[ tvtime-Bugs-977211 ] Random horizontal lines

Bugs item #977211, was opened at 2004-06-22 00:13
Message generated for change (Comment added) made by vektor
You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=506987&aid=977211&group_id=64301

Category: Output driver problems
Group: Open bugs in CVS tvtime
Status: Open
Resolution: None
Priority: 5
Submitted By: greg bell (gbell12)
Assigned to: Billy Biggs (vektor)
Summary: Random horizontal lines

Initial Comment:

I get random horizontal lines, >1 pixel wide when
viewing TV (coax).  Almost looks like static, except
Xawtv doesn't show it.  They're very fast.  I'm not
sure, but I think they may not always go all the way
across.

Oddly, I can't screen-capture the problem using
ImageMagick's "import" command - the resulting capture
is crystal clear.

Not sure what else to say since the output from -v is
so complete:

vtime -v
Running tvtime 0.9.12.
Reading configuration from /etc/tvtime/tvtime.xml
Reading configuration from /root/.tvtime/tvtime.xml
cpuinfo: CPU Pentium II (Klamath), family 6, model 3,
stepping 4.
cpuinfo: CPU measured at 307.895MHz.
xcommon: Display :0.0, vendor The XFree86 Project, Inc,
XFree86 4.3.0
xfullscreen: Using XINERAMA for dual-head information.
xfullscreen: Pixels are square.
xfullscreen: Number of displays is 2.
xfullscreen: Head 0 at 0,0 with size 1024x768.
xfullscreen: Head 1 at 0,0 with size 640x480.
xcommon: Have XTest, will use it to ping the screensaver.
xcommon: Pixel aspect ratio 1:1.
xcommon: Window manager is Xfwm4 and is EWMH compliant.
xcommon: Using EWMH state fullscreen property.
xcommon: Using EWMH state above property.
xcommon: Using EWMH state below property.
xcommon: Pixel aspect ratio 1:1.
xcommon: Displaying in a 768x576 window inside 768x576
space.
xvoutput: Using XVIDEO adaptor 106: NV05 Video Blitter.
speedycode: Using MMX optimized functions.
station: Reading stationlist from
/root/.tvtime/stationlist.xml
videoinput: Using video4linux driver 'BT878(Hauppauge
(bt878))'.
videoinput: Card type is eb, audio 1.
videoinput: Tuner Television (NTSC), flags: PAL NTSC SECAM 
videoinput: Audio supports Mutable 
videoinput: Brightness 24445, hue 24445, colour 30573,
contrast 32310
videoinput: Whiteness 0, depth 16, palette 7.
videoinput: Tuner Television (NTSC), flags: PAL NTSC SECAM 
tvtime: Sampling input at 720 pixels per scanline.
deinterlace: BlurVertical disabled: required CPU
accelleration features unavailable.
deinterlace: AdaptiveSearch disabled: required CPU
accelleration features unavailable.
deinterlace: AdaptiveAdvanced disabled: required CPU
accelleration features unavailable.
deinterlace: AdaptiveSimple disabled: required CPU
accelleration features unavailable.
xcommon: Pixel aspect ratio 1:1.
xcommon: Displaying in a 768x576 window inside 768x576
space.

xcommon: Received a map, marking window as visible (77).


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>Comment By: Billy Biggs (vektor)
Date: 2004-06-22 11:31

Message:
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It will look junky because we're drawing onto an image half
the size.  We could try to render the text better, but it's
tricky.  I think there is a bug open about this already.

----------------------------------------------------------------------

Comment By: greg bell (gbell12)
Date: 2004-06-22 11:06

Message:
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>1. Switch to the 'half resolution' deinterlacer, this will
>cut the data rate in half.

just this step made the effect go away.  thanks for the
quick response guys.  do you expect the OSD text to get all
grungy at half resolution deinterlacing?

if so, issue can be closed.  thanks again for the help and
quick response.

~gb

----------------------------------------------------------------------

Comment By: Billy Biggs (vektor)
Date: 2004-06-22 10:30

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tvtime is really targeted at a faster box.  In our default
configuration we capture over 20 megabytes per second of
data from your capture card versus probably less than 2
megabytes per second that streamer would be using.  We send
by default over 40 megabytes per second to your video card!

Do this in tvtime:
1. Switch to the 'half resolution' deinterlacer, this will
cut the data rate in half.
2. Switch the 'output framerate' to half rate, this will
again cut the data rate in half.
3. Switch the 'input width' setting to about 352 pixels per
scanline, this will again cut the data rate in half.

With that, you should have something about the same quality
as streamer/mplayer, and using about the same amount of
bandwidth.

----------------------------------------------------------------------

Comment By: greg bell (gbell12)
Date: 2004-06-22 10:25

Message:
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Its an old PII/333 (as the -v output shows) with an NVidia
GeForce 2 MX100 video card.  I can't remember if its AGP but
I think it is.

I'd be embarrassed about even trying anything video related
with this setup except that with linux's efficiency, this
thing has been a TiVo box for over a year - recording TV
(streamer) and playing it back (mplayer) with no problem.

Any tvtime setting I should try to reduce PCI bus bandwidth?


----------------------------------------------------------------------

Comment By: Billy Biggs (vektor)
Date: 2004-06-22 09:18

Message:
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Random horizontal lines usually means that too much data is
being sent over your PCI bus for your system to handle.

Do you have a PCI video card?  This might be one reason. 
tvtime sends more data than a PCI video card can handle.

Please describe your hardware configuration.

----------------------------------------------------------------------

You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=506987&aid=977211&group_id=64301


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