Sequence Recorder only captures movie as long as the actual frames go, not as long as my pc needs to buffer the video

Hey to all of you,

my problem is, that after finishing my sequence and trying to render it, the capture movie process only lasts as long as the sequence would (arround 30 seconds) and then it cuts to a random player view in the scene. The actual buffering of the scene lasts much longer and i only get arround 4 seconds of (good looking and perfectly smooth) footage out of it.
It seems the movie render process assumes my PC would render it in real time and only stays active for this amount of time. Any help? I deleted every other player or cam in the scene, but it still shows me some still image from the scene after these 30 seconds.

Thank you all for your time!!