On Wed, 2009-05-20 at 07:22 -0700, Jim Stichnoth wrote: > On Wed, May 20, 2009 at 4:27 AM, Andy Walls <[email protected]> wrote: > > Jim, > > > Before I go mucking around with the cx25840 driver, could you > run the > following steps to see if they make things better: > > > Hi Andy, > > > Thanks for the detailed instructions. It may take a couple of days > before I can try it out since it is the "production" machine.
Take your time. > This certainly sounds plausible as a way of explaining why a > different STB would make it stop working. It's one way for sure. I recall that you said the tuner and another box was working. Aside from analog signal processing, some other wild speculation I have is: 2. The STB isn't putting out the proper parity bits for the CC data. The cx25840 driver software will drop things on the floor with bad parity. A TV set might not care. 3. Maybe there's some funny new encoding of CC being output by the new STB that the cx25840 slicer isn't programmed to look for. 4. The CC data is on the wrong line from the STB. 5. The horizontal timings is the cx25840 driver are ever so slightly off off, but it shouldn't make a difference. Maybe for this STB, it actually does. I'll probably ask for some *raw* vbi data files of a few seconds each (check with osc that raw VBI is being captured and then kill osc and do a cat /dev/vbi > foo.vbi) for a known good source and then the STB source. Differential analysis of the raw VBI samples is the most deterministic way of figuring out what's going on. Regards, Andy _______________________________________________ ivtv-users mailing list [email protected] http://ivtvdriver.org/mailman/listinfo/ivtv-users
