Archived from groups: rec.video.desktop (
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"John McAuther" <macaa456@hotmail.com> wrote in message
news:40930848$0$32558$afc38c87@news.optusnet.com.au...
> I have exactly the same problem. I have an idea as to why that works in
> practice but doesn't in theory so I'm stumped but I guess if it works it
> doesn't matter. I find that if I hold the camera still and take a photo
with
> it or hold it very still and video with it the image doesn't shake but if
I
> push the photo button and then keep walking it will shake. My camera Sony
> TRV16 doesn't have a memory card so photos are just recorded onto the
tape.
> When I edited the first few times I just used the avi and didn't export a
> frame of the photo to a picture format such a bmp. When thinking about why
> the images jump on TV I thought I'd found a way around it by exporting the
> frame to a bmp. In theory that should be perfectly still because it is an
> image but it doesn't work for some reason. I find the only way around it
is
> to hold the camera as still as possible for the duration of the shot. If
> someone has a different method I'd be great to know.
>
>
> "Mike" <carpets@hotmail.com> wrote in message
> news:4092db09$0$31688$fa0fcedb@lovejoy.zen.co.uk...
> > Hello there.
> > I've been trying to create the effect of a video pausing when I'm
editing.
> > I've done this by exporting the frame I want the film to stop at, as a
> still
> > bmp image and then importing it into the timeline. This looks fine on
the
> > preview but when the film is rendered, sometimes the still image shakes.
> Can
> > anyone tell me why this should be and if there is someway to stop this?
> > Thanks.
> >
Hello. I think I've found out why some still frame shake.
I don't fully understand it but it's caused by interlacing. DV cameras take
a series of frames, but each frame is only made up of half the pixels
available. So one frame will be made up of odd numbered lines, the next of
even, the next of odd etc. If there is movement between successive frames,
there will be horizontal lines on the frame. When a frame like this is
exported as a still image and then inserted back into the video in a video
editing program the computer/camera interprets the lines as motion (i think)
and hence the image is not still when you view it. It shakes.
To stop this you 'deinterlace' the frame. This remove the horizontal lines
by blurring them. Some video editing applications have this option and
photograph editing programs have it in the 'remove noise' filters. You need
to deinterlace the shaky frame, then reinsert the new deinterlaced image
back into your video project.
>
>
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