[vdr] Understanding AC-3

Rolf Ahrenberg rahrenbe at cc.hut.fi
Fri Sep 3 21:06:16 CEST 2010

On Fri, 3 Sep 2010, Rob Davis wrote:

> Do we need to check it's ATSC if type is 0x81? Does anything else use it and 
> is it a problem if it does?

The values 0x80-0xFF are so called User Private in the standard, so in 
theory you cannot assume them to be ATSC. But you could detect the ATSC 
streams from their registration descriptor (hopefully) and after that 
adapt dynamically to ATSC video and AC-3 pids.


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