Rendering crashes due to animated object

[GaryB]

This seems to be the same issue I mentioned here:

Typewriter effect causes error message

I’m trying to use the typewriter effect in a title clip for the first time. When rendering, I get the following error: [mp4 @ 0000021c8564a040] Timestamps are unset in a packet for stream 1. This is deprecated and will stop working in the future. Fix your code to set the timestamps properly [mp4 @ 0000021c8564a040] Encoder did not produce proper pts, making some up. The resulting video seems to play OK, but it’s only a few stills with fades between them at the moment. If I turn the typewriter…