[gstreamer-bugs] [Bug 331588] Some realmedia files with a52 audio files embedded in doest work

[GStreamer (bugzilla.gnome.org)]

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 GStreamer | gst-plugins-ugly | Ver: HEAD CVS


Michael Smith changed:

           What    |Removed                     |Added
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                 CC|                            |msmith at fluendo.com




------- Comment #3 from Michael Smith  2006-02-24 13:22 UTC -------
The following is based on some testing with fluendo's AC3 decoder, but it
should be applicable to a52dec as well.

The data that comes out of the demuxer is clearly not raw AC3.
If you byteswap it (2 bytes at a time) it looks like AC3 frames superficially -
it contains the AC3 syncwords, and validates both AC3 CRCs (though it seems to
skip something about the length of an AC3 frame in between each AC3 frame that
it actually reads successfully - so maybe it's only getting half the data
anyway).

However, then, the AC3 frames have BSI > 8 (this is essentially the stream
version  - being > 8 indicates that it's an incompatible future version not
covered by the AC3 specification). 

If anyone wants to try doing the byteswapping trick with a52dec, maybe it
understands this bitstream revision?


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