[FFmpeg-user] Why the fps of concatenate video file change with old video file?

cuizhe cuizhe960307 at hotmail.com
Thu Jun 23 11:12:07 CEST 2016

I have two wmv video file which 25fps.
I concatenate these video file using ffmpeg command line like this:

>ffmpeg -r 25 -f concat -i 1.txt -c copy output.wmv

file g:\1.wmv
file g:\2.wmv

It works. But the fps of output.wmv is 30.
How can I maintain the fps of concatenate video file?

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