Surfaced by a user in this [forum post|https://forum.unity.com/threads/recorder-ffmpeg-encoder-will-stop-working-if-there-is-any-kind-of-fps-hiccup-rendering-it-dead.1394821/]

Reproduction Steps:
- Set up a movie recorder with an ffmpeg encoder
- Start the recording
- Notice the speed at which the recorder writes frames
- Press pause in the game view for about a second, then play
- Notice that the recorder is now super slow

More debug info can be found on the post