How do I get the exact duration of a video file? Best would be of course if every frame is marked with its correct timestamp.

Why not use ffprobe?

|ffprobe -v error -show_entries format=duration -of default=noprint_wrappers=1:nokey=1 |./recordedVideo.webm

webm containers also store the duration of the streams in the stream metadata 
so you can also just query the duration tag.
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