[mythtv-users] black stripes with hauppauge 250

Milan Andric mio at lebox.org
Tue Oct 5 16:02:20 UTC 2004

On Tue, Oct 05, 2004 at 02:44:11AM -0400, Michael T. Dean wrote:
> On 10/05/2004 12:56 AM, Milan Andric wrote:
> >Hello, I have been unable to make black vertical lines 
> >disappear from my video using the hauppauge 250 after following
> >jarod's guide.  I set this up a few weeks ago when the guide
> >had just recently updated to mythtv 0.16 and FC2. 
> >I tried using differnet interlacing algorithms 
> >but that didn't change much.
> >
> >i'm not sure where to start fixing, or peice of the puzzle is
> >most likely the problem.  any advice is appreciated.
> >
> >here's a picture of the WinTV PVR 250 card:
> >http://www.lebox.org/node/view/592
> >
> >output from cat /dev/video0 :
> >http://www.lebox.org/u/milan/tmp/m.mpg
> > 
> >
> I played back the MPEG file and didn't see anything abnormal.  If the 
> black vertical lines that concern you are the ones on the far left and 
> right of the image, there's no need for concern.  Analog television is 
> transmitted with "ragged" edges that are meant to be cut off by 
> "overscanning" the image (i.e. draw the top, bottom, left, and right 
> beyond the visible portion of the screen).  Therefore, just adjust your 
> overscan settings (for your TV output *and* for MythTV) to get the 
> perfect picture.  For example, with the settings I'm using (that just 
> overscan enough to get rid of the ragged edges), I get about 1/2" (on my 
> 27" TV) more picture on each edge of the screen than I do with the input 
> going directly to my TV--meaning my TV (like most) is way too agressive 
> at overscanning.  Just one more benefit of MythTV--the ability to 
> control the amount of overscan.
> If there are other black vertical lines, it probably has something to do 
> with your video output.  Try playing the video back on a different 
> computer using MPlayer or xine (or even Windows Media Player).

yep. it's my video output. i'm using an old ATI AIW Pro card that i'm
waiting for support from the gatos project for tv-out. ;\
so for now i'm just using my computer as a tv/monitor. well, I should
have tested the mpg on another computer. sure enough, it's an artifact
of playing mpg's on my computer, their are black contours lines, particularly
vertical on the pvr 250 mpg's. seems like an artifact of compression or mpg
library?  avi's look normal.  i'm still wondering where the problem is or 
which bits might be at fault. 

> BTW, it's good to see you've nearly got your box built.  :)

heh. yeah, it was fairly straightforward. i'm also trying to make use
of an old vid card (ATI AIW Pro, 3D Rage Pro), usually Mach64 driver 
on linux. so this is likely a fedora/ati driver problem ...  

is your advice to scrap the old video card and get a matrox440? i remember
an old mail where you have a specific recommendation.  I guess it wouldn't
be too bad of an investment, but i already (over)spent $140 on the hauppauge.
i was taking the frugal but rocky path; it fits my philosophy.

> >relevant lines from /etc/modules.conf:
> >
> ># ivtv modules setup
> >alias char-major-81 videodev
> >alias char-major-81-0 ivtv
> > 
> >
> These are good.
> >install ivtv /sbin/modprobe msp3400 saa7115 tuner v4l1-compat; 
> >/sbin/modprobe --ignore-install ivtv
> >#options ivtv ivtv_debug=1 tuner=2 cardtype=1
> >options ivtv ivtv_debug=1 tuner=39 cardtype=1
> >#trying
> >options tuner type=39
> >options msp3400 once=0 simpler=1 simple=0
> > 
> >
> All of these should be deleted.  All the appropriate information is 
> autodetected.  Jarod has updated his guide with better capture card 
> configuration information, so check the page again.


> >alias char-major-61 lirc_i2c
> >install lirc_i2c /sbin/modprobe ivtv; /sbin/modprobe --ignore-install 
> >lirc_i2c
> > 
> >
> These are OK, too.
> >ivtv driver versions:
> >
> >$ rpm -qa |grep ivtv
> >kernel-module-ivtv-2.6.8-1.521-0.1.10-45_pre2_ck108k.rhfc2.at
> >ivtv-0.1.10-45_pre2_ck108k.rhfc2.at
> >perl-Video-ivtv-0.12-5.1.rhfc2.at
> >ivtv-firmware-2.02.023-3.at
> > 
> >
> You might want to try the ck100zz rpm from ATrpms.  It will probably be 
> more stable for you.

ok, i'll have to trace back the steps to figure out how to get the ck100zz.

Thank again!


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