Blacking out frames

[AlanHK]

Is there a simple command to black out frames?
(I don't want to generate a black clip.)
Best I could come up with was:

Trim(0,52).AddBorders(0,Height,0,0).CropBottom(Height)++\
Trim(53,0)

[Alex_ander]

All I can suggest (not tested; FadeOut always adds an extra blank frame in the end):

Trim(0,51).FadeOut(1).FreezeFrame(0,52,52)++Trim(53,0)


P.S. Looks like the above will give a 2-frame audio glitch. Then one more trim is needed:
Trim(0,53).FadeOut(1).FreezeFrame(0,54,54).Trim(0,52)++Trim(53,0)

And finally, the shortest version (frame 0 can be also used for further blanking as source frame):
FadeIn(1).FreezeFrame(0,53,0)

[mikeytown2]

Try ReplaceFramesSimple
http://avisynth.org/stickboy/


ColorBars()
b=AddBorders(0,0,0,Width).Crop(0,Width,0,0)

ReplaceFramesSimple(last,b,mappings="[52 52]")



It's about as simple as it gets.

[Gavino]

I second mikeytown2's solution, which you can easily extend to black out additional frames (or frame ranges) just by extending the mappings string.

But I don't understand what you (AlanHK) have got against BlankClip. A simpler (and I would expect faster) solution would be

b=BlankClip(last)
ReplaceFramesSimple(last,b,mappings="[52 52]")

[IanB]

What's with the reluctance to use BlankClip, like ColorBars, it is a zero cost source filter. Provide it with a template clip and the parameters will identically match the template.

AddBorders(0,Height,0,0).CropBottom(Height) is not zero cost, it involves a full frame blit plus a full frame fill.

ColorBars()
B=BlankClip(Last, Color=$000000)

ReplaceFramesSimple(last, B, mappings="[0 52]")

Or

ColorBars()

BlankClip(Last, 1, Color=$000000) ++ Last # Add Frame 0 as Black frame

FreezeFrame(0+1, 52+1, 0) # Make frames 0 to 52 black

Trim(1, 0) # Restore original clip start

[Dreassica]

I always use a simple applyrange(0,52,"tweak",0,0,0,0)

[stickboy]

JDL_Blackout (http://avisynth.org/stickboy/) (although BlankClip + ReplaceFramesSimple also would work very nicely and would be more efficient if there are many disjoint segments that need to be blacked out).

[mikeytown2]

I think AlanHK (OP) wanted to keep the audio track, thats why he was against BlankClip(). ReplaceFramesSimple() doesn't touch the sound, and JDL_Blackout() with ApplyRange() doesn't create any new clips. Using Trim() would have messed up the audio.

[Gavino]

I think AlanHK (OP) wanted to keep the audio track, thats why he was against BlankClip().
A fair point, but it's a trivial matter to AudioDub the original soundtrack at the end of the filter chain (whichever way you do it), again at zero cost.