Which 5.1 AC3 files (SurCode, Compressor, Audacity) will Encore Accept?

I have the SurCode plug in for Premiere and the stand-alone Compressor 4, and both will generate 5.1 AC-3 files that load perfectly into Encore and produce a 5.1 DVD or BD that decodes fine. I made a 5.1 AC-3 file using Audacity and FFmpeg which plays back via VLC correctly. However, when I try to import into Encore as an assest, I get this message:
Could not import file [filename.ac3]
More than two audio channels for this type of encoding is not supported.
Am I missing something? Is this a licensing issue? Reading older posts, it seems that Audacity-generated AC-3 files did once work. See here:  http://forums.adobe.com/thread/511930
Thank you for any help or suggestions.

tlipfert wrote:
I have the SurCode plug in for Premiere and the stand-alone Compressor 4, and both will generate 5.1 AC-3 files that load perfectly into Encore and produce a 5.1 DVD or BD that decodes fine. I made a 5.1 AC-3 file using Audacity and FFmpeg which plays back via VLC correctly. However, when I try to import into Encore as an assest, I get this message:
Could not import file [filename.ac3]
More than two audio channels for this type of encoding is not supported.
Am I missing something? Is this a licensing issue? Reading older posts, it seems that Audacity-generated AC-3 files did once work. See here:  http://forums.adobe.com/thread/511930
Thank you for any help or suggestions.
For starters, ffmpeg's implementation of AC3 is a reverse engineered hack, andf not guaranteed to be DVD spec compliant.
To be certain of getting properly compliant streams you must use a licensed encoder, and in 5.1 it must be a properly specified one from this list or else results cannot be guaranteed.

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