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Reduce artefacts after up-scaling of MPG-Movies
Hi guys,
I have a quite dirty problem here. I’m editing a music video for some students. They shot their main material of the band with a Sony PD170, a quite good DV-CAM (PAL). The shots are nice and clean.
But they also got some material of the location which they’ve shot with a digital photo-camera. These shots are 640*480 (square pixel) and MPEG-4 conmpressed. Usually I wouldn’t use the shots because I have to scale them up to fit the PAL Resolution of 720*576 (wide pixels) but I have to say that the shots are really great! They were shot outdoor with perfect weather (sun after raining) and have some great moments.
They don’t have time to shoot the material again so I have to get them into the final comp somehow.Here is one example of the outdoor clips (unedited):
http:/www.bootlegversion.de/dino/MOV00606.MPG (3MB)
So I took all these clips, ordered them into one timeline (Comp “MPEG”) in AE and then used the Comp “MPEG” in a comp “DV” where I scaled it up to fit the DV width and stretched it a bit more in height because of the squarepixel/widepixel transforming of the “DV” comp. Then I also speeded up the MPEG comp (from 10 minutes to 5 minutes –> 200% speed) because of the fast rhythm of the song (I don’t need the shots to be in real-time, they have to be faster).
But now I got extreme artefacts in the movie because of the up-scaling, the compression and the speed up.
How can I reduce the artefacts? Did I made it correctly? Would you prefer another technique to get the mpeg movies into the final comp?
Please help
Thank you very much!
Cletus -
5 Replies
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I don’t see any artifacts my self. I’d say keep the clip at 100%. Stretch it horizontally to fit the 720, but don’t scale it up. That’ll leave it letterboxed if that’s ok.
Other than that, how do you remove artifacts… blur. But then, it’s blurry. 😛 Maybe someone has a better idea for that.
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This clip I provided up there is directly from the camera and yes, the quality isnt that bad.
But after scaling it up and time stretching it (play at double speed)the compression artefacts are visible.Just try it yourself in AE. I don’t have a clue how to solve it, perhaps with blur and unsharp mask?
Thanks for the help anyway
Any other ideas?
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I was wondering the same thing this morning. What’s a free way to clean up atifacts?
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When you scale it up do it with – layer, transform, and fit to comp width. For the artifacts you could try the remove grain only on the blue channel. Or duplicate your footage and use the median effect with a low value on your top footage, and remove grain with the same settings on your second layer. Try the saturation blend mode (or others) on your top footage.
There are also other methods – and plugins, but they tend to cost “a leg and an arm”. If you have no budget limits, take a look at Algolith plugins – wich is specially designed to remove MPEG noise amongst others.regards
morebo
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