@Stefano - Thanks for reaching out, and apologies that you’re having this issue.
When the Depthkit clip appears to be accelerated in a recording made with Unity Recorder, it usually means that the playback of the Depthkit video and Unity Recorder are not temporally locked - i.e. Depthkit is playing back faster than Unity Recorder is recording it.
To address this, we recommend leveraging the Depthkit Expansion Package’s Unity Timeline integration, then adding Unity Recorder to the project, and adding a Recorder Clip to the same timeline as the Depthkit Clip (see screenshot below). Using the Unity Timeline to drive both playback of Depthkit videos as well as the Unity Recorder will ensure that the captures are recorded in perfect lockstep.
It’s also worth noting that while the project pictured above is being run on an M3 MacBook Pro and rendering using Unity’s Built-in Render Pipeline and Unity Video Player, it uses Unity version 2022.3 and Depthkit’s Phase 10 packages. Is Unity 2020 a requirement? If not, I recommend upgrading to these versions, and letting us know if this resolves your issue.