Simple task? Shifting frames around

[ydobon]

Hi,

I'm interested in shifting some frames in a video a few pixels left or right. I've found the AddBorders+Crop trick (http://avisynth.org/mediawiki/AddBorders) but to apply it to just some frames I've only found ApplyRange and I can't/don't know how to apply both filters sequentially (and ApplyRange complains about resolution changes). :rolleyes:

I can only think in splitting the video in dozens of clips, shift each one around and re-join them. Is there a simpler way to do this? :confused:

I wish AddBorders would admit negative parameters. :D

[IanB]

Use Add mode with X and Y in Layer (YUY2, RGB32) or Overlay (YV12) to position the source clip over a blank clip at 100% opacity.

Use a function to group several statements for ApplyRange etc.

Look at JDL utils for more comprehensive range selection.

[ydobon]

First of all, thanks for your quick answer.

I've just got it working with Overlay (the video in question is YV12) once I was able to get past an "invalid parameters" error:
ApplyRange(black_bg,606,658,"Overlay",clip,-3,-1)

Now I have to try statement grouping to make it zoom in the overlayed clip. :p

Thanks again.

[DarkT]

I dunno, the way I'd go about it is Trim it, apply the modifications, and then combine back...

So like:

A = trim(0,50)
B = Trim(51,100).Crop(x).Addborders/Resize/whatever

C = A+B

Return C

It's prolly a noobish way of going about it, but anyway...

Edit:

A simpler way would be:

ReplaceFramesSimple(Trim(a,b,-c,-d),
\ mappings="[645 706] ")

It's one of StickyBoy's functions... This would apply the Trim to frames 645 to 706...


Naturally, keep the overall resolution the same, otherwise it won't let ya...

[midelic]

It looks like warpsharp(shodan version)shifts frames to the upper left side.
see:
That difference picture of WarpSharp is misleading. This particular Warpsharp version does something very strange: it shifts the whole frame to the upper-left. Check "interleave(clip,clip.WarpSharp())" to confirm. Therefore, those "big differences" you see are not caused by more sharpening; they are caused by the spatial shifting of WarpSharp.

http://forum.doom9.org/showthread.php?t=129818

[foxyshadis]

If you call one of the resizers like Resize(width,height,src_left=x,src_top=y,src_width=width,src_height=height) as seen in this thread (http://forum.doom9.org/showthread.php?t=127909), you get no complaints of frame size, and it works nicely in conditional. Mind IanB's warning, but I never found it to be very resource intensive.

[ydobon]

Thank you all for your help.

Once I've learned to use Overlay and ApplyRange, I've ended using it for everything :D
I've done what I wanted with the video (shifting several segments in one or two of the four directions and/or zooming in) with a couple of functions:
function ShiftFrames(clip clip, int "start", int "end", int "x", int "y") {
ApplyRange(clip, start, end, "Overlay", clip, x, y)
}
function Zoom(clip clip, int "start", int "end", int "zoom") {
zoomed = Lanczos4Resize(clip, 720+zoom*8, 576+zoom*6)
ApplyRange(clip, start, end, "Overlay", zoomed, -zoom*4, -zoom*3)
}
Once "fixed", the video has been cropped. That's why I didn't bother to use a blank clip in the overlay (which would have been a cleaner solution).

[stickboy]

I'm interested in shifting some frames in a video a few pixels left or right. I've found the AddBorders+Crop trick (http://avisynth.org/mediawiki/AddBorders) but to apply it to just some frames I've only found ApplyRange and I can't/don't know how to apply both filters sequentially (and ApplyRange complains about resolution changes).In general, if you want to apply multiple filters like that, you can create your own user-defined function that applies all of them, and then you pass your function to ApplyRange.

For example:

function Shift(clip c, ...)
{
return c.AddBorders(...).Crop(...)
}

AVISource("example.avi")
ApplyRange(100, 200, "Shift", ...)(I leave it as an exercise for the reader to fill in the "..." parts appropriately.)

[ydobon]

Thanks for the code example.