FFMPEG change the framerate but keep the same duration

[marcorocchini]

Hi cats,

please consider C0003.MXF have a framerate different from 25fps

ffmpeg.exe -r 25 -i C0003.MXF -vcodec mpeg2video -g 0 -intra -pix_fmt yuv422p -q:v 0 -flags +ildct+ilme -an output25fps.mkv

I need to change the framerate so that the final framerate is 25fps but also keep the same duration of the original C0003.MXF file, how can I do? thanks

[marcorocchini]

I have try also

-framerate 25

but ffmpeg returns "Option framerate not found" (and is the latest version of ffmpeg)

[mulvya]

-r 25 goes as an output option so after -i. Drop the framerate flag.

[marcorocchini]

ffmpeg.exe -i C0003.MXF  -r 25 -vcodec mpeg2video -g 0 -intra -pix_fmt yuv422p -q:v 0 -flags +ildct+ilme -an output25fps.mkv

thanks now the duration is the same but video is jerky: maybe don't do the frame interpolation?
in this case what should I do?