cmegens
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Horizontal lines with video, not stills

Fri May 24, 2013 12:26 pm

With my camera module I get horizontal 'lines' on the video feed, both preview and resulting video files. It are not harsh lines, but more horizontal discoloration..

The weird thing is that when raspistill previews they are there, but the resulting jpg is perfect. Anyone else experiencing this? I can post a picture later...

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pluggy
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Re: Horizontal lines with video, not stills

Fri May 24, 2013 12:59 pm

You power supply might not be up to the mark, the camera consumes a lot of current, a power supply on the edge can work with stills, but not with video. Testing the voltage across TP1 and TP2 when the camera running is a start, but it doesn't tell the whole story.
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Re: Horizontal lines with video, not stills

Fri May 24, 2013 1:01 pm

cmegens wrote:With my camera module I get horizontal 'lines' on the video feed, both preview and resulting video files. It are not harsh lines, but more horizontal discoloration..

The weird thing is that when raspistill previews they are there, but the resulting jpg is perfect. Anyone else experiencing this? I can post a picture later...
Are you indoors with lights at 50Hz? Does the same happen with a outdoor scene?
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cmegens
Posts: 28
Joined: Fri May 24, 2013 12:23 pm
Location: Netherlands

Re: Horizontal lines with video, not stills

Fri May 24, 2013 7:24 pm

It's both out and indoors. I'll try my iPad charger then, it should provide enough power. My current supply is 850mA, so it should be fine, but who knows

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leol
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Re: Horizontal lines with video, not stills

Fri May 24, 2013 9:30 pm

If it is a model B then 850mA is not enough with the Camera. I think the Pi alone draws 700 mA and the camera another 200 mA when taking a picture.
cmegens wrote:It's both out and indoors. I'll try my iPad charger then, it should provide enough power. My current supply is 850mA, so it should be fine, but who knows

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jbeale
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Re: Horizontal lines with video, not stills

Fri May 24, 2013 9:33 pm

Which brings up the question of the polyfuse (F3) again. It is only rated for 700 mA (!) You can exceed that by small amounts and in short bursts, but the resistance will be gradually rising and the onboard voltage will be dropping over time, with sustained overload.

joshftx
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Re: Horizontal lines with video, not stills

Fri May 24, 2013 10:56 pm

There's a topic about this already on this forum. I had the same issue. i I tried every little USB-based charging brick, and USB cable I could find, and still had the problem. I finally fixed it by switching to a Motorola 850MA charger which had an integrated USB connector on the end. No need for separate USB cable with this one. This was the only way I was able to fix the problem. Other people seemed to have success simply using a shorter USB cable, and others had success switching their power supply. Good luck.

cmegens
Posts: 28
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Location: Netherlands

Re: Horizontal lines with video, not stills

Sun May 26, 2013 3:46 pm

The ipad charger works. Apparently the Raspberry Pi needs more power with the camera attached

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