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this is the error :

Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
    at com.googlecode.mp4parser.boxes.mp4.ESDescriptorBox.getContentSize(ESDescriptorBox.java:60)
    at com.googlecode.mp4parser.AbstractBox.getSize(AbstractBox.java:203)
    at com.googlecode.mp4parser.BasicContainer.getContainerSize(BasicContainer.java:70)
    at com.coremedia.iso.boxes.sampleentry.AudioSampleEntry.getSize(AudioSampleEntry.java:330)
    at com.googlecode.mp4parser.BasicContainer.getContainerSize(BasicContainer.java:70)
    at com.coremedia.iso.boxes.SampleDescriptionBox.getSize(SampleDescriptionBox.java:112)
    at com.googlecode.mp4parser.AbstractContainerBox.getHeader(AbstractContainerBox.java:67)
    at com.coremedia.iso.boxes.SampleDescriptionBox.getBox(SampleDescriptionBox.java:94)
    at com.googlecode.mp4parser.authoring.tracks.AppendTrack.mergeStsds(AppendTrack.java:81)
    at com.googlecode.mp4parser.authoring.tracks.AppendTrack.<init>(AppendTrack.java:65)
    at Mp4.merging.merge(merging.java:97)

and This My Code :

 if (audioTracks.size() > 0) {
            result.addTrack(new AppendTrack(audioTracks.toArray(new Track[audioTracks.size()])));
        }

And I cant find the Null Element .

Bacteria
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user3108916
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  • possible duplicate of [What is a Null Pointer Exception, and how do I fix it?](http://stackoverflow.com/questions/218384/what-is-a-null-pointer-exception-and-how-do-i-fix-it) – Tunaki Aug 29 '15 at 16:45

1 Answers1

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the problem was in the vlc audio transcode , so the mp4 have a probleme with the sound track . i need to set audio encoding MP2L2 , but i dont khnow the correct VlC transcode options to make it work

user3108916
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