Sequence FPS not set leads to "silently" failing video export

[ERROR:0] global C:\dev\vcpkg\buildtrees\opencv4\src\4.5.3-40390ee198.clean\modules\videoio\src\cap.cpp (589) cv::VideoWriter::open VIDEOIO(CV_MJPEG): raised OpenCV exception:

OpenCV(4.5.3) C:\dev\vcpkg\buildtrees\opencv4\src\4.5.3-40390ee198.clean\modules\videoio\src\cap_mjpeg_encoder.cpp:436: error: (-215:Assertion failed) fps >= 1 in function 'cv::mjpeg::MotionJpegWriter::open'

[main.cpp:178:main][info] Starting PeTrack
[main.cpp:179:main][info] Version: 0.10.4
[main.cpp:180:main][info] Commit id: CroMa-98-g5b8ea368-dirty
[main.cpp:181:main][info] Commit date: Fri Dec 9 08:58:46 2022
[main.cpp:182:main][info] Build from branch: 62-add-method-shoulder-detection-3
[main.cpp:183:main][info] Compile date: Wed Aug 14 16:28:45 2024