RenderAnim exports a sped up video

Hello. I’m trying to export a webm video on cables with the RenderAnim op.

I think there’s a bug the video that gets exported is a sped up version regardless of the set FPS.
I realised that the bigger the set export size / viewport, the faster the video is ‘sped up’ .

Could it be perhaps of hardware issues? I’ve used ffmpeg and ccapture.js with three.js in the past without similar issues tho.

I’m trying to export a FHD (1920x1080) video on my 15’ macbook.

you can try exporting a webm video with this test patch here:

I figured this is the same problem.

Using timelineTime seems to solve the export issues, but any idea how i achieve the same effect of slowing / speeding up a timer op ?