bugzilla_noreply at novell.com
Tue Jan 11 22:54:07 EST 2011



           Summary: new AVAssetReaderAudioMixOutput(songAsset.Tracks,
                    null) throws exception
    Classification: Mono
           Product: MonoTouch
           Version: SVN
          Platform: Other
        OS/Version: Other
            Status: NEW
          Severity: Critical
          Priority: P5 - None
         Component: Class Libraries
        AssignedTo: gnorton at novell.com
        ReportedBy: nikolai at eodsoft.com
         QAContact: mono-bugs at lists.ximian.com
          Found By: ---
           Blocker: ---

User-Agent:       Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.6; en-US;
rv: Gecko/20101203 Firefox/3.6.13

Exception says "Argument cannot be null".

The following fails too:

AVAssetReaderOutput assetReaderOutput = new
AVAssetReaderAudioMixOutput(songAsset.Tracks, new NSDictionary());

MonoTouchException: "Objective-C exception thrown.  Name:
NSInvalidArgumentException Reason: *** +[AVAudioOutputSettings
_outputSettingsWithOutputSettingsDictionary:exceptionReason:] invalid parameter
not satisfying: [outputSettingsDictionary count] > 0"

Reproducible: Always

Steps to Reproduce:
1. Compile and run:

            MPMediaItem curItem =

            NSUrl url =

            NSDictionary dict = new NSDictionary();
            AVUrlAsset songAsset = AVUrlAsset.FromUrl(assetUrl, dict);
            NSError error = new NSError(NSObjectFlag.Empty);
            AVAssetReader assetReader = AVAssetReader._FromAsset(songAsset,

            if (assetReader == null) 

            AVAssetReaderOutput assetReaderOutput = new
AVAssetReaderAudioMixOutput(songAsset.Tracks, null);

2. Exception thrown
Actual Results:  
Exception thrown

Expected Results:  
Should be supported as per iOS documentation:

The audio settings to be used for audio output; the dictionary must contain
values for keys in AVAudioSettings.h (linear PCM only).
Pass nil if you want to receive decoded samples in a convenient uncompressed
format, with properties determined according to the properties of the specified
audio tracks.

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