https://bugs.kde.org/show_bug.cgi?id=491257

--- Comment #8 from Jean-Baptiste Mardelle <j...@kdenlive.org> ---
Detection of VFR clips happens in MLT. Your clips doesn't pass a check
comparing FFmpeg's average and real frame rates on the video stream :
av_cmp_q(stream->avg_frame_rate, stream->r_frame_rate);
https://github.com/mltframework/mlt/blob/master/src/modules/avformat/producer_avformat.c#L1398

If you think this is incorrect, it means that there is a problem within this
check or in FFmpeg.
However there are several reports of GoPro producing VFR clips, and you can see
Dan's answer (the MLT maintainer)on this topic:
https://forum.shotcut.org/t/constant-frame-rate-video-incorrectly-determined-to-be-variable-frame-rate-in-20-11-29/25112/3

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