The background story:I was having problems with audio on some pure QAM channels and ATSC channels included in the QAM stream. I checked with Taylor Jacob to see if he was seeing the same problems as I was since we're in the same area and hence are working off of the same cable feed. He suggested that I check to make sure that I was using the TS mode rather than PS. I actually thought that I had set TS mode, but it turned out that I hadn't. Once I switched over the audio worked peachily, but video didn't work at all on a couple of the channels. Further correspondence with him revealed that the problem was that the OpenCable standard identifies MPEG-2 video differently than the ATSC standard. With that fixed, everything works fine for me. Because of the known audio bug and also Taylor Jacob's statement to me that the TS code is in much better shape than the PS code, I suggested that the default be changed to TS rather than PS. So I've put together a patch. He's really the one responsible for the fix, I just did the actual code changing, which wasn't hardly anything in this case.
What the patch does:It adds 0x80 to the switch statement which causes MythTV to recognize streams coded 0x80 (as OpenCable does) as being MPEG-2 video when the transport stream option is turned on. It adds a very brief comment to the two options in the switch statement identifying which comes from ATSC and which from OpenCable. It changes the default setting upon database creation or upgrade to have the use TS option be set on by default.
What the patch does not do:It -does not- update the database version or elsewise force an upgrade, so it will not change new DVB cards inserted into an existing system. The change is not a significant change to the database schema, and it seems a bit much to force an upgrade simply for this single change. The change will be implemented on existing systems whenever the next database version increment occurs. It -does not- change existing user settings from PS mode to TS mode ever. It -does not- disable PS mode in any way, just turns it off by default for new cards.
Hopefully this will help make QAM channels a tiny bit easier for at least some new users.
Keith Irwin
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