On Tue, 2009-07-28 at 14:30 -0400, Tom Ryan wrote: > My answers are below.. > > > On 7/23/09 8:28 PM, "Andy Walls" <[email protected]> wrote: > > On Thu, 2009-07-23 at 17:19 -0400, Tom Ryan wrote: > > Well, it worked good for a day and then started sync issues > again. We > > have narrowed the issue down to the particular device > connected to the > > analog composite input (a sony SSC-DC374 camera). If we > connect a vcr > > or a sony handycam to the cable, all is perfect. If we > connect a tv > > (instead of the card) to the cable, the output from the SSC > is > > perfect. > > > > The camera has an AGC (automatic gain correction) as well as > a level > > adjustment. We have tried adjusting them to various levels > and > > settings to no avail. (We have not worked the full gamut > though :) > > > > Any ideas, an option to the module load, etc that we're > missing??? > > 1. What card are you using? > 2. What driver version are you using? > > Driver name : cx18 > Card type : Hauppauge HVR-1600 > Bus info : PCI:0000:01:08.0 > Driver version: 66048 > > > 3. How did you "up the gain on the cards" before? > > -c cx23418 -s 0x104 0x1
Hmm. I think you meant "-c cx23418_843", otherwise nothing should have happened. > 4. What is the output of v4l2-ctl -d /dev/videoN --log-status > when you > don't have horizontal lock and when you do? > > no change > > 5. Do you have an oscilliscope to look at the video signal > coming out > from the SSC-DC374 to compare it with a known working video > signal? > (It'll take the guessing out of troubleshooting) > > I do not. The patch didn’t help.. Hmmm. So much for adaptive gain adjustment via heuristics. I have added a user control to the cx18 driver in a patch here: http://linuxtv.org/hg/~awalls/v4l-dvb/ http://linuxtv.org/hg/~awalls/v4l-dvb/rev/2ef91a4f42a9 With the patched driver, turning on the extra +12dB of gain should be as simple as this: $ v4l2-ctl -i2 $ v4l2-ctl -L $ v4l2-ctl -c extra_12db_gain=1 This control only boosts Luma (Y) and Chroma (C, Pb, Pr) signals and not the tuner SIF audio. It will re-adjust on input switches between Tuner, CVBS, and SVideo to keep boosting (or not) the Luma and Chroma signals for the new input configuration. > in case this helps > > I found a user with the similar issue with another hauppauge card. > > http://www.videohelp.com/forum/archive/hsync-issue-on-composite-capture-pvr500-t334215.html?layout=0&layoutalign=Center I find it surprising a PVR-xxx board had this problem. > ??????? > > Should I just get new cameras? Are there ones that people know will > work??? :) It may be cheaper to by a video signal amp/restorer for the camera. (An RF modulator from baseband up to channel 3 might work too.) The camera must have either a weak signal, large DC offset, or a really weird output impeadence. Hopefully the patch will give you the signal quality needed for horizontal locking, so no new hardware is necessary. Regards, Andy > Thanks! > > Tom _______________________________________________ ivtv-users mailing list [email protected] http://ivtvdriver.org/mailman/listinfo/ivtv-users
