Some Depthkit Combined Per Pixel Videos may freeze when playing back. We are investigating this issue, and believe the issue only occurs when using Nvidia driver version 572.16 or newer. More info may be available in the Nvidia developer forums: MP4 Playback Freezing with Nvidia Driver 572.16+ (Depthkit Exported Videos) - Drivers - Linux, Windows, MacOS - NVIDIA Developer Forums
To workaround this issue, roll your GPU driver back to version 553.62 and re-export the video.