On 24-01-2021 10:44 pm, Wolfgang Hugemann wrote: >> Use -vsync 0. No addiitional frames should be added. > Well, this is true, but the video is switched to cfr. As I said, I tried > this too. And usin mkv or webm instead of mp4 make no difference. Why do you believe the result is CFR, or rather different than the source? Gyan