Summer of 2025 swimming

No Indian summer this year — (Alt+0151) at least, that's my subjective impression. My swimming season started on June 1 and finished on September 22. I used to stretch it until November, but in the past few years, we haven't had a proper fall and have gone straight from summer to winter.

To sum it up:
18 × 0.5 km
51 × 2.5 km

... makes 136.5 km. That's 833.5 km since 2021. Looks like Greece next year.

Using FFmpeg to add audio to your video

I have decided to add some background music to my smartphone gameplay casts, and it turns out that it's easiest to do this with ffmpeg. It's just a two-step process:

1. Find out the video length.
   
   ffprobe -v error -show_entries format=duration -of default=noprint_wrappers=1:nokey=1 input.mp4
   
   
2. Add background music with a fade-out effect (starting two seconds before the video ends, D-2 should be the video length returned by the previous command, minus two seconds).
   
   ffmpeg -i input.mp4 -i input.mp3 -map 0:v -map 1:a -c:v copy -c:a aac -af "afade=t=out:st=D-2:d=2" -shortest output.mp4