force audio alignment in mpv

explanation:

- vf=setpts=PTS/1 ensures that each frame is shown at its correct time according to the video’s original timing. It does not affect the overall playback speed dictated by the frame rate setting. ( i use 20 fps to avoid getting drowsy )

-  vf=setpts=PTS/1 is set to prevent issues like audio-video desynchronization or to ensure smooth playback, especially with variable frame rate (VFR) videos.

home-configuration/home-configuration.scm

@@ -234,6 +234,7 @@
                              ("ls" . "ls -p --color=auto")
 			     ("run_code" . "g++ -o main main.cc -Ofast -std=c++23 -s -flto -march=native -I ~/dev/ajatt/hakurei/include/  && ./main")
 			     ("rgf" . "rg --files | rg")
+			     ("mpv" . "mpv --audio-pitch-correction=yes --vf=setpts=PTS/1")
 	       		     ("record" . "ffmpeg -f x11grab -r 23 -s 1366x768 -i $DISPLAY -f pulse -i nui_mic_remap -filter_complex '[1:a]volume=2.0[a]' -map 0:v -map '[a]' -c:v libx264 -pix_fmt yuv420p -preset ultrafast -crf 23 -y /tmp/output.mp4")
                              ("isolate" . "guix shell --container --network --preserve='^DISPLAY$' \
 --preserve='^XAUTHORITY$' --expose=$XAUTHORITY --expose=/etc/ssl/certs --no-cwd ")))