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Is there a way to access the avcC atom when reading a file that originated from iTunes with the mp4parser library for java? I've done this manually using the pasp atom in some custom code, but after switching to this library I lost access to the data.

Known paths for the avcC atom:

  • /moov/trak/mdia/minf/stbl/stsd/avc1/avcC
  • /moov/trak/mdia/minf/stbl/stsd/avc1/pasp/avcC
  • /moov/trak/mdia/minf/stbl/stsd/drmi/avcC

MP4Parser https://github.com/sannies/mp4parser

Sebastian Annies
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Paul Gregoire
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1 Answers1

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The avcC atom of a valid quicktime file can never be inside the pasp atom. The avcC atom can be next to the pasp, but it cannot be IN the pasp as the pasp box doesn't contain other boxes. You can use the Path class for easy access (it knows some regexp):

public static void main(String[] args) throws IOException {
    IsoFile isoFile = new IsoFile("video.mp4");
    AvcConfigurationBox avcC = Path.getPath(isoFile, "/moov/trak/mdia/minf/stbl/stsd/.../avcC");
}

of all AVC configuration boxes regardless their parent box.

Sebastian Annies
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  • I hope you're right, it's certainly possible that our previous custom mp4 reader may have had a bug but it certainly thought avcC was pasp child. – Paul Gregoire Feb 01 '13 at 14:29
  • How do i get the avcDecoderConfiguration from the avcC parent? – Paul Gregoire Feb 02 '13 at 20:59
  • Also tried this path and got an error: Exception decoding header / atoms java.lang.RuntimeException: ... is invalid path. – Paul Gregoire Feb 02 '13 at 21:05
  • I also tried using four dots and get this: java.lang.ClassCastException: com.coremedia.iso.boxes.UnknownBox cannot be cast to com.coremedia.iso.boxes.ContainerBox – Paul Gregoire Feb 03 '13 at 18:03