On Wednesday 28 September 2011, Devin Heitmueller <dheitmueller@xxxxxxxxxxxxxx> wrote: > Hi Simon, > > On Wed, Sep 28, 2011 at 8:50 AM, Simon Farnsworth > > <simon.farnsworth@xxxxxxxxxx> wrote: > > > > I'm having problems getting a Hauppauge HVR-1110 card to successfully > > tune PAL-D at 85.250 MHz vision frequency; by experimentation, I've > > determined that the tda18271 is tuning to a frequency 1.25 MHz lower > > than the vision frequency I've requested, so the following workaround > > "fixes" it for me. > > > > I'm going to run with this hack in place, but I'd appreciate it if > > someone who knew more about the TDA18271 looked at this, and either > > gave me a proper fix for testing, or confirmed that what I'm doing is > > right. > > Hi Simon, > > This is interesting. I did some testing with an 18271 based device a > few months back (a Hauppauge cx231xx based tuner), and I believe > PAL-DK was working (although I did have unrelated issues with the DIF > configuration). > > When you are doing the tuning request, are you explicitly stating > PAL-D in your calling application? Or are you passing "PAL" to the > V4L layer and expecting it to work with a PAL-D feed? > I'm noticing this problem because I fixed a bug of ours, where we were passing PAL to the V4L2 layer, and expecting it to work (video did, at the correct frequency, but audio did not, as the TDA18271 chose PAL-B). Having fixed the bug, I was having to either adjust my signal generator down by 1.25MHz, or adjust the frequency I passed to V4L2 up by 1.25MHz to make PAL-D work. Hence the hack - I've confirmed that with the hack in place, I can get colour video from the signal if I use PAL-B or PAL-D, and sound if I use PAL-D. Without the hack, I need to change the frequency as I toggle between PAL-B and PAL-D, or I lose video. -- Simon Farnsworth Software Engineer ONELAN Limited http://www.onelan.com/ -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
