On Mon, 2009-02-16 at 15:04 -0500, WSD33904 wrote: > Andy: > > >I'm not quite sure what you mean by "dropshadow" but it sounds like a > >strong signal reflection somewhere in your cabling. Color in NTSC is > >determined by the timing of the signal relative to the color carrier > >phase (IIRC). A delayed copy of the signal would explain an off-color > >copy as a shadow. > > > Here is a link that has an example of the image quality problems that > I am experiencing. You responded to my question in issue 9 of the IVTV > mail list (February 13th) > > http://www.mythtvtalk.com/forum/ivtv-issues/10841-pvr-150-mythtv-capture-quality-issues-picture-included.html#post44262
Well the failure mode looks somewhat obvious: the digitizer (like at CX25843) is not getting set up right or it's being reverted to the autoconfig defaults-. All the analog front end gain adjustment and analog to digital conversion happens at the digitizer chip. The black with white pixels lines at the top are Vertical Blanking Interval test signals and data services (like Closed Captioning). Either the digitizer isn't detecting vertical sync properly or the digitizer register for the number of lines of vertical blanking isn't being filled properly. The digitizer has other filters and gain controls that can be applied to an analog signal. I2C bus errors/failures could cause registers in the sigitizer not to be programmed properly. When the machine is realtively quiescent, kill the mythbackend, use modprobe -r ivtv cx25840 to unload ivtv and the cx28540 (or whatever digitizer you have) modules. Then modprobe ivtv and see if things are better. Regards, Andy > If anyone has any comments, please do not hesitate to express it! > > Regards, > Maury > > _______________________________________________ > ivtv-users mailing list > [email protected] > http://ivtvdriver.org/mailman/listinfo/ivtv-users > _______________________________________________ ivtv-users mailing list [email protected] http://ivtvdriver.org/mailman/listinfo/ivtv-users
