[mythtv-users] anyone have AC3/DTS passthrough working with revo 1600?

Brian J. Murrell brian at interlinx.bc.ca
Wed Sep 1 12:42:11 UTC 2010

On Tue, 2010-06-08 at 13:04 -0400, Brian J. Murrell wrote: 
> Hi.
> I have a Revo 1600 connected via HDMI to my TV and while I get typical
> SD TV stereo sound to play (as PCM) I cannot get AC3/DTS passthrough to
> work.

To followup on this old thread, for the sake of anyone coming across it
in the future, I have resolved my issue and now have audio working as I
want it which is:

+------+          +----+                      +----------+
| Acer |---HDMI---| TV |---optical/toslink----| Receiver |
| Revo |          +----+                      +----------+

And receiving full Dolby Digital 5.1 (or 2.0 for content recorded from
digital cable, but it is DD and not PCM!) content on the Receiver.  I
have not (yet) been able to get DTS to pass through, but I've only had
the set a day and TBH, if I never got DTS to pass through and just ended
up re-encoding DTS to DD, I wouldn't shed a tear over it.  To me, (the
debates about DTS vs. DD aside) passing through DTS only provides the
benefit of not spending cycles re-encoding something I don't need to.

So in the end the entire problem was with the Samsung TV.  It just
refused to pass non-hdcp-protected DD through.

Conspiracy theorists would probably come up with some interesting
scenarios why this is, but I tend not to attribute to evil that which I
can attribute to laziness and incompetence.

I'd tend to think that Samsung simply doesn't acknowledge that AC3 can
actually come from a source that does not assert a "do not copy" HDCP
flag (and just block all AC3) on it and further, they fail to test that
use-case in their QA cycles.


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