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| s00pcan |
| Posted: Jun 17 2003, 10:39 PM |
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I hope this would be easy for someone here to make for me. When I captured video at full resolution from my playstation 2 then tried do slo-mo by de-interlacing I noticed that every fourth field is in the wrong spot. It's like playing the field backwards. So what I need is a filter that swaps the field dominance every third frame.
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| fccHandler |
| Posted: Jun 18 2003, 12:23 AM |
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Administrator n00b
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| QUOTE (s00pcan @ Jun 17 2003, 06:39 PM) | | So what I need is a filter that swaps the field dominance every third frame. |
I would try Avisynth with the following script:
| CODE | src = AVISource("drive:\path\filename.avi")
clip1 = SelectEvery(src, 3, 0)
clip2 = SelectEvery(src, 3, 1)
clip3 = SelectEvery(src, 3, 2).SwapFields()
Interleave(clip1, clip2, clip3) |
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May the FOURCC be with you... |
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| s00pcan |
| Posted: Jun 18 2003, 02:20 AM |
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Wait. I need it to swap fields on every even numbered frame. It sounds simple..
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| fccHandler |
| Posted: Jun 18 2003, 02:44 AM |
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Administrator n00b
Group: Moderators
Posts: 3961
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| QUOTE (s00pcan @ Jun 17 2003, 10:20 PM) | | how about separating the fields first then swapping every fourth/fifth frame? |
| CODE | AVISource("drive:\path\filename.avi")
SeparateFields()
SelectEvery(5, 0,1,2,4,3)
Weave() |
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May the FOURCC be with you... |
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| s00pcan |
| Posted: Jun 18 2003, 02:57 AM |
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scr = AVISource("clip.avi")
SelectOdd(scr).SwapFields()
separatefields
didn't work, but should have. I'll try your new code. |
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| fccHandler |
| Posted: Jun 18 2003, 03:21 AM |
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Administrator n00b
Group: Moderators
Posts: 3961
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| QUOTE (s00pcan @ Jun 17 2003, 10:20 PM) | | Wait. I need it to swap fields on every even numbered frame. It sounds simple.. |
Hey, you edited your post. That's not fair. 
| CODE | src = AVISource("drive:\path\filename.avi")
clip1 = SelectEven(src).SwapFields()
clip2 = SelectOdd(src)
Interleave(clip1, clip2) |
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May the FOURCC be with you... |
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| s00pcan |
| Posted: Jun 18 2003, 11:04 AM |
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Gah! That code makes complete sense but doesn't look any different than just separatefields by itself!
http://www.skateflint.com/slomo.avi
Here's an compressed clip so you can see what I mean. Using separatefields you can clearly see that problem. This should help.
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| fccHandler |
| Posted: Jun 18 2003, 03:24 PM |
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Administrator n00b
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I see. At times the motion appears backward, but it looks random to me. If there's no pattern to it then it's going to be really difficult to fix.
One question: Did you capture this at 29.97 fps originally? If not, then that could be the cause of the screwed-up field order.
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May the FOURCC be with you... |
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| s00pcan |
| Posted: Jun 18 2003, 04:55 PM |
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Well I captured it at 30fps.. I tried 29.97 and it still does it. |
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| fccHandler |
| Posted: Jun 18 2003, 06:01 PM |
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Administrator n00b
Group: Moderators
Posts: 3961
Member No.: 280
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Looking at your sample again, there is a pattern which kicks in after the 11th field. At that point (like you said), every fourth field is backwards. Try this:
| CODE | AVISource("drive:\path\filename.avi")
SeparateFields()
SelectEvery(4, 0,1,3,2) |
And ring all the changes for "SelectEvery" until it comes out right. If the pattern really is every fourth field, then there are 4 possibilities:
SelectEvery(4, 1,0,2,3)
SelectEvery(4, 0,2,1,3)
SelectEvery(4, 0,1,3,2)
SelectEvery(4, 3,1,2,0)
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May the FOURCC be with you... |
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| s00pcan |
| Posted: Jun 19 2003, 02:16 PM |
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SelectEvery(4, 1,0,2,3)
this works very well but then starts to mess up. I'm guessing there was a dropped frame or something that threw it off. I'll try capturing another clip.
http://www.skateflint.com/goodslomo.mpg
the filename speaks for itself.. thanks!
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