Tagging an interval, making tags behave like tracked shapes?

[titarch]

My actions before raising this issue

• Read/searched the docs
• Searched past issues

Hello,

I am using Tags quite often for "image-wise attributes" to annotate properties of the frames, and I often need to tag intervals of hundreds of frames. While it is easy to propagate the tags, it is very inconvenient to manage them afterwards, like change when an interval starts and ends like I would do with a tracked shape, or worse when I try to delete the tag interval, I need to delete them one by one as they are all different objects.

I was wondering in that case if it would make sense and if it is possible to make the Tags behave exactly like tracks, thus making it easy to change start and end frames, as well as deleting the whole track.
Otherwise, could you think of any feature I might have missed that may make my work easier in those scenarios?
I am thinking I could maybe use a dummy rectangle track that I could consider like a tag and maybe selecting the whole frame in the rectangle but that would probably be a bit dirty and not very intuitive.

Thanks a lot for your help.

[bsekachev]

Something related with #4952

[titarch]

@bsekachev this issue is not quite the same, instead of a single tag for a whole video, this would allow to tag some interval of frames, it would behave exactly like tags except on a track to facilitate how it is managed.
TrackedTags would be to Tags what RectangleTracks are to RectangleShapes.

[bsekachev]

@titarch

I see. Something like ability to interpolate tags would be fine for this use-case.
Maybe with additional UI visualizations.

[titarch]

@bsekachev

Exactly, for now I am using a modified RectangleTrack to do this which changes the behaviour when the label is specifically named "imgattr", it automatically hides the rectangle and dumps as a tag in the XML. Not ideal but it does the job for now.

The way I use to vizualize them is using a timeline (see #5003) to display changes in the attributes of the "imgattr" label, segments are in between two "imgattr" keyframes and represent an unchanged attribute of the "imgattr" label and can be hovered to reveal information like this:

The timeline also shows normal rectangle tracks (the blue on the top left of the timeline is some, but this show the full label track instead of how its attributes are changing).

[NicDionne]

Hi @titarch, I'm looking for something similar. Is there any news on this?