Issues getting a webm animation to play after setting it via the API?

So I've created a .webm animation, uploaded it to my library, and confirmed it works (when dragged-and-dropped to the sandbox).

I'd like to be able to control it via the API somehow.  The current method I'm using is:

1. Turn it off by setting the imgsrc to a blank png.
2. Turn it on by setting the imgsrc to the webm file, using the "https://s3.amazonaws.com/files.d20.io/imag..." filename from my library.

When I do this, only the very first frame of the animation appears; the animation doesn't start to play until I manually hit the Play button.

Is this the right way to do this, or is there another method that will give the same result?

I found an earlier reply that said using createObj was the only way to do it.  I tried that, with the following command:

... and I get "UNDEFINED".  For some reason, the object isn't being created. (I've tried it using both "med.webm" and "thumb.webm", neither of which work.)

Ey there!

I ran into this exact issue while trying to get some auto-switching animated character tokens working. (After asking here.)

The short answer is that this is a bug on Roll20's end, and there is absolutely nothing you can do from the back-end / API to fix it. (Creating a brand new object with createObj is one of the many, many things I tried.)

I would love to be proven wrong, so please let me know if you discover anything. Otherwise, I recommend bumping / +1'ing the bug report thread linked above, to bring some more attention to it.

I ended up "solving" the problem with a front-end hack (I injected javascript into my client that looks for the "stuck" tokens and toggles their pause/play commands), but this solution is unreliable, ugly, definitely not Roll20-approved, and shouldn't be necessary in the first place. It also means that it only works if the DM is willing to install a javascript injector and run injection code at all times, and if the DM can't see the tokens (for instance, if the players are on a different map, or if the DM is offline), they break. Not good.