Speed up the video and the audio of 10%, because I am bit slow:
ffmpeg -i 2019-02-17_19-01-22.flv -c:v libx264 -crf 20 -filter_complex "[0:v]setpts=0.9*PTS[v];[0:a]atempo=1.1111111111111112[a]" -map "[v]" -map "[a]" output.mp4
See How to speed up / slow down a video for more detailed information.
Basically, something to take care of is that:
audio-factor = 1 / video-factor