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Line 43 of offset.py makes the software complain and print the ffmpeg output if the fps is given in a format different than 00.00. For example, my videos' fps are given as 12 and 24 fps (without decimals) and thus the program complains and the output is unecessarily large.
A solution would be to change the regular expression to '(\d+(.\d+)?)\sfps' instead.
However, if I do so, another problem arises. It happens that my videos have different fps. I don't mind about that because I'm only using the program to calculate the offset (option -coo). However, as verification of whether videos have the same fps is done in offset.py (line 216) which is run when option -coo is enabled, the program fails.
I imagine this should be verified within the run_sync function (line 57, app.py) instead, but I didn't want to try anything because I'm not familiar with this. Anyway, I couldn't find anywhere in the code where the fps are actually used.