L'octidi 18 ventôse, an CCXXV, Calvin Walton a écrit : > Right now, the concat filter does not set the frame_rate value on any of > the out links. As a result, the default ffmpeg behaviour kicks in - to > copy the framerate from the first input to the outputs. > > If a later input is higher framerate, this results in dropped frames; if > a later input is lower framerate it might cause judder. > > The simplest fix is to just set the out links to have '1/0' as the frame > rate, the value meaning "unknown/vfr". Note that this changes the filter > chain to use AV_TB on the output rather than converting the timebase to > match the listed framerate. > > A test is added to verify the VFR behaviour. The change of output timebase > means the existing concat test needs to be updated with new pts values.
I do not think that setting it to 1/0 is the correct fix for this issue. Unless I am mistaken, the frame rate is available on all inputs when the corresponding code is called: I think the correct fix would be to check if all inputs have the same. Regards, -- Nicolas George
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