no video: More questions on clear QAM / hauppaugh hvr-1600 - live tuning?

[JohnInSJ]

Ok, my previous thread is now resolved (http://forums.nextpvr.com/showthread.php?t=34943)

This is what I am worried about now.

System:

GBPVR Version: stock 1.2.9 gbpv + XRecord plugin
Capture device: Hauppauge HVR-1600 (74041)
CyberLink MPEG Muxer THMpgMux(5.0.0.2022).ax

Windows XP/SP2/current (32 bit version, 2 cpus detected)....
Shuttle xpc/Glamor core2 duo 2.4ghz 64 bit cpu, 2gb ram

Intel GMA 3100 (G33) chipset 256mb ram video, DVI out to LCD 1366x768 for display

Issue:
If I map the clear QAM channels (for example fox -> 2, CBS -> 5, etc, but only those checked, all others unchecked, in the QAM source) then when viewing live TV I only see the analog channels (2, 5, etc...)

If I *also* map the same clear QAM channels to higher numbers, like 702, 705, etc.. then when I channel up to them in Live TV, the first one tunes in in beautiful high def. The next one I get audio only, no video. Changing channel to any analog station gets the video back... going "backwards" off the other end of the analogs will make that last QAM channel tune in video + audio, but going previous from there also gives me audio with no video.

In other words, using Live TV, I cannot get it to tune to two successive QAM channels for video and audio - after the first one I just get audio.

Note that I get the IDENTICAL behavior when using the channel mapping thing setting up the source. The first channel I click shows vid + audio in the preview window, every other channel I select gives me a black screen and audio only.

I'm wondering if that will be a problem when recording QAM sources back to back, and I'd really like to be able to watch Live HD - I am sure I have something set up wrong. I don't seem to be generating any log files I can find. I've attached my settings.xml file

EDIT: WinTV can change QAM channels no problem at all...

Any Ideas?

[JohnInSJ]

Today is "answer your damn questions yourself" day.

Trying all the various mpeg decoders, I found that the one I was using (Intervideo nonCSS) didn't play well with 1080i content, or flipping between 1080i and 720p, or something. Tried one of the other ones, it did the trick on that... however I don't much care for the way any of the other mpeg decoders does deinterlacing of the analog streams. But that's a battle for another day.

Bottom line, everything seems to be working spiffy now except for the interlace artifacts, which I will work on some more but are not a GBPVR thing.

Thanks for following along as I drag myself up about 20 revs and three years in gbpvr/hardware technology

[JohnInSJ]

Just to close the loop on this one too... last night the new box successfully recorded two HD shows via the clear QAM channel, and also successfully recorded two shows at the same time (one via the analog side, the other HD via clear QAM)

At this point, I am a very happy camper.