mp4 sound export fails on Lion

Hello,

When I do export from procedure on Lion I get no sound.
I am not sure if this is my bug or a QT bug. I have seen similar  
reports on the internet.
I tried to make a test project using  
MovieExportNewGetDataAndPropertiesProcs but that turned out to work  
correctly.

In my log I see the following statements:

[MES_ExportVideoPropertyProc calls]

2:56:28 PM - main -        MES main  1321             
MES_ExportSoundPropertyProc
2:56:28 PM - main -        MES main  1324                propertyType  
= hrau
2:56:28 PM - main -        MES main  1335                returning true
2:56:28 PM - main -        MES main  1321             
MES_ExportSoundPropertyProc
2:56:28 PM - main -        MES main  1324                propertyType  
= ucfg
2:56:28 PM - main -        MES main  1331                returning true
2:56:28 PM - main -        MES main  1321             
MES_ExportSoundPropertyProc
2:56:28 PM - main -        MES main  1324                propertyType  
= osbd
2:56:28 PM - main -        MES main  1347                use  
configured, returning paramErr
2:56:28 PM - main -        MES main  1321             
MES_ExportSoundPropertyProc
2:56:28 PM - main -        MES main  1324                propertyType  
= qlty
2:56:28 PM - main -        MES main  1347                use  
configured, returning paramErr
2:56:28 PM - main -        MES main  1321             
MES_ExportSoundPropertyProc
2:56:28 PM - main -        MES main  1324                propertyType  
= clsz
2:56:28 PM - main -        MES main  1347                use  
configured, returning paramErr
2:56:28 PM - main -        MES main  1321             
MES_ExportSoundPropertyProc
2:56:28 PM - main -        MES main  1324                propertyType  
= cdst
2:56:28 PM - main -        MES main  1347                use  
configured, returning paramErr
2:56:28 PM - main -        MES main  1321             
MES_ExportSoundPropertyProc
2:56:28 PM - main -        MES main  1324                propertyType  
= dura
2:56:28 PM - main -        MES main  1398                time scale  
32000, lo duration 326720

2:56:28 PM - main -        MES main  1154             
MES_ExportVideoDataProc
2:56:28 PM - main -        MES main  1179                requestedTime  
= 0, requestedDuration = 0
2:56:28 PM - main -        MES main  1267                 
videoMediaTime = 0, num input frames = 1, input duration = 100

[more MES_ExportVideoDataProc calls]

2:56:28 PM - main -        MES main  1432             
MES_ExportSoundDataProc
2:56:28 PM - main -        MES main  1442                requestedTime  
= 0, requestedSampleCount = 0
2:56:28 PM - main -        MES main  1493                maxSoundTime  
= 10.11, actSmplCnt = 323526
2:56:28 PM - main -        MES main  1514                requestedTime  
= 0, soundBufferStartTime = 0, samplesInBuffer = 0
2:56:28 PM - main -        MES main  1540                 
savedSoundBuffer = 0x19a26000, savedReqCnt = 196608, numPackets = 196608
2:56:28 PM - main -        MES main  1546                reqCnt = 0,  
flags = 0
2:56:28 PM - main -        MES main  1554                 
samplesInBuffer = 196608
2:56:28 PM - main -        MES main  1583                Sound time =  
0, sample count = 32000
2:56:28 PM - main -        MES main  1321             
MES_ExportSoundPropertyProc
2:56:28 PM - main -        MES main  1324                propertyType  
= cdst
2:56:28 PM - main -        MES main  1347                use  
configured, returning paramErr

Note the repeated call to MES_ExportSoundPropertyProc for propertyType  
= cdst

On Lion MES_ExportSoundDataProc is never called!

Can anybody explain this?
Can export silently fail if the exporter doesn't like the settings?

TIA,

Jan E.
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