2018-04-28 19:24 GMT+02:00, wm4 <nfx...@googlemail.com>:
> If the API user doesn't set avg_frame_rate, matroskaenc will write the
> current timebase as "default duration" for the video track. This makes
> no sense, because the "default duration" implies the framerate of the
> video. Since the timebase is forced to 1/1000, this will make the
> resulting file claim 1000fps.
>
> Drop it and don't write the element. It's optional, so it's better not
> to write it if the framerate is unknown.

(Isn't it default frame duration?)

Please mention ticket #6386 if you commit.

Carl Eugen
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