merge and sequence multiple Lottie animation into single animation

[anilsoniaurionpro]

Overview

Allow to merge or sequence several Lottie animations into single animation (JSON).
Allow to dynamically create animation from other animations.
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Type

• New feature
• Changes to existing features

Motivation

What inspired this feature request? What problems were you facing, or what else makes you think this should be
included?
I am trying to create animation dynamically from existing animations and then export it as video on the frontend only. Right now, I have an internal file format that specifies the sequence, and the whole of exporting it to video is not fast as I've to deal with a sequence in the video too. A single Lottie is easy to deal with.
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[github-actions]

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[did]

👋@anilsoniaurionpro, I've got the exact same need for my current project. Did you make it somehow and if not, do you have any hints? Thanks for your help!

[anilsoniaurionpro]

👋@anilsoniaurionpro, I've got the exact same need for my current project. Did you make it somehow and if not, do you have any hints? Thanks for your help!

I didn't find any lib to do this. I ended up understanding enough lottie json schema to dynamically merge multiple animations (in js).
In my case, I exported Lottie json with a specific structure and special settings in bodymovin like preserving ids etc to achieve this in easy manner.

[did]

thanks @anilsoniaurionpro. I managed to merge my 2 lottie files (same width / height / frames) by doing the same stuff as you did. It wasn't that hard actually, the only "issue" was to rename the refID in the Precomposition layers using some assets.

[anilsoniaurionpro]

thanks @anilsoniaurionpro. I managed to merge my 2 lottie files (same width / height / frames) by doing the same stuff as you did. It wasn't that hard actually, the only "issue" was to rename the refID in the Precomposition layers using some assets.

Before merging I did string replacement . Like jsonStr.replaceAll("comp1", nanoid()). do this for comp0 ... to comp20. Assuming there are max of 21 comps. Same for assets.

[anilsoniaurionpro]

I created a method that took a lottie json and returns a new lottie json (which merges all the layers into a precomp first).
this process involved string replacement to solve refID , assetId issues and moving all the layers to assets.
so the layer contains only a single layer which is the comp. this makes it easy to adjust timings.

After this multiple json are merged in single one.
this includes merging all layers , assets , fonts, markers , chars etc.

[github-actions]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed in 7 days if no further activity occurs.