Setting custom prop to Sequences

Archive Python API
1

So I try this code, create an property:

bpy.types.Sequences.fakeinput1 = bpy.props.PointerProperty(name="Input 1", type=bpy.types.Sequences)

Then draw it in panel:

col.prop(strip, "fakeinput1")

And I get following error:

rna_uiItemR: property not found: ImageSequence.fakeinput1

So I guess, ImageSequence does not inherits my property from Sequences

But when I try to set this property to ImageSequence I get following error:

TypeError: PointerProperty(...) expected an RNA type derived from ID or ID Property Group
Traceback (most recent call last):
  File "----", line 10, in <module>
  File "----", line 11, in StripSettings
ValueError: bpy_struct "ImageSequence" registration error: fakeinput1 could not register

I tried to make pointer on PropertyGroup, this works for Sequences, but for ImageSequence I got this error:

`TypeError: PointerProperty(...) expected an RNA type, failed with: RuntimeError: , missing bl_rna attribute from 'RNAMetaPropGroup' instance (may not be registered`)

How can I fix that? Maybe I can mark property as inherited?

For now I get this results:

  • Pointer for PropertyGroup or Sequences(ImageSequence) - works in Sequences (but not inherits), does not work in ImageSequence
  • BoolProperty or any simple Property - works in Sequences (but not inherits), work in ImageSequence also

This is a testscript works fine for 3 prop and get error on prop4, why?

import bpy

class MyAddonProperties(bpy.types.PropertyGroup):
    input1 : bpy.props.IntProperty()

class StripSettings(bpy.types.PropertyGroup):
    bpy.types.Sequences.prop1 = bpy.props.BoolProperty(name='Active', default=True)
    bpy.types.ImageSequence.prop2 = bpy.props.BoolProperty(name='Active', default=True)
    bpy.types.Sequences.prop3 = bpy.props.PointerProperty(type=MyAddonProperties)
    bpy.types.ImageSequence.prop4 = bpy.props.PointerProperty(type=MyAddonProperties)

bpy.utils.register_class(MyAddonProperties)
bpy.utils.register_class(StripSettings)
1 Like
2

I found you need to register this variable against the scene, not just inside the python script, so something like this, I define this in the init file for the add-on:

Scene.pdt_delta_x = FloatProperty(name='X Coord', default=0.0,
                                               precision=5,
                                               description="X Coord Delta", unit='LENGTH')

This is done in the register() method, and I delete any of these in the unregister() method.

Then you need to define scene in your draw() method:

def draw(self, context):
    layout = self.layout
    scene = context.scene

Then you can draw the variable:

row.prop(scene, 'pdt_delta_x', text = 'X')

Hope this helps, I struggled with this also…

Cheers, Clock.

3

I don’t need property in scene, I need props in sequencer strips, to store data in each individual strip

4

So, my property; bpy.context.scene.pdt_delta_x does not exist anywhere else after I have declared it? Maybe even bpy.context does not exist in NLA editor? Curious…

You’ll understand if I decline to offer any further help…

BTW it exists in Python Console:

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Screen Shot 2019-09-20 at 18.02.54.png301×530 17.2 KB

5

You should not need to register a property to the ImageSequence type, it is a subtype of Sequence and all registered properties should carry over.
In my addon, I have registered several properties to sequences and they apply to image sequences as well.

bpy.types.Sequence.parent = bpy.props.StringProperty()

Does result in bpy.types.ImageSequence having the ‘parent’ property.

The main issue i see with your code is the first line where you do:

bpy.types.Sequences.fakeinput1 = bpy.props.PointerProperty(name="Input 1", type=bpy.types.Sequences)

You cannot set the property type to bpy.types.Sequences, you can only set it to something that is in bpy.props, or a subclass of one of those.

6

Thanks, I replaced Sequences to Sequence and now it works!

But I still can’t add PointerProperty to Sequence.

You say

You cannot set the property type to bpy.types.Sequences, you can only set it to something that is in bpy.props, or a subclass of one of those

But i can actually set PointerProperty to Scene, so this works:

bpy.types.Sequence.scene = bpy.props.PointerProperty(type=bpy.types.Scene)

But this does not:

bpy.types.Sequence.seq = bpy.props.PointerProperty(type=bpy.types.Sequence)
7

oh, sorry, i didnt notice that you started with bpy.types.Sequences… thats definitely incorrect, but I had actually been referring to the ‘type=’ variable setting.

However, it looks like this is SORTOF possible in 2.79+ (I didnt know about this), however it isnt very well documented, and it only works with ‘data-block like objects’ (what that means, I dont really know), as the documentation states:
“Custom properties can now store pointers to data-blocks like objects, materials, etc. For this the a PointerProperty with a datablock type can be created.”

So, my guess is that the ‘scene’ is a datablock type object… and sequence isnt? I guess?
Really, the PointerProperty is designed for PropertyGroup based classes, essentially letting you create a dictionary.
For instance, I used it in my addon to store the settings and temp variables in one variable, something like:

class VSEQFSetting(bpy.types.PropertyGroup):
    last_frame: bpy.props.IntProperty()

bpy.types.Scene.vseqf = bpy.props.PointerProperty(type=VSEQFSetting)

bpy.context.scene.vseqf.last_frame = 100

Anyway… since blender is really bad about giving us options to store references to the actual data, what I ended up doing in my addons is storing the data name as a reference… its not ideal since that name can change at any time, but its really the only option for that as far as I know.

8

Ok, now I understand the problem: I can’t make PointerProperty(type=bpy.types.Sequence) Any walkaround?

9

if you need the blender property special abilities, your only option is to store the sequence name and grab the sequence with that. of course, you can store the sequence in a non-blender variable, even a global var, but that wont be saved in the blend file.