DVD footage has scan lines

Posted by J.Corbett 
DVD footage has scan lines
January 28, 2009 04:58PM
I used Mpeg Clip Stream to get footage from a dvd. The footage has more clarity than my previous process. However, there is scan lines in motion areas of the video.

The footage is in game basketball highlights so there is a lot of motion. When viewing the footage is played on the dvd player thru RCA to A/V in on the cam it is not there, but ripped from a CD via the JPEG A format, it is almost too bad to use.

even on dvd i am sure the camera they used predates the dvx100. I almost looks like Hi-8.

Is there a better format to export from the MPEG Clip Stream?

Is there something that can be do in FCP to handle the scan-like look in the motion?

""" What you do with what you have, is more important than what you could do, with what you don't have."

> > > Knowledge + Action = Wisdom - J. Corbett 1992
""""
Re: DVD footage has scan lines
January 28, 2009 05:00PM
>Is there a better format to export from the MPEG Clip Stream?

Yes. Motion-Jpeg, DV, ProRes, Uncompressed, in reverse order of preference. And check if it was an interlaced source.

And what do you mean by "scan lines"?



www.strypesinpost.com
Re: DVD footage has scan lines
January 28, 2009 05:34PM
Quote

Is there something that can be do in FCP to handle the scan-like look in the motion?

No. There is nothing that can be do.

What you're seeing is not an artifact. It's the way interlaced video works. Fields are captured 1/60th of a second apart in time, which means if there's much horizontal motion, there will be a significant difference between the fields. This looks like what you call a "scan-like look" to you because you're not monitoring it correctly.

I'd swear we covered this just recently in this forum. Maybe I'm imagining it.

Re: DVD footage has scan lines
January 28, 2009 05:40PM
Jeff

scan-like look = banding or is there a better term.

""" What you do with what you have, is more important than what you could do, with what you don't have."

> > > Knowledge + Action = Wisdom - J. Corbett 1992
""""
Re: DVD footage has scan lines
January 28, 2009 05:40PM
Yikes. He's talking about those "scan lines"? I was thinking it was some kind of other artifact...

Yes, we covered that a lot. Or I could be imagining it too. It's a video format called "interlace". Check on a proper broadcast monitor.



www.strypesinpost.com
Re: DVD footage has scan lines
January 28, 2009 06:04PM
I was probably incorrect in thinking that I could monitor this on my cpu screen because it was going to the web. However, even on the monitor there are problems.

the motion looks jittery and i can almost see each frame. When the camera is moving (panning) the entire frame is jittery. When the camera is stationary the players look jittery.

I am going to try strypes suggestion of the uncompressed codec out.

""" What you do with what you have, is more important than what you could do, with what you don't have."

> > > Knowledge + Action = Wisdom - J. Corbett 1992
""""
Re: DVD footage has scan lines
January 28, 2009 10:05PM
Thanks Jeff and strypes.

I used the dvcpro50 codec coming out of mpeg clip stream(uncompressed) and that did the trick. Now its nice and clean playing in my TL.

BTW, You are right strypes it is much, much better and less time consuming than my LeRoy Hackins, Shadetree technique. drinking smiley

""" What you do with what you have, is more important than what you could do, with what you don't have."

> > > Knowledge + Action = Wisdom - J. Corbett 1992
""""
Re: DVD footage has scan lines
January 28, 2009 10:18PM
It may have been a field dominance issue... glad to hear you got it worked out though
Re: DVD footage has scan lines
January 28, 2009 11:21PM
That was my 1st thought but I have not seen enough cases to be sure if it was. When i start in the morning I will take the scan line clip and switch field dominance to see if that will work too.

""" What you do with what you have, is more important than what you could do, with what you don't have."

> > > Knowledge + Action = Wisdom - J. Corbett 1992
""""
Re: DVD footage has scan lines
January 29, 2009 12:45AM
You shouldn't be able to see inverted fields on a computer monitor.

On the other hand, most jpeg formats are designed to compress still pictures as opposed to interlaced formats, with the exception of Motion Jpeg.



www.strypesinpost.com
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