Editing each frame independently. Is it possible?

[Susana]

A have a video with variable letterbox, and I wanna use autocrop, resize and addborders (for a final 720x576 video frame size), but I need to do it frame by frame because of letterbox changes along the video (with autocrop producing different frame size in each frame). Is this possible, and how ?

Thank you.

[Boulder]

Richard Berg (IIRC) created a for-function which might be useful.

http://forum.doom9.org/showthread.php?t=106880

I have no idea how well it works in your case, it could be better to crop according to the largest letterbox area (or is the difference between them very big?).

[Susana]

thanks, i'll have a look.

Not very big, but the problem is image shifts between frames, maybe being due to irregular capture.
Exaggerating:

http://img209.imageshack.us/img209/5046/snap1lc1.gif

[Didée]

Get MVTools & MaskTools v2, and try s-th like

ref_frame = xxx # use position of this' frame borders throughout the clip

source = last
tall = source .BicubicResize(72,height,1,0) .mt_lut("x 18 < 16 235 ?")
tall_ref = tall .Trim(ref_frame,ref_frame) .Loop(framecount(source))
mixed1 = Interleave(tall_ref,tall)
mixed2 = Interleave(source,source)
vec = mixed1 .mvanalyse(truemotion=true,blksize=8,pel=2,isb=true,idx=98)

mixed2 .mvincrease(vec,10,1,idx=99) .SelectOdd()

Since it's a "drawn-on-paper" script only (can't try out now), chances are good that there's an error in the script. ;)

The idea is: leave borders black, make anything white that's brighter than a "black border", and then make a motion compensation of every single frame against one reference frame.

[Susana]

Well, I've been testing for-loop. Works well, but the max number of iterations is limited (around 1100) or the program crash (vdubmod), I don't know why so I've had to create a workaround (1000 frames in each iteration):

global clip_1=mpeg2source("C:\TEMP\D2VAVS\V01.D2V",idct=7)
global clip_2=clip_1.trim(0,-1)
global num=clip_1.framecount-1
global block="global clip_2=clip_2 + myfun(clip_1)"

#workaround (1000 iters each for-call)
(num>1000) ? for2("j=1","j<=1000","j=j+1",block) : For2("j=1","j<=num","j=j+1",block)
(num>2000) ? for2("j=1001", "j<=2000", "j=j+1", block) : ((num>1000) ? for2("j=1001", "j<=num", "j=j+1", block) : nop)
(num>3000) ? for2("j=2001", "j<=3000", "j=j+1", block) : ((num>2000) ? for2("j=2001", "j<=num", "j=j+1", block) : nop)
(num>4000) ? for2("j=3001", "j<=4000", "j=j+1", block) : ((num>3000) ? for2("j=3001", "j<=num", "j=j+1", block) : nop)
(num>5000) ? for2("j=4001", "j<=5000", "j=j+1", block) : ((num>4000) ? for2("j=4001", "j<=num", "j=j+1", block) : nop)
(num>6000) ? for2("j=5001", "j<=6000", "j=j+1", block) : ((num>5000) ? for2("j=5001", "j<=num", "j=j+1", block) : nop)
(num>7000) ? for2("j=6001", "j<=7000", "j=j+1", block) : ((num>6000) ? for2("j=6001", "j<=num", "j=j+1", block) : nop)
(num>8000) ? for2("j=7001", "j<=8000", "j=j+1", block) : ((num>7000) ? for2("j=7001", "j<=num", "j=j+1", block) : nop)
(num>9000) ? for2("j=8001", "j<=9000", "j=j+1", block) : ((num>8000) ? for2("j=8001", "j<=num", "j=j+1", block) : nop)
(num>10000) ? for2("j=9001", "j<=10000", "j=j+1", block) : ((num>9000) ? for2("j=9001", "j<=num", "j=j+1", block) : nop)
(num>11000) ? for2("j=10001", "j<=11000", "j=j+1", block) : ((num>10000) ? for2("j=10001", "j<=num", "j=j+1", block) : nop)
(num>12000) ? for2("j=11001", "j<=12000", "j=j+1", block) : ((num>11000) ? for2("j=11001", "j<=num", "j=j+1", block) : nop)
(num>13000) ? for2("j=12001", "j<=13000", "j=j+1", block) : ((num>12000) ? for2("j=12001", "j<=num", "j=j+1", block) : nop)
(num>14000) ? for2("j=13001", "j<=14000", "j=j+1", block) : ((num>13000) ? for2("j=13001", "j<=num", "j=j+1", block) : nop)
(num>15000) ? for2("j=14001", "j<=15000", "j=j+1", block) : ((num>14000) ? for2("j=14001", "j<=num", "j=j+1", block) : nop)
(num>16000) ? for2("j=15001", "j<=16000", "j=j+1", block) : ((num>15000) ? for2("j=15001", "j<=num", "j=j+1", block) : nop)
(num>17000) ? for2("j=16001", "j<=17000", "j=j+1", block) : ((num>16000) ? for2("j=16001", "j<=num", "j=j+1", block) : nop)
(num>18000) ? for2("j=17001", "j<=18000", "j=j+1", block) : ((num>17000) ? for2("j=17001", "j<=num", "j=j+1", block) : nop)
(num>19000) ? for2("j=18001", "j<=19000", "j=j+1", block) : ((num>18000) ? for2("j=18001", "j<=num", "j=j+1", block) : nop)
return clip_2


function For2(string init, string cond, string iter, string block)
{
For2Loop("global " + init, cond, "global " + iter, block)
}

function For2Loop(string init, string cond, string iter, string block)
{
Eval(init)
return Eval(cond)
\ ? Eval("""
Eval(block)
For2Loop(iter, cond, iter, block)
""")
\ : NOP
}

function myfun(clip clip_3)
{
#autocrop + 4/3 to 16/9 conversion
#only one frame each time
clip_3=autocrop(clip_1.trim(j,j),mode=0,threshold=25,wMultOf=2,hMultOf=2)
w=clip_3.width
h=clip_3.height
ar=w*(768/720)/h
wf=round(576*ar/(1024/720))
aux=(720-wf)/4
frac(aux)==0 ? eval("b=aux*2") : eval("b=aux*2-1")
frac(aux)==0 ? nop : eval("wf=wf+2")
clip_3=clip_3.LanczosResize(wf,576).AddBorders(b,0,b,0)
return clip_3
}


Anyway, this didn't solve my problem :o
I'll try Didée suggestion, thank you.