AddAlphaPlane

[hello_hello]

Maybe I'm missing something, but AddAlphaPlane() doesn't always seem to be accepting "last" as the first clip. It seems I can work around it by specifying the mask clip as a named argument, but is this apparent inconsistency expected? I'm running Avisynth+ 3.5 on XP.

No error

ConvertToYUV420()
AddAlphaPlane()
Alfa = ExtractA()
ConvertToYUV420().AddAlphaPlane(Alfa)

Results in a "greyscale source is not allowed" error

ConvertToYUV420()
AddAlphaPlane()
Alfa = ExtractA()
ConvertToYUV420()
AddAlphaPlane(Alfa)

Results in a "greyscale source is not allowed" error

ConvertToYUV420()
AddAlphaPlane()
Alfa = ExtractA()
Add = "AddAlphaPlane(Alfa)"
ConvertToYUV420().Eval(Add)

Results in a "greyscale source is not allowed" error

ConvertToYUV420()
AddAlphaPlane()
Alfa = ExtractA()
Add = "AddAlphaPlane(Alfa)"
ConvertToYUV420()
Eval(Add)

When using Mask=MaskClip, it never produces an error, but I'd be interested to know why only one of the examples above works as I expected it to.

This sort if thing never results in an error

ConvertToYUV420()
AddAlphaPlane()
Alfa = ExtractA()
Add = "AddAlphaPlane(Mask=Alfa)"
ConvertToYUV420()
Eval(Add)

Edit: While I'm here, could somebody please explain this one. I'm using the example from the wiki. Are these functions newer than version 3.5, or were they removed?

No such function as UToY8

Source = last.AddAlphaPlane()
U8 = source.UToY8()
V8 = source.VToY8()
Y8 = source.ConvertToY()
A8 = source.AddAlphaPlane(128).AToY8()
CombinePlanes(Y8, U8, V8, A8, planes="YUVA", source_planes="YYYY", 
\               sample_clip=source)

No such function as AToY8 (or ATtoY)

Source = last.AddAlphaPlane()
U8 = source.UToY.ConvertToY8()
V8 = source.VToY.ConvertToY8()
Y8 = source.ConvertToY()
A8 = source.AddAlphaPlane(128).AToY8()
CombinePlanes(Y8, U8, V8, A8, planes="YUVA", source_planes="YYYY", 
\               sample_clip=source)

No error

Source = last.AddAlphaPlane()
U8 = source.UToY.ConvertToY8()
V8 = source.VToY.ConvertToY8()
Y8 = source.ConvertToY()
A8 = source.AddAlphaPlane(128).ExtractA().ConvertToY8()
CombinePlanes(Y8, U8, V8, A8, planes="YUVA", source_planes="YYYY", 
\               sample_clip=source)

Cheers.

[real.finder]

there are bug in how last avs+ read the parameters https://forum.doom9.org/showpost.php...13&postcount=5 and https://forum.doom9.org/showpost.php...&postcount=622

[hello_hello]

It's an odd one.

Thanks.

[wonkey_monkey]

Also https://forum.doom9.org/showthread.p...18#post1920018

[real.finder]

ok, the OP seems not related with avs+ 3.6 problem, simply it not work because Mask is var so it not use the feeded clip unless it forced to do so

UToY8 was there from classic avs 2.6, but I think AToY8/AToY was in some avs+ test and removed later after ExtractA was added

[pinterf]

Originally Posted by hello_hello

Maybe I'm missing something, but AddAlphaPlane() doesn't always seem to be accepting "last" as the first clip. It seems I can work around it by specifying the mask clip as a named argument, but is this apparent inconsistency expected? I'm running Avisynth+ 3.5 on XP.

ConvertToYUV420()
AddAlphaPlane()
Alfa = ExtractA()
ConvertToYUV420()
AddAlphaPlane(Alfa)

Results in a "greyscale source is not allowed" error

The "mask" parameter is a named parameter and is optional.
http://avisynth.nl/index.php/Combine...#AddAlphaPlane

When you call AddAlphaPlane with a simple clip, it is a perfectly valid form of AddAlphaPlane with a single source clip parameter.

In this syntax the single nameless parameter you were given is the interpreted as a source clip. And this clip (Alfa at the moment) is not allowed to be greyscale.

AddAlphaPlane(mask=Alfa) will work, since the source will be "last".