Ac3 passthrough works with DVD but not Movies (1 Viewer)

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I have the same audio ouput specified for both DVD and Movies. I also tried the other audio options. I can't figure out why AC3 passthrough works with DVDs but not divx files with AC3. With divx I get PCM audio.

 

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I found another video with AC3 to try and worked fine. I guess some AC3 encodes are more suitable for passthrough than others.