[FFmpeg-user] Speeding up a video fps rate with filters.

Bill Crockett wsc4 at optusnet.com.au
Thu Mar 22 12:39:26 EET 2018

I am speeding up a video fps rate to 24 fps.  The total # of frames must 
stay the same.  The audio must speed up also to keep sync.

ffmpeg -i input -r 24 -filter:v setpts=0.999*PTS output

Do I have to add these options to the audio?

-filter:a atempo=1.001

I thought just -r would be global and include the audio thus speeding it up. 
I do not put in "-filter:a atempo=1.001".   Am I correct? 

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