I am able to do slow motion video using following command (found this at How to use slow motion effect in a specific time interval with ffmpeg):
ffmpeg -i input.mkv -filter_complex \ "[0:v]trim=0:10,setpts=PTS-STARTPTS[v1]; \ [0:v]trim=10:30,setpts=PTS-STARTPTS[v2]; \ [0:v]trim=start=30,setpts=PTS-STARTPTS[v3]; \ [v2]setpts=PTS/0.5[slowv]; \ [v1][slowv][v3]concat=n=3:v=1:a=0[out]" \ -map [out] output.mp4
but i also want to have same effect on audio such as that duration between 10-30 secs have slow motion audio else all other audio parts have normal speed.
Also the above command increase the video length, can some how it can be reduce to actual video length ?
Kindly someone help me out how to do this ?