I'm trying to make a conversion for several mp4 video (from phone and cam) to webm.
The result is good for the quality sound and video.
But ... The result time of the video is ... foolish.
The mp4 is about 2 ou 3 minutes (depending of the video) but the result is 55m to more than 9 hours.
The video is, in fact, at the good length (the same than the original one) but the timer give a wrong (and random) duration. So it's impossible to go forward or backward.
The conversion was ok with a direct command (ffmpeg).
Here are capture (and sorry for my english), any suggestions ?